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Journal articles on the topic 'OTFS'

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Author: Grafiati

Published: 10 December 2022

Last updated: 6 September 2023

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1

Siluveru, Mounika, Dharavath Nanda, and RadhaKrishna Karne. "Study and Analysis of OTFS and OFDM." Journal of Artificial Intelligence, Machine Learning and Neural Network, no. 26 (November 29, 2022): 13–23. http://dx.doi.org/10.55529/jaimlnn.26.13.23.

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High mobility wireless communication systems have been proposed to be robust to channel-induced Doppler shift using Orthogonal Time Frequency Space (OTFS) modulation. The OTFS modulation technique is described in this paper. In addition to being in the delay-Doppler (DD) domain, OTFS has a unique and important feature. The OTFS modulation offers maximum diversity over frequency and time when coupled with an equalizer. This technique converts fading, time-varying wireless channels into time-independent, non-fading interactions that reveal their underlying geometry. Even in challenging 5G deployment settings, OTFS achieves Massive MIMO throughput gains by scaling throughput linearly with MIMO order. An analysis of peak to average power ratio (PAPR) of OFTS modulation wave forms is presented in this paper. OTFS with rectangular pulses is characterized analytically using the complementary cumulative distribution function (CCDF). The simulated CCDF for the PAPR of OTFS is compared with that for orthogonal frequency division multiplexing (OFDM) for different pulse shapes. The results show that OTFS has a better PAPR than OFDM.

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2

Guo, Xiaopeng, Biao Wang, Yunan Zhu, Zide Fang, and Zhaoyue Han. "Hamming Distance Optimized Underwater Acoustic OTFS-IM Systems." Entropy 25, no. 7 (June 24, 2023): 972. http://dx.doi.org/10.3390/e25070972.

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The orthogonal time frequency space (OTFS) modulation technique can provide reliable communication in time-varying channels. Due to the dispersive characteristics of underwater acoustic channels, this paper proposes an OTFS-IM underwater acoustic communication system based on Hamming distance optimization to reduce the impact of dispersion in underwater acoustic communication. Firstly, the OTFS-IM underwater acoustic communication system is introduced, which introduces index modulation into the Delay–Doppler (DD) domain to make the OTFS system have stronger anti-Delay–Doppler capability. In contrast, since there is index sequence redundancy in a specific index combination, a Hamming distance optimization model is used to eliminate the redundant combination in the specific index combination sequence and further improve the bit error rate performance of the system. In addition, the Hamming distance optimized OTFS-IM underwater acoustic communication system is verified by simulation analysis. The results show that the proposed Hamming distance optimized OTFS-IM can achieve more reliable bit error rate performance.

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3

Zhang, Yuzhi, Shumin Zhang, Bin Wang, Yang Liu, Weigang Bai, and Xiaohong Shen. "Deep Learning-Based Signal Detection for Underwater Acoustic OTFS Communication." Journal of Marine Science and Engineering 10, no. 12 (December 6, 2022): 1920. http://dx.doi.org/10.3390/jmse10121920.

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Orthogonal time frequency space (OTFS) is a novel two-dimensional (2D) modulation technique that provides reliable communications over time- and frequency-selective channels. In underwater acoustic (UWA) channel, the multi-path delay and Doppler shift are several magnitudes larger than wireless radio communication, which will cause severe time- and frequency-selective fading. The receiver has to recover the distorted OTFS signal with inter-symbol interference (ISI) and inter-carrier interference (ICI). The conventional UWA OTFS receivers perform channel estimation explicitly and equalization to detect transmitted symbols, which requires prior knowledge of the system. This paper proposes a deep learning-based signal detection method for UWA OTFS communication, in which the deep neural network can recover the received symbols after sufficient training. In particular, it cascades a convolutional neural network (CNN) with skip connections (SC) and a bidirectional long short-term memory (BiLSTM) network to perform signal recovery. The proposed method extracts feature information from received OTFS signal sequences and trains the neural network for signal detection. The numerical results demonstrate that the SC-CNN-BiLSTM-based OTFS detection method performs with a lower bit error rate (BER) than the 2D-CNN, FC-DNN, and conventional signal detection methods.

