Articoli di riviste: "JSCC"

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Song, Mengshu, Nan Ma, Chen Dong, Xiaodong Xu e Ping Zhang. "Deep Joint Source-Channel Coding for Wireless Image Transmission with Adaptive Models". Electronics 12, n. 22 (13 novembre 2023): 4637. http://dx.doi.org/10.3390/electronics12224637.

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The implementation of joint source-channel coding (JSCC) schemes using deep learning has accelerated the development of semantic communication research. Existing JSCC schemes based on deep learning (DL) are trained on a fixed signal-to-noise ratio (SNR); however, these trained models are not designed for scenarios in which the SNR is dynamic. Therefore, a novel semantic adaptive model for semantic communication—called joint source-channel coding with adaptive models (AMJSCC)—that has a semantic adaptive model selection (SAMS) module is proposed. The joint source-channel encoding (JSCE) model and the joint source-channel decoding (JSCD) model adapt according to both real-time channel conditions and system available computational power resources. Furthermore, residual networks with different layers are investigated to further improve the accuracy of information recovery. Simulation results demonstrate that our model can achieve higher recovery similarity and is more robust and adaptive to the SNR and communication resources. Meanwhile, compared to the state-of-the-art deep JSCC methods, it reduces storage space and communication resource consumption.

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Hata, Akihisa, Noboru Fujitani, Masahiro Takeshita, Chie Tanaka, Noriko Matsuda, Michiko Takaishi, Takako Shimokawa Miyama e Fumio Hoshi. "Comparison of regression for blood ALP levels using methods of the Japan Society of Clinical Chemistry and the International Federation of Clinical Chemistry and Laboratory Medicine in bovine, canine, feline, and human testing". PLOS ONE 16, n. 6 (16 giugno 2021): e0253396. http://dx.doi.org/10.1371/journal.pone.0253396.

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Livestock and companion animal health have a direct impact on human health. Research on clinical laboratory technology for veterinary medicine is as important as that on human laboratory technology. Reagents and analysis equipment for human medical laboratory tests are often used in veterinary medicine. Medical laboratories in Japan utilize the Japan Society of Clinical Chemistry (JSCC) method for blood alkaline phosphatase (ALP) analysis. The International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) method is used worldwide for ALP catalytic concentration measurement. When the IFCC method is used, human blood ALP activity is approximately one-third of the JSCC method’s activity. The JSCC method for ALP measurement was switched to the IFCC method in medical laboratories in Japan in April 2020 for global standardization purpose. It is uncertain whether conventional JSCC method reagents will continue to be supplied. In veterinary medicine, the relationship between the JSCC and IFCC methods in terms of ALP measurement is almost unclear. This study investigated the regression between JSCC and IFCC methods measuring ALP in bovine, canine, feline, and human. The regression formulas for bovine, canine, feline, and human ALP values using the conventional JSCC (x) and IFCC (y) methods are y = 0.379x + 0.124, y = 0.289x + 8.291, y = 0.358x + 0.432, and y = 0.337x + 2.959, respectively. These results suggested that the IFCC method measurement could be estimated by approximately one-third of the JSCC method measurement in animal species such as bovine, canine, and feline. By applying the conversion factors proposed in this study, a very good correlation could be obtained between the two methods for each animal.

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Yoshizawa, Akihiko, Kenzo Hiroshima, Akemi Takenaka, Reiji Haba, Kunimitsu Kawahara, Yuko Minami, Hirokuni Kakinuma et al. "Cytology Reporting System for Lung Cancer from the Japan Lung Cancer Society and the Japanese Society of Clinical Cytology: An Extensive Study Containing More Benign Lesions". Acta Cytologica 66, n. 2 (6 dicembre 2021): 124–33. http://dx.doi.org/10.1159/000520426.

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Introduction: The Japan Lung Cancer Society (JLCS) and the Japanese Society of Clinical Cytology (JSCC) have proposed a new four-tiered cytology reporting system for lung carcinoma (JLCS-JSCC system). Prior to the proposal, the Papanicolaou Society of Cytopathology (PSC) had proposed a revised reporting system (PSC system), which comprises the “neoplastic, benign neoplasm, and low-grade carcinoma” category (N-B-LG category), in addition to the 4 categories of the JLCS-JSCC system. This study aimed to evaluate the interobserver agreement of the JLCS-JSCC system with an additional dataset with more benign lesions in comparison with the PSC system. Methods: We analyzed 167 cytological samples, which included 17 benign lesions, obtained from the respiratory system. Seven observers classified these cases into each category by reviewing one Papanicolaou-stained slide per case according to the JLCS-JSCC system and PSC system. Results: The interobserver agreement was moderate in the JLCS-JSCC (k = 0.499) and PSC (k = 0.485) systems. Of the 167 samples, 17 samples were benign lesions: 7 pulmonary hamartomas, 5 sclerosing pneumocytomas, 2 squamous papillomas, one solitary fibrous tumor, one meningioma, and one lymphocytic proliferation. There were diverse sample types as follows: 11 touch smears, 3 brushing smears, 2 aspirations, and one sputum sample. Fourteen samples (82.3%) were categorized into “negative” or “atypical” by more than half of the observers in the JLCS-JSCC system. Conversely, 3 samples were categorized as “suspicious” or “malignant” by more than half of the observers in the JLCS-JSCC system. On the other hand, 11 samples (64.7%) were categorized into the N-B-LG category by more than half of the observers in the PSC system. Conclusions: The concordance rate in the JLCS-JSCC system was slightly higher than that in the PSC system; however, the interobserver agreement was moderate in both the JLCS-JSCC and PSC systems. These results indicate that both the JLCS-JSCC and PSC systems are clinically useful. Therefore, both systems are expected to have clinical applications. It may be important to integrate the 2 systems and construct a universal system that can be used more widely in clinical practice.

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Furumoto, Kayo, Noboru Fujitani, Masakatsu Nohara e Akihisa Hata. "Comparison of Analytical Values after Changing to the International Standardized Method for Lactate Dehydrogenase and Alkaline Phosphatase Measurements in Mouse and Rat". Veterinary Sciences 9, n. 11 (27 ottobre 2022): 595. http://dx.doi.org/10.3390/vetsci9110595.

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Since April 2020, the method for lactate dehydrogenase (LD) and alkaline phosphatase (ALP) activity measurements in Japan has been switched from the Japan Society of Clinical Chemistry (JSCC) reference method, which is only used in Japan, to the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) reference method. However, in some species, the relationship between the blood values of both enzymes measured by the two methods remains unclear. Hence, values measured by these two methods cannot be used interchangeably. Therefore, this relationship was examined in ICR mice and Wistar/ST rats. The LD and ALP values obtained by both methods were plotted on scatter graphs, and regression equations were obtained. To compare the JSCC (x) and IFCC (y) methods, regression equations were generated for LD values in non-hemolytic samples as follows: y = 0.954x − 4.008 for ICR mice and y = 0.963x − 6.324 for Wistar/ST rats. The conversion factors from the JSCC to the IFCC methods were 0.954 (mice) and 0.963 (rats). The conversion coefficients from the IFCC to the JSCC methods were 1.048 (mice) and 1.088 (rats). For ALP values in fasted mouse and rat samples, the regression equations were y = 0.336x − 2.247 and y = 0.314x − 17.626, respectively. The conversion factors from the JSCC to the IFCC methods were 0.336 (mice) and 0.314 (rats). The conversion coefficients from the IFCC to the JSCC methods were 2.978 (mice) and 3.188 (rats). These conversion factors can be used for the mutual conversion of both measured values during the transition period from the JSCC to the IFCC method. However, it should be noted that the conversion coefficients for both LD and ALP were affected by isozyme composition.

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Lv, Yijie, Shaohua Hong e Lin Wang. "Design and Optimization of Linking Matrix for a JSCC System Based on DP-LDPC Codes". Entropy 25, n. 8 (31 luglio 2023): 1145. http://dx.doi.org/10.3390/e25081145.

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Although extensive optimization of encoding and decoding schemes for joint source-channel coding (JSCC) systems has been conducted, efficient optimization schemes are still required for designing and optimizing the linking matrix between variable nodes of the source code and check nodes of the channel code. A scheme has been proposed for design and optimization of linking matrix with multi-edges by analyzing the performance of the JSCC system using the joint protograph extrinsic information transfer algorithm to calculate decoding thresholds. The proposed scheme incorporates structural constraints and is effective in designing and optimizing the multi-edges in linking matrix for the JSCC system. Experimental results have demonstrated that the designed and optimized linking matrix significantly improves the performance of the JSCC system. Furthermore, the proposed scheme reduces the complexity of the solution space for the optimized example.

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Balsa, Jose, Óscar Fresnedo, José A. García-Naya, Tomás Domínguez-Bolaño e Luis Castedo. "JSCC-Cast: A Joint Source Channel Coding Video Encoding and Transmission System with Limited Digital Metadata". Sensors 21, n. 18 (16 settembre 2021): 6208. http://dx.doi.org/10.3390/s21186208.

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This work considers the design and practical implementation of JSCC-Cast, a comprehensive analog video encoding and transmission system requiring a reduced amount of digital metadata. Suitable applications for JSCC-Cast are multicast transmissions over time-varying channels and Internet of Things wireless connectivity of end devices having severe constraints on their computational capabilities. The proposed system exhibits a similar image quality compared to existing analog and hybrid encoding alternatives such as Softcast. Its design is based on the use of linear transforms that exploit the spatial and temporal redundancy and the analog encoding of the transformed coefficients with different protection levels depending on their relevance. JSCC-Cast is compared to Softcast, which is considered the benchmark for analog and hybrid video coding, and with an all-digital H.265-based encoder. The results show that, depending on the scenario and considering image quality metrics such as the structural similarity index measure, the peak signal-to-noise ratio, and the perceived quality of the video, JSCC-Cast exhibits a performance close to that of Softcast but with less metadata and not requiring a feedback channel in order to track channel variations. Moreover, in some circumstances, the JSCC-Cast obtains a perceived quality for the frames comparable to those displayed by the digital one.

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Dong, Yanfei, e Kai Niu. "Double Polar Codes for Joint Source and Channel Coding". Electronics 11, n. 21 (31 ottobre 2022): 3557. http://dx.doi.org/10.3390/electronics11213557.

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In this paper, we design a joint source and channel coding (JSCC) framework combining the source polar coding and the channel polar coding. The source is first compressed using a polar code (PC), and source check decoding is employed to construct an error set containing the index of all source decoding errors. Then, the proposed JSCC system employs another PC or systematic PC (SPC) to protect the compressed source and the error set against noise, which is called double PC (D-PC) or systematic double PC (SD-PC), respectively. For a D-PC JSCC system, we prove a necessary condition for the optimal mapping between the source PC and the channel PC. On the receiver side, by introducing the joint factor graph representation of the D-PC and SD-PC, we propose two joint source and channel decoders: a joint belief propagation (J-BP) decoder, and a systematic joint belief propagation (SJ-BP) decoder. In addition, a biased extrinsic information transfer (B-EXIT) chart is developed for various decoders as a theoretical performance evaluation tool. Both B-EXIT and simulation results show that the performance of the proposed JSCC scheme has no error floor and outperforms the turbo-like BP decoder.

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Bao, Han, Can Zhang e Shaoshuai Gao. "Design and Analysis of Joint Source-Channel Code System with Fixed-Length Code". Information 13, n. 6 (31 maggio 2022): 281. http://dx.doi.org/10.3390/info13060281.

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As the demands of multimedia and data services increase, efficient communication systems are being investigated to meet the high data rate requirements. Joint source-channel coding (JSCC) schemes were proposed for improving overall system performance. However, existing JSCC systems may suffer a symbol error rate (SER) performance loss when residual source redundancy is not fully exploited. This paper presents a novel, low-complexity JSCC system, which consists of a fixed-length source block code and an irregular convolutional channel code. A simple approach is proposed to design source codes that minimize the SER of source detection and guarantee the convergence of iterative source-channel decoding (ISCD). To improve the waterfall performance of ISCD, the channel code is optimized by using the extrinsic information transfer (EXIT) chart and the concept of irregular code. The channel code is constituted by recursive non-systematic convolutional (RNSC) subcodes. The weights of subcodes are optimized to make the EXIT curves of the channel decoder and the source decoder well-matched, and therefore, a near-capacity performance is achieved. Simulation results show that the proposed system achieves more than 1 dB gains and 0.3 dB gains compared to the separate source-channel code system and the other optimal JSCC systems, respectively. Additionally, the performance of the proposed system is within 1 dB deviation from the Shannon limit capacity.

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Amir Mohd Nor, Muhammad Izzat, Mohd Azri Mohd Izhar, Norulhusna Ahmad e Hazilah Md Kaidi. "Exploiting 2-Dimensional Source Correlation in Channel Decoding with Parameter Estimation". International Journal of Electrical and Computer Engineering (IJECE) 8, n. 4 (1 agosto 2018): 2633. http://dx.doi.org/10.11591/ijece.v8i4.pp2633-2642.