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4

Ren, Huarong, Weikai Xu, and Lin Wang. "Multiple-Mode Orthogonal Time Frequency Space with Index Modulation." Electronics 11, no. 16 (August 19, 2022): 2600. http://dx.doi.org/10.3390/electronics11162600.

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Recently, orthogonal time frequency space modulation with index modulation (OTFS-IM) has been proposed to improve the bit-error-rate (BER) performance of the OTFS system. However, only some of the grids in the OTFS-IM system are activated, resulting in low spectral efficiency (SE). In order to solve this problem, a new scheme called multiple-mode OTFS-IM (MM-OTFS-IM) is proposed in this paper. In the proposed scheme, all grids are activated to transmit modulation bits. Each grid in the subblock adopts a different modulation mode, and the index bits are transmitted implicitly by the combination of different constellation modes. At the receiver, a distance-based signal detection algorithm is designed, which uses the distance matrix to find the combination of the minimum sum of elements to recover the index bits. The simulation results demonstrate the enhanced performance of the proposed scheme in the time-varying channels.

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5

Fan, Yuxiang. "Performance Analysis of NOMA Transmission Systems Based on OTFS." Journal of Physics: Conference Series 2447, no. 1 (March 1, 2023): 012009. http://dx.doi.org/10.1088/1742-6596/2447/1/012009.

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Abstract Orthogonal time frequency space (OTFS) and non-orthogonal multiple-access (NOMA) are both wireless transmission technologies suitable for high-speed scenarios. This paper proposes a cross-domain transmission scheme combining OTFS and NOMA applicable to the Internet of vehicles. We establish a channel model of cross-domain transmission. Based on the downlink, we deduce the expression for the SINR of the transmitted signal. We simulate and analyze the spectrum efficiency and other performance from the perspective of the system level. At last, we make a comparison between the OTFS-based NOMA system and the OFDM-based NOMA system. Numerical results manifest that OTFS-NOMA has better performance in terms of outage spectrum efficiency.

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6

Abushattal, Abdelrahman, Salah Eddine Zegrar, Ayhan Yazgan, and Hüseyin Arslan. "A Comprehensive Experimental Emulation for OTFS Waveform RF-Impairments." Sensors 23, no. 1 (December 21, 2022): 38. http://dx.doi.org/10.3390/s23010038.

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The orthogonal time-frequency space (OTFS) waveform exceeds the challenges that face orthogonal frequency division multiplexing (OFDM) in a high-mobility environment with high time-frequency dispersive channels. Since radio frequency (RF) impairments have a direct impact on waveform behavior, this paper investigates the experimental implementation of RF-impairments that affect OTFS waveform performance and compares them to the OFDM waveform as a benchmark. Firstly, the doubly-dispersive channel effect is analyzed, and then an experimental framework is established for investigating the impact of RF-impairments, including non-linearity, carrier frequency offset (CFO), I/Q imbalances, DC-offset, and phase noise are considered. The experiments were conducted in a real indoor wireless environment using software-defined radio (SDR) at carrier frequencies of 2.4 GHz and 5 GHz based on the Keysight EXG X-Series devices. The comparison of the performances of OFDM and OTFS in the presence of RF-impairments reveals that OTFS significantly outperforms OFDM.

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7

Zhang, Mi, Xiaochen Xia, Kui Xu, Xiaoqin Yang, Wei Xie, Yunkun Li, and Yang Liu. "A Structured Sparse Bayesian Channel Estimation Approach for Orthogonal Time—Frequency Space Modulation." Entropy 25, no. 5 (May 6, 2023): 761. http://dx.doi.org/10.3390/e25050761.