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Traditionally, it is assumed that source coding is perfect and therefore, the redundancy of the source encoded bit-stream is zero. However, in reality, this is not the case as the existing source encoders are imperfect and yield residual redundancy at the output. The residual redundancy can be exploited by using Joint Source Channel Coding (JSCC) with Markov chain as the source. In several studies, the statistical knowledge of the sources has been assumed to be perfectly available at the receiver. Although the result was better in terms of the BER performance, practically, the source correlation knowledge were not always available at the receiver and thus, this could affect the reliability of the outcome. The source correlation on all rows and columns of the 2D sources were well exploited by using a modified Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm in the decoder. A parameter estimation technique was used jointly with the decoder to estimate the source correlation knowledge. Hence, this research aims to investigate the parameter estimation for 2D JSCC system which reflects a practical scenario where the source correlation knowledge are not always available. We compare the performance of the proposed joint decoding and estimation technique with the ideal 2D JSCC system with perfect knowledge of the source correlation knowledge. Simulation results reveal that our proposed coding scheme performs very close to the ideal 2D JSCC system.

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Meyerowitz-Katz, Gideon, Sian Bramwell, Rajini Jayaballa, Ramy Bishay, Ian Corless, Sumathy Ravi, Linda Soars et al. "Effectiveness of joint specialist case conferences for building general practice capacity to enhance diabetes care". Journal of Integrated Care 26, n. 3 (2 luglio 2018): 199–210. http://dx.doi.org/10.1108/jica-09-2017-0029.

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Purpose Type 2 diabetes mellitus has become a major concern of Australian healthcare providers. From rates of barely more than 1 percent in the mid-90s, diabetes is now the leading cause of morbidity in the country. To combat the growing diabetes epidemic, Western Sydney Local Health District created the Western Sydney Diabetes (WSD) initiative. One of the key components of the WSD initiative since 2014 has been joint specialist case conferencing (JSCC). The purpose of this paper is to evaluate the JSCC service including both individual- and practice-based changes. Design/methodology/approach The authors evaluated the JSCC program by conducting an analysis of patient-level data in addition to a discrete practice-level study. The study aim was to examine both the effect on individual patients and the practice, as well as acceptability of the program for both doctors and their patients. The evaluation included data collection and analysis of primary patient outcomes, as well as a survey of GPs and patients. Patient data on primary outcomes were obtained by accessing and downloading them through GP practice management software by GP practice staff. Findings The authors found significant improvements at both the patient levels, with reductions in BMI, HbA1c and blood pressure sustained at three years, and at the practice level with improvements in markers of patient management. The authors also found high acceptability of the program from both patients and GPs. Originality/value This paper provides good evidence for the use of a JSCC program to improve diabetes management in primary care through capacity building with GPs.

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Song, Dan, Meiyuan Miao e Lin Wang. "Protograph Designing of P-LDPC Codes via M3 Method". Entropy 25, n. 2 (27 gennaio 2023): 232. http://dx.doi.org/10.3390/e25020232.

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Recently, a mesh model-based merging (M3) method and four basic graph models were proposed to construct the double protograph low-density parity-check (P-LDPC) code pair of the joint source channel coding (JSCC). Designing the protograph (mother code) of the P-LDPC code with both a good waterfall region and lower error floor is a challenge, and few works have existed until now. In this paper, the single P-LDPC code is improved to further verify the availability of the M3 method, and its structure is different from the channel code in the JSCC. This construction technique yields a family of new channel codes with lower power consumption and higher reliability. The structured design and better performance demonstrate that the proposed code is hardware-friendly.

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Lapshina, S. Y. "The Optimal Processor Cores' Number choice for the Parallel Cluster Multiple Labeling Technique on High-Performance Computing Systems". Information resources of Russia, n. 5 (2020): 40–43. http://dx.doi.org/10.51218/0204-3653-2020-5-40-43.

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The article is about the research of a optimum number of processor cores for launching the Parallel Cluster Multiple Labeling Technique on modern supercomputer systems installed in the JSCC RAS. This technique may be used in any field as a tool for differentiating large lattice clusters, because it is given input in a format independent of the application. At the JSCC RAS, this tool was used to study the problem of the spread of epidemics, for which an appropriate multiagent model was developed. In the course of imitation experiments, a variant of the Parallel Cluster Multiple Labeling Technique for percolation Hoshen-Kopelman clusters related to the tag linking mechanism, which can also be used in any area as a tool for differentiating large-size lattice clusters, was used to be improved on a multiprocessor system.

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Chen, Qiwang, Lin Wang, Shaohua Hong e Zixiang Xiong. "Performance Improvement of JSCC Scheme Through Redesigning Channel Code". IEEE Communications Letters 20, n. 6 (giugno 2016): 1088–91. http://dx.doi.org/10.1109/lcomm.2016.2554543.

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Sun, Ying, Chen Chen, Sanya Liu, Qiwang Chen e Lin Zhou. "Redesign of Channel Codes for Joint Source-Channel Coding Systems over One-Dimensional Inter-Symbol-Interference Magnetic Recording Channels". Electronics 11, n. 21 (27 ottobre 2022): 3490. http://dx.doi.org/10.3390/electronics11213490.

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Although the joint source-channel coding (JSCC) system based on double protograph low-density parity-check (DP-LDPC) codes has been shown to possess excellent error performance over additive white Gaussian noise (AWGN) channels, it cannot perform well over one-dimensional inter-symbol-interference (OD-ISI) magnetic recording channels. In this study, a new JSCC system with a three-stage serially concatenated framework of Turbo equalization is firstly proposed for OD-ISI magnetic recording channels. Then, a modified joint protograph extrinsic information transfer (M-JPEXIT) algorithm is put forward to analyze the convergence-performance of the proposed system. By applying the M-JPEXIT algorithm, the channel codes are redesigned for this system to improve the error performance. Both the M-JPEXIT analysis and the bit-error-rate (BER) simulation results show the performance improvement of the proposed channel codes, especially in the water-fall region.

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Geistanger, Andrea, Sabine Arends, Christoph Berding, Tadao Hoshino, Jan-Olof Jeppsson, Randie Little, Carla Siebelder e Cas Weykamp. "Statistical Methods for Monitoring the Relationship between the IFCC Reference Measurement Procedure for Hemoglobin A1c and the Designated Comparison Methods in the United States, Japan, and Sweden". Clinical Chemistry 54, n. 8 (1 agosto 2008): 1379–85. http://dx.doi.org/10.1373/clinchem.2008.103556.

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Abstract Background: The American Diabetes Association (ADA)/European Association for the Study of Diabetes (EASD)/International Diabetes Federation (IDF)/IFCC Consensus Statement on the worldwide standardization of HbA1c states that “… [HbA1c] results are to be reported world-wide in IFCC units … and derived NGSP units … , using the IFCC-NGSP master equation.” Methods: We describe statistical methods to evaluate and monitor the relationships as expressed in master equations (MEs) between the IFCC Reference Measurement procedure (IFCC-RM) and designated comparison methods (DCMs) [US National Glycohemoglobin Standardization Program (NGSP), Japanese Diabetes Society/Japanese Society for Clinical Chemistry (JDS/JSCC), and Mono-S in Sweden]. We applied these statistics, including uncertainty calculations, to 12 studies in which networks of reference laboratories participated, operating the IFCC-RM and DCMs. Results: For NGSP and Mono-S, slope, intercept, and derived percentage HbA1c at the therapeutic target show compliance with the respective MEs in all 12 studies. For JDS/JSCC, a slight deviation is seen in slope and derived percentage HbA1c in 2 of the 12 studies. Using the MEs, the uncertainty in an assigned value increases from 0.42 mmol/mol HbA1c (IFCC-RM) to 0.47 (NGSP), 0.49 (JDS/JSCC), and 0.51 (Mono-S). Conclusions: We describe sound statistical methods for the investigation of relations between networks of reference laboratories. Application of these statistical methods to the relationship between the IFCC-RM and DCMs in the US, Japan, and Sweden shows that they are suitable for the purpose, and the results support the applicability of the ADA/EASD/IDF/IFCC Consensus Statement on HbA1c measurement.

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Deka, Surajit, e Kandarpa Kumar Sarma. "JSCC-UFMC and Large MIMO Technology for High Data Rate Wireless Communication". International Journal of Mobile Computing and Multimedia Communications 11, n. 4 (ottobre 2020): 42–66. http://dx.doi.org/10.4018/ijmcmc.2020100103.

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To reduce the system complexity, cost, and overall processing time, the adoption of joint source-channel coding (JSCC) has been found to be popular. Among several options, universal filtered multi-carrier (UFMC) is regarded as the dominant contender and alternative to orthogonal frequency division multiplexing (OFDM) for upcoming wireless mobile communication networks. UFMC provides increased spectral efficiency, less peak to average power ratio (PAPR), and lower bit error rate (BER) with the removal of the cyclic prefix (CP) and grouping of subcarriers. Multiple-input and multiple-output (MIMO) technology is known to improve the capacity and throughput significantly of wireless systems. In this paper, the authors analyze the performance of UFMC techniques with Kaiser filter and Dolph-Chebyshev filter combined with JSCC in 32x32 large MIMO set-up, which provides better PAPR, power spectral density (PSD), less BER with increased channel capacity. The experimental aspects have been discussed and the results are derived using simulation mimicking near real-life situations.

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Mir, Shabir Ahmed, e T. Padma. "Evaluation of Power Minimization for Routing Protocol and Multicast Networks". Indonesian Journal of Electrical Engineering and Computer Science 9, n. 2 (1 febbraio 2018): 299. http://dx.doi.org/10.11591/ijeecs.v9.i2.pp299-301.

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In this paper explore the scenario of wireless multicast with a single source and multiple relay that together convey consecutively refined sources to multiple receiver. Joint source-channel coding (JSCC) protocol is proposed aimed at mitigating the complexity and difficulty in signal synchronization in multicast taking end-to-end mean cube error deformation as the quality of service measure the problems of JSCC communication are formulated to minimize the total power utilization where both relay selection and power allocation at the base station (BS) and all the relays are jointly determined to solve the formulated problem that is nonetheless nonlinear in nature a two-step iterative algorithm is investigated for power allocations at all transmitters where a in order quadratic programming method is developed into find a strict local minimum. To reduce the computation complexity a heuristic algorithm for relay selection is presented. Case studies are conducted to verify the proposed formulations and solution methods.

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Hoelzel, Wieland, Cas Weykamp, Jan-Olof Jeppsson, Kor Miedema, John R. Barr, Ian Goodall, Tadao Hoshino et al. "IFCC Reference System for Measurement of Hemoglobin A1c in Human Blood and the National Standardization Schemes in the United States, Japan, and Sweden: A Method-Comparison Study". Clinical Chemistry 50, n. 1 (1 gennaio 2004): 166–74. http://dx.doi.org/10.1373/clinchem.2003.024802.

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Abstract Background: The national programs for the harmonization of hemoglobin (Hb)A1c measurements in the US [National Glycohemoglobin Standardization Program (NGSP)], Japan [Japanese Diabetes Society (JDS)/Japanese Society of Clinical Chemistry (JSCC)], and Sweden are based on different designated comparison methods (DCMs). The future basis for international standardization will be the reference system developed by the IFCC Working Group on HbA1c Standardization. The aim of the present study was to determine the relationships between the IFCC Reference Method (RM) and the DCMs. Methods: Four method-comparison studies were performed in 2001–2003. In each study five to eight pooled blood samples were measured by 11 reference laboratories of the IFCC Network of Reference Laboratories, 9 Secondary Reference Laboratories of the NGSP, 3 reference laboratories of the JDS/JSCC program, and a Swedish reference laboratory. Regression equations were determined for the relationship between the IFCC RM and each of the DCMs. Results: Significant differences were observed between the HbA1c results of the IFCC RM and those of the DCMs. Significant differences were also demonstrated between the three DCMs. However, in all cases the relationship of the DCMs with the RM were linear. There were no statistically significant differences between the regression equations calculated for each of the four studies; therefore, the results could be combined. The relationship is described by the following regression equations: NGSP-HbA1c = 0.915(IFCC-HbA1c) + 2.15% (r2 = 0.998); JDS/JSCC-HbA1c = 0.927(IFCC-HbA1c) + 1.73% (r2 = 0.997); Swedish-HbA1c = 0.989(IFCC-HbA1c) + 0.88% (r2 = 0.996). Conclusion: There is a firm and reproducible link between the IFCC RM and DCM HbA1c values.

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Wang, Hao, Wei Zhang, Yizhe Jing, Yanyan Chang e Yanyan Liu. "Controversial Variable Node Selection-Based Adaptive Belief Propagation Decoding Algorithm Using Bit Flipping Check for JSCC Systems". Entropy 24, n. 3 (19 marzo 2022): 427. http://dx.doi.org/10.3390/e24030427.

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An end-to-end joint source–channel (JSC) encoding matrix and a JSC decoding scheme using the proposed bit flipping check (BFC) algorithm and controversial variable node selection-based adaptive belief propagation (CVNS-ABP) decoding algorithm are presented to improve the efficiency and reliability of the joint source–channel coding (JSCC) scheme based on double Reed–Solomon (RS) codes. The constructed coding matrix can realize source compression and channel coding of multiple sets of information data simultaneously, which significantly improves the coding efficiency. The proposed BFC algorithm uses channel soft information to select and flip the unreliable bits and then uses the redundancy of the source block to realize the error verification and error correction. The proposed CVNS-ABP algorithm reduces the influence of error bits on decoding by selecting error variable nodes (VNs) from controversial VNs and adding them to the sparsity of the parity-check matrix. In addition, the proposed JSC decoding scheme based on the BFC algorithm and CVNS-ABP algorithm can realize the connection of source and channel to improve the performance of JSC decoding. Simulation results show that the proposed BFC-based hard-decision decoding (BFC-HDD) algorithm (ζ = 1) and BFC-based low-complexity chase (BFC-LCC) algorithm (ζ = 1, η = 3) can achieve about 0.23 dB and 0.46 dB of signal-to-noise ratio (SNR) defined gain over the prior-art decoding algorithm at a frame error rate (FER) = 10−1. Compared with the ABP algorithm, the proposed CVNS-ABP algorithm and BFC-CVNS-ABP algorithm achieve performance gains of 0.18 dB and 0.23 dB, respectively, at FER = 10−3.

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Savin, G. I., B. M. Shabanov, D. S. Nikolaev, A. V. Baranov e P. N. Telegin. "Jobs Runtime Forecast for JSCC RAS Supercomputers Using Machine Learning Methods". Lobachevskii Journal of Mathematics 41, n. 12 (dicembre 2020): 2593–602. http://dx.doi.org/10.1134/s1995080220120343.

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E. KIRUBA, BETHESTHAL ELIZABETH, e ARASU S. P. VALAN. "VLSI IMPLEMENTATION OF LOW POWER IMAGE TRANSMISSION EMPLOYING MODIFIED JSCC SCHEME". i-manager's Journal on Digital Signal Processing 6, n. 4 (2018): 20. http://dx.doi.org/10.26634/jdp.6.4.16263.

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Lyu, Yibo, Shaohua Hong, Lin Wang e Zixiang Xiong. "Reliability-Oriented Decoding Strategy for LDPC Codes-Based D-JSCC System". IEEE Communications Letters 21, n. 11 (novembre 2017): 2364–67. http://dx.doi.org/10.1109/lcomm.2017.2743698.

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Liu, Sanya, Chen Chen, Lin Wang e Shaohua Hong. "Edge Connection Optimization for JSCC System Based on DP-LDPC Codes". IEEE Wireless Communications Letters 8, n. 4 (agosto 2019): 996–99. http://dx.doi.org/10.1109/lwc.2019.2903442.

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Balsa, Jose, Tomás Domínguez-Bolaño, Óscar Fresnedo, José A. García-Naya e Luis Castedo. "Transmission of Still Images Using Low-Complexity Analog Joint Source-Channel Coding". Sensors 19, n. 13 (3 luglio 2019): 2932. http://dx.doi.org/10.3390/s19132932.

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An analog joint source-channel coding (JSCC) system designed for the transmission of still images is proposed and its performance is compared to that of two digital alternatives which differ in the source encoding operation: Joint Photographic Experts Group (JPEG) and JPEG without entropy coding (JPEGw/oEC), respectively, both relying on an optimized channel encoder–modulator tandem. Apart from a visual comparison, the figures of merit considered in the assessment are the structural similarity (SSIM) index and the time required to transmit an image through additive white Gaussian noise (AWGN) and Rayleigh channels. This work shows that the proposed analog system exhibits a performance similar to that of the digital scheme based on JPEG compression with a noticeable better visual degradation to the human eye, a lower computational complexity, and a negligible delay. These results confirm the suitability of analog JSCC for the transmission of still images in scenarios with severe constraints on power consumption, computational capabilities, and for real-time applications. For these reasons the proposed system is a good candidate for surveillance systems, low-constrained devices, Internet of things (IoT) applications, etc.

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Yao, Shengshi, Zixuan Xiao e Kai Niu. "Rate–Distortion–Perception Optimized Neural Speech Transmission System for High-Fidelity Semantic Communications". Sensors 24, n. 10 (16 maggio 2024): 3169. http://dx.doi.org/10.3390/s24103169.

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We consider the problem of learned speech transmission. Existing methods have exploited joint source–channel coding (JSCC) to encode speech directly to transmitted symbols to improve the robustness over noisy channels. However, the fundamental limit of these methods is the failure of identification of content diversity across speech frames, leading to inefficient transmission. In this paper, we propose a novel neural speech transmission framework named NST. It can be optimized for superior rate–distortion–perception (RDP) performance toward the goal of high-fidelity semantic communication. Particularly, a learned entropy model assesses latent speech features to quantify the semantic content complexity, which facilitates the adaptive transmission rate allocation. NST enables a seamless integration of the source content with channel state information through variable-length joint source–channel coding, which maximizes the coding gain. Furthermore, we present a streaming variant of NST, which adopts causal coding based on sliding windows. Experimental results verify that NST outperforms existing speech transmission methods including separation-based and JSCC solutions in terms of RDP performance. Streaming NST achieves low-latency transmission with a slight quality degradation, which is tailored for real-time speech communication.

26

Tamura, Saki, Yuya Shiozaki, Mistuko Matsumura, Eiji Kuramura, Maki Kinoshita, Masashi Shimada, Shuji Matsuo e Mikio Kamioka. "Comparison of JSCC and IFCC methods in measurement of alkaline phosphatase activity". Tenri Medical Bulletin 25, n. 1 (25 dicembre 2022): 82–83. http://dx.doi.org/10.12936/tenrikiyo.25-014.

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Chen, Qiwang, Lin Wang, Shaohua Hong e Yifan Chen. "Integrated Design of JSCC Scheme Based on Double Protograph LDPC Codes System". IEEE Communications Letters 23, n. 2 (febbraio 2019): 218–21. http://dx.doi.org/10.1109/lcomm.2018.2890243.

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Liu, Sanya, Lin Wang, Jun Chen e Shaohua Hong. "Joint Component Design for the JSCC System Based on DP-LDPC Codes". IEEE Transactions on Communications 68, n. 9 (settembre 2020): 5808–18. http://dx.doi.org/10.1109/tcomm.2020.3001647.

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Xu, Zhiping, Lin Wang, Shaohua Hong, Francis C. M. Lau e Chiu-Wing Sham. "Joint Shuffled Scheduling Decoding Algorithm for DP-LDPC Codes-Based JSCC Systems". IEEE Wireless Communications Letters 8, n. 6 (dicembre 2019): 1696–99. http://dx.doi.org/10.1109/lwc.2019.2937766.

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Coudoux, F. X., M. G. Gazalet, C. Mouton-Goudemand, P. Corlay e M. Gharbi. "Extended Coverage for DSL Video Distribution Using a Quality-Oriented JSCC Architecture". IEEE Transactions on Broadcasting 54, n. 3 (settembre 2008): 525–31. http://dx.doi.org/10.1109/tbc.2008.2001144.

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31

Chen, Chen, Lin Wang e Sanya Liu. "The Design of Protograph LDPC Codes as Source Codes in a JSCC System". IEEE Communications Letters 22, n. 4 (aprile 2018): 672–75. http://dx.doi.org/10.1109/lcomm.2018.2804382.

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Chao Zhou, Chia-Wen Lin, Xinggong Zhang e Zongming Guo. "A Novel JSCC Scheme for UEP-Based Scalable Video Transmission Over MIMO Systems". IEEE Transactions on Circuits and Systems for Video Technology 25, n. 6 (giugno 2015): 1002–15. http://dx.doi.org/10.1109/tcsvt.2014.2364418.

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Tianyu Wu, V. K. N. Lau e Shunqing Zhang. "Design and analysis of MIMO joint source channel coding (JSCC) with limited feedback". IEEE Transactions on Wireless Communications 8, n. 6 (giugno 2009): 2920–26. http://dx.doi.org/10.1109/twc.2009.071109.

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Chen, Qiwang, Shaohua Hong e Yifan Chen. "Design of Linking Matrix in JSCC Scheme Based on Double Protograph LDPC Codes". IEEE Access 7 (2019): 92176–83. http://dx.doi.org/10.1109/access.2019.2927864.

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Abramov, A. G., A. A. Gonchar e A. V. Evseev. "THE NEW GENERATION NATIONAL RESEARCH COMPUTER NETWORK AS AN INFRASTRUCTURE AND SERVICE PLATFORM FOR A UNIFIED DIGITAL SPACE OF SCIENTIFIC KNOWLEDGE". Information resources of Russia, n. 5 (2020): 43–46. http://dx.doi.org/10.51218/0204-3653-2020-5-43-46.

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The paper provides general information on the architecture of the new generation National Research Computer Network (NIKS), operated and evolved by JSCC RAS. The opportunities provided by NIKS for improvement of a unified digital space of scientific knowledge, increasing the level of accessibility, information security and network protection of its resources and services are denoted. The specialized scientific services and services for collective use including those built on the technologies of federated authentication and authorization and developed on the basis of the NIKS infrastructure are presented.

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Liu, Xinyue, Zhen Huang, Yulu Zhang, Yunjian Jia e Wanli Wen. "CNN and Attention-Based Joint Source Channel Coding for Semantic Communications in WSNs". Sensors 24, n. 3 (1 febbraio 2024): 957. http://dx.doi.org/10.3390/s24030957.

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Wireless Sensor Networks (WSNs) have emerged as an efficient solution for numerous real-time applications, attributable to their compactness, cost-effectiveness, and ease of deployment. The rapid advancement of 5G technology and mobile edge computing (MEC) in recent years has catalyzed the transition towards large-scale deployment of WSN devices. However, the resulting data proliferation and the dynamics of communication environments introduce new challenges for WSN communication: (1) ensuring robust communication in adverse environments and (2) effectively alleviating bandwidth pressure from massive data transmission. In response to the aforementioned challenges, this paper proposes a semantic communication solution. Specifically, considering the limited computational and storage resources of WSN devices, we propose a flexible Attention-based Adaptive Coding (AAC) module. This module integrates window and channel attention mechanisms, dynamically adjusts semantic information in response to the current channel state, and facilitates adaptation of a single model across various Signal-to-Noise Ratio (SNR) environments. Furthermore, to validate the effectiveness of this approach, the paper introduces an end-to-end Joint Source Channel Coding (JSCC) scheme for image semantic communication, employing the AAC module. Experimental results demonstrate that the proposed scheme surpasses existing deep JSCC schemes across datasets of varying resolutions; furthermore, they validate the efficacy of the proposed AAC module, which is capable of dynamically adjusting critical information according to the current channel state. This enables the model to be trained over a range of SNRs and obtain better results.

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Xu, Zhiping, Lin Wang e Shaohua Hong. "Joint Early Stopping Criterions for Protograph LDPC Codes-Based JSCC System in Images Transmission". Entropy 23, n. 11 (24 ottobre 2021): 1392. http://dx.doi.org/10.3390/e23111392.

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In this paper, a joint early stopping criterion based on cross entropy (CE), named joint CE criterion, is presented for double-protograph low-density parity-check (DP-LDPC) codes-based joint source-channel coding (JSCC) systems in images transmission to reduce the decoding complexity and decrease the decoding delay. The proposed early stopping criterion adopts the CE from the output likelihood ratios (LLRs) of the joint decoder. Moreover, a special phenomenon named asymmetry oscillation-like convergence (AOLC) in the changing process of CE is uncovered in the source decoder and channel decoder of this system meanwhile, and the proposed joint CE criterion can reduce the impact from the AOLC phenomenon. Comparing to the counterparts, the results show that the joint CE criterion can perform well in the decoding complexity and decoding latency in the low–moderate signal-to-noise ratio (SNR) region and achieve performance improvement in the high SNR region with appropriate parameters, which also demonstrates that this system with joint CE is a low-latency and low-power system.

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Kuzovlev, D. I., e V. V. Markov. "DEFORMATION OF A TWO-DIMENSIONAL TRACE PATTERN OF A DETONATION FLOW WITH A “CONTINUOUS” CHANGE IN THE WIDTH OF A FLAT CHANNEL". Доклады Российской академии наук. Физика, технические науки 511, n. 1 (1 luglio 2023): 50–54. http://dx.doi.org/10.31857/s2686740023040089.

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A numerical study of two-dimensional cellular detonation of a hydrogen-air mixture in channels of various widths was carried out and data were obtained on the process of formation of a cellular structure, on the number, shape, and size of cells depending on the channel width. Based on the results of calculations, a classification of two-dimensional cellular detonation structures was carried out. The study was carried out at the facilities of the JSCC RAS. The flow model of a multicomponent reacting mixture was implemented using a customized opensource solver of the OpenFoam framework based on the Kurganov–Tadmor scheme.

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Hiroshima, Kenzo, Akihiko Yoshizawa, Akemi Takenaka, Reiji Haba, Kunimitsu Kawahara, Yuko Minami, Hirokuni Kakinuma et al. "Cytology Reporting System for Lung Cancer from the Japan Lung Cancer Society and Japanese Society of Clinical Cytology: An Interobserver Reproducibility Study and Risk of Malignancy Evaluation on Cytology Specimens". Acta Cytologica 64, n. 5 (2020): 452–62. http://dx.doi.org/10.1159/000506431.

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Introduction: The classification of lung carcinoma is based on small biopsies and/or cytology in 80% of patients with non-small cell carcinoma. However, there is no widely accepted classification system for respiratory cytology. The Japan Lung Cancer Society (JLCS) and Japanese Society of Clinical Cytology (JSCC) have proposed a new four-tiered cytology reporting system for lung carcinoma with the following categories: (1) “negative for malignancy,” (2) “atypical cells,” (3) “suspicious for malignancy,” and (4) “malignancy.” Objective: The aim of this work was to perform an interobserver reproducibility study to confirm the utility of the four-tiered reporting system on respiratory cytological samples. Methods: We analyzed 90 cytological samples obtained with bronchoscopy. Seven observers classified these cases into each category by reviewing one Papanicolaou-stained slide per case according to the three-, four-, and five-tiered reporting systems. Results: The interobserver agreement was fair in the three- (κ = 0.50), four- (κ = 0.45), and five-tiered (κ = 0.45) reporting systems. However, the four-tiered reporting system provided more precise information than the three-tiered reporting system in patient management. The risk of malignancy in the four-tiered reporting system was also stratified well: 19.3% for “negative for malignancy,” 45.6% for “atypical cells,” 74.7% for “suspicious for malignancy,” and 88.1% for “malignancy.” Conclusions: The reporting system proposed by the JLCS and JSCC was designed to enhance the communication between clinicians and pathologists and among different institutions. It is simple and applicable to cytological diagnosis of any respiratory diseases. We propose establishing an international classification for respiratory cytology, harmonizing the reporting systems proposed by different countries.

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Weykamp, Cas, W. Garry John, Andrea Mosca, Tadao Hoshino, Randie Little, Jan-Olof Jeppsson, Ian Goodall et al. "The IFCC Reference Measurement System for HbA1c: A 6-Year Progress Report". Clinical Chemistry 54, n. 2 (1 febbraio 2008): 240–48. http://dx.doi.org/10.1373/clinchem.2007.097402.

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Abstract Background: The IFCC Reference Measurement System for hemoglobin (Hb)A1c (IFCC-RM) has been developed within the framework of metrologic traceability and is embedded in a network of 14 reference laboratories. This paper describes the outcome of 12 intercomparison studies (periodic evaluations to control essential elements of the IFCC-RM). Methods: Each study included: unknown samples (to test individual network laboratories); known samples (controls); recently manufactured calibrators (to check calculated assigned value); stored calibrators (to test stability) and a calibration-set (to calibrate the IFCC-RM). The unknown samples are measured by use of the IFCC-RM and the designated comparison methods [DCMs; the National Glycohemoglobin Standardization Program (NGSP) in the US, Japanese Diabetes Society/Japanese Society for Clinical Chemistry (JDS/JSCC) in Japan, and Mono-S in Sweden] are used to investigate the stability of the Master Equation (ME), the relationship between IFCC-RM and DCMs. Results: A total of 105 IFCC-RM data sets were evaluated: 95 were approved, 5 were not, and for 5 no data were submitted. Trend analysis of the MEs, expressed as change in percentage HbA1c per year, revealed 0.000% (NGSP, not significant), −0.030%, (JDS/JSCC; significant) and −0.016% (Mono-S; not significant). Evaluation of long-term performance revealed no systematic change over time; 2 laboratories showed significant bias, 1 poor reproducibility. The mean HbA1c determined by laboratories performing mass spectrometry (MS) was the same as the mean determined by laboratories using capillary electrophoresis (CE), but the reproducibility at laboratories using CE was better. One batch of new calibrators was not approved. All stored calibrators were stable. Conclusion: A sound reference system is in place to ensure continuity and stability of the analytical anchor for HbA1c.

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Song, Dan, Lin Wang, Qiwang Chen e Guanrong Chen. "Optimal Design of Joint Protomatrix for DP-LDPC Codes-Based JSCC System Over on-Body Channel". IEEE Access 9 (2021): 33091–101. http://dx.doi.org/10.1109/access.2021.3061134.

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42

Hong, Shaohua, Qiwang Chen e Lin Wang. "Performance analysis and optimisation for edge connection of JSCC system based on double protograph LDPC codes". IET Communications 12, n. 2 (30 gennaio 2018): 214–19. http://dx.doi.org/10.1049/iet-com.2017.0787.

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43

Chen, Qiwang, Zhiping Xu, Huihui Wu e Guofa Cai. "Analysis and Optimization of a General Linking Matrix for JSCC Scheme Based on Double LDPC Codes". Entropy 25, n. 2 (19 febbraio 2023): 382. http://dx.doi.org/10.3390/e25020382.

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A key component of the joint source-channel coding (JSCC) scheme based on double low-density parity-check (D-LDPC) codes is the introduction of a linking matrix between the source LDPC code and channel LDPC code, by which the decoding information including the source redundancy and channel state information can be transferred iteratively. However, the linking matrix is a fixed one-to-one mapping, i.e., an identity matrix in a conventional D-LDPC code system, which may not take full advantage of the decoding information. Therefore, this paper introduces a general linking matrix, i.e., a non-identity linking matrix, connecting the check nodes (CNs) of the source LDPC code and the variable nodes (VNs) of the channel LDPC code. Further, the encoding and decoding algorithms of the proposed D-LDPC coding system are generalized. A joint extrinsic information transfer (JEXIT) algorithm is derived for calculating the decoding threshold of the proposed system with a general linking matrix. In addition, several general linking matrices are optimized with the aid of the JEXIT algorithm. Finally, the simulation results demonstrate the superiority of the proposed D-LDPC coding system with general linking matrices.

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Suwardianto, Heru, e Vitaria Wahyu Astuti. "Kompetensi Pengkajian Primary Survey dengan Pendekatan Metode Journal Sharing Of Critical Care (JSCC) pada Mahasiswa Profesi Ners". (JKG) JURNAL KEPERAWATAN GLOBAL 5, n. 2 (22 dicembre 2020): 74–81. http://dx.doi.org/10.37341/jkg.v5i2.111.

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Background: Primary Survey is important to be achieved by nursing students in carrying out early detection of critical patient conditions. Innovation of learning methods is a challenge for teachers to improve the quality of student competencies. The research objective is the Primary Survey critical nursing competency with the method of journal sharing of critical care (JSCC) approach to nursing professional students. Methods: The research design is descriptive analytic. The study population was all professional students in 2020. The research sample was professional students in 2020 using total sampling. The size of the study sample was 39 respondents with the inclusion of students who had completed the medical surgical nursing profession and followed the critical nursing profession to completion. Primary Survey independent variable. Data were collected using a questionnaire and analyzed using data frequency distribution. Results: Showed that the most respondents had primary survey critical nursing competency values obtained good value on the airway assessment of 53.8 respondents, breathing assessment of 56.4% of respondents, Circulation assessment of 61.5% of respondents, Disability assessment of 56.4 % of respondents, and Exprosure Assessment by 59% of respondents. Conclusion: The implementation of learning methods for journal sharing of critical care has a positive impact on student competencies to carry out primary survey assessments and produce good student competencies. It is not only the learning process that supports a competency but also the ability of students to follow the learning method.

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Hongjiang Xiao, Qionghai Dai, Xiangyang Ji e Wenwu Zhu. "A Novel JSCC Framework With Diversity-Multiplexing-Coding Gain Tradeoff for Scalable Video Transmission Over Cooperative MIMO". IEEE Transactions on Circuits and Systems for Video Technology 20, n. 7 (luglio 2010): 994–1006. http://dx.doi.org/10.1109/tcsvt.2010.2051277.

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Solomatin, Roman S., e Ilya V. Semenov. "Modelling of hydrogen-air supersonic mixing and combustion in near-wall region". Russian Journal of Numerical Analysis and Mathematical Modelling 36, n. 2 (1 aprile 2021): 101–15. http://dx.doi.org/10.1515/rnam-2021-0009.

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Abstract Turbulent mixing, ignition, and flame stabilization in the non-premixed supersonic hydrogen-air flow is numerically modelled in a near-wall region. Mixing algorithm based on the turbulence approach SARANS (Reynolds Averaged Navier–Stokes equations closed with Spalart–Allmaras turbulence model) with a diffusion model and a detailed kinetic model for hydrogen-air chemical reactions are employed. The system of governing equations that consists of basic conservation laws and the turbulence model equation is solved in a coupled manner with the LU–SGS–GMRES method. The model is applied to simulate the process of hydrogen injection into a M = 2.44 air flow with their subsequent mixing, ignition, and combustion in the Burrows– Kurkov chamber. The results are compared to available experimental and reference computational data. All calculations are carried out on the ‘MVS-10P’ JSCC RAS supercomputer cluster.

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Lv, Yijie, Jiguang He, Weikai Xu e Lin Wang. "Design of Low-Density Parity-Check Code Pair for Joint Source-Channel Coding Systems Based on Graph Theory". Entropy 25, n. 8 (10 agosto 2023): 1189. http://dx.doi.org/10.3390/e25081189.

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In this article, a graph-theoretic method (taking advantage of constraints among sets associated with the corresponding parity-check matrices) is applied for the construction of a double low-density parity-check (D-LDPC) code (also known as LDPC code pair) in a joint source-channel coding (JSCC) system. Specifically, we pre-set the girth of the parity-check matrix for the LDPC code pair when jointly designing the two LDPC codes, which are constructed by following the set constraints. The constructed parity-check matrices for channel codes comprise an identity submatrix and an additional submatrix, whose column weights can be pre-set to be any positive integer numbers. Simulation results illustrate that the constructed D-LDPC codes exhibit significant performance improvement and enhanced flexible frame length (i.e., adaptability under various channel conditions) compared with the benchmark code pair.

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Suwardianto, Heru, e Vitaria Wahyu Astuti. "Competency In Critical Care Nursing With Approach Methods Journal Sharing of Critical Care (JSCC) In Nursing Profession Students". STRADA Jurnal Ilmiah Kesehatan 9, n. 2 (1 novembre 2020): 686–93. http://dx.doi.org/10.30994/sjik.v9i2.361.

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The results showed that most respondents had good critical nursing competency scores including primary assessment: airway assessment (53.8%); breathing assessment (56.4%); Circulation assessment (61.5%); Disability assessment (56.4%); and Exposure assessment (59%), professionalism (56.4%), critical nursing care competencies (79.5%), Clinical reasoning process (71.8%), Patient safety (61.5%) and critical care exam score (46.2%). The result of statistical test with Pearson test obtained that the primary assessment: airway assessment (ρ = 0.038); circulation assessment (ρ = 0.029); Exposure assessment (ρ = 0.023), competence of critical nursing care (ρ = 0.049), clinical reasoning process (ρ = 0.028) and patient safety (ρ = 0.001) have a significant relationship to the critical care exam score. The implementation of learning methods for journal sharing of critical care has a positive impact on competencies and results in good student competencies.

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Chen, Qiwang, Yanzhao Ren, Lin Zhou, Chen Chen e Sanya Liu. "Design and Analysis of Joint Group Shuffled Scheduling Decoding Algorithm for Double LDPC Codes System". Entropy 25, n. 2 (15 febbraio 2023): 357. http://dx.doi.org/10.3390/e25020357.

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In this paper, a joint group shuffled scheduling decoding (JGSSD) algorithm for a joint source-channel coding (JSCC) scheme based on double low-density parity-check (D-LDPC) codes is presented. The proposed algorithm considers the D-LDPC coding structure as a whole and applies shuffled scheduling to each group; the grouping relies on the types or the length of the variable nodes (VNs). By comparison, the conventional shuffled scheduling decoding algorithm can be regarded as a special case of this proposed algorithm. A novel joint extrinsic information transfer (JEXIT) algorithm for the D-LDPC codes system with the JGSSD algorithm is proposed, by which the source and channel decoding are calculated with different grouping strategies to analyze the effects of the grouping strategy. Simulation results and comparisons verify the superiority of the JGSSD algorithm, which can adaptively trade off the decoding performance, complexity and latency.

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Coudoux, François-Xavier. "Extending Coverage of High Definition TV Services over ADSL2 with Optimized Reception Quality using H.264/AVC Transrating". Journal of Communications Software and Systems 8, n. 3 (21 settembre 2012): 68. http://dx.doi.org/10.24138/jcomss.v8i3.168.

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In this paper, we present a new Joint Source-Channel Coding (JSCC) architecture to extend the coverage of H.264/AVC High Definition (HD) video delivery over Digital Subscriber Line (DSL). The proposed solution combines low complexity H.264/AVC transrating as well as multi-carrier transmission and takes into account realistic ADSL2 specifications including all OSI layers. Both transrating and bit and power loading transmission parameters are automatically optimized in terms of end-user perceived quality, with respect to the characteristics of the given subscriber’s loop. Several originalities have been included: a new optimization algorithm has been developed, as well as a full rate-distortion modelling of the H.264/AVC transrater’s performances. Simulation results show that the proposed solution can extend the coverage area of HD video delivery up to more than one kilometre. It should allow the widespread distribution of HD video contents and increase the number of eligible subscribers.

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