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Orthogonal time–frequency space (OTFS) modulation has been advocated as a promising waveform for achieving integrated sensing and communication (ISAC) due to its superiority in high-mobility adaptability and spectral efficiency. In OTFS modulation-based ISAC systems, accurate channel acquisition is critical for both communication reception and sensing parameter estimation. However, the existence of the fractional Doppler frequency shift spreads the effective channels of the OTFS signal significantly, making efficient channel acquisition very challenging. In this paper, we first derive the sparse structure of the channel in the delay Doppler (DD) domain according to the input and output relationship of OTFS signals. On this basis, a new structured Bayesian learning approach is proposed for accurate channel estimation, which includes a novel structured prior model for the delay-Doppler channel and a successive majorization–minimization (SMM) algorithm for efficient posterior channel estimate computation. Simulation results show that the proposed approach significantly outperforms the reference schemes, especially in the low signal-to-noise ratio (SNR) region.

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8

Raviteja, P., Yi Hong, Emanuele Viterbo, and Ezio Biglieri. "Effective Diversity of OTFS Modulation." IEEE Wireless Communications Letters 9, no. 2 (February 2020): 249–53. http://dx.doi.org/10.1109/lwc.2019.2951758.

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9

Mohammadi, Abderrahim, Saad Chakkor, Ahmed El Oualkadi, Mohamed Moussaoui, Aziz Dkiouak, and Mostafa Baghouri. "Performance Evaluation of OTFS and OFDM for 6G Waveform." ITM Web of Conferences 48 (2022): 01015. http://dx.doi.org/10.1051/itmconf/20224801015.

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Orthogonal time frequency space (OTFS) modulation is a coming technique addressing the challenges of 5G and 6G. It’s appeared to bring about outstanding error performance in delay – Doppler (DeDo) channels. Still, a really fair comparison with its competitor's direct orthogonal frequency division multiplexing and is extensively used in this participation, we will make a comparison of the performance of OTFS and OFDM with the digital modulation format in terms of bit error rate (BER) versus signal-to-noise rate (SNR) for the 16- QAM technique. From the numerical simulations under MATLAB, the results showed that the OTFS admits a small BER to the OFDM in given cases

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10

Liang, Wei, Xuan Liu, Jia Shi, Lixin Li, and Junfan Hu. "Underlying Security Transmission Design for Orthogonal Time Frequency Space (OTFS) Modulation." Sensors 22, no. 20 (October 18, 2022): 7919. http://dx.doi.org/10.3390/s22207919.

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With the aim of ensuring secure transmission in high-mobility wireless scenarios, this paper proposes a 2D permutation-aided Orthogonal Time Frequency Space (OTFS) secure transmission scheme, which uses the Gosudarstvennyi Standard (GOST) algorithm to perform disturbance control on the OTFS modulation domain. Furthermore, we develop an improved SeLective Mapping (SLM) algorithm, which can significantly improve the Peak-to-Average Power Ratio (PAPR) problem with very low complexity. In addition, we carry out the security analysis, investigating the proposed scheme’s resistance performance to a range of effective attacks. Finally, our numerical results show that our proposed transmission scheme can guarantee the underlying security property of OTFS.

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11

Zhang, Jiaxiang, Anqi Lu, Rishi Thakkar, Yu Zhang, and Mohammed Maniruzzaman. "Development and Evaluation of Amorphous Oral Thin Films Using Solvent-Free Processes: Comparison between 3D Printing and Hot-Melt Extrusion Technologies." Pharmaceutics 13, no. 10 (October 3, 2021): 1613. http://dx.doi.org/10.3390/pharmaceutics13101613.

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Conventional oral dosage forms may not always be optimal especially for those patients suffering from dysphasia or difficulty swallowing. Development of suitable oral thin films (OTFs), therefore, can be an excellent alternative to conventional dosage forms for these patient groups. Hence, the main objective of the current investigation is to develop oral thin film (OTF) formulations using novel solvent-free approaches, including additive manufacturing (AM), hot-melt extrusion, and melt casting. AM, popularly recognized as 3D printing, has been widely utilized for on-demand and personalized formulation development in the pharmaceutical industry. Additionally, in general active pharmaceutical ingredients (APIs) are dissolved or dispersed in polymeric matrices to form amorphous solid dispersions (ASDs). In this study, acetaminophen (APAP) was selected as the model drug, and Klucel™ hydroxypropyl cellulose (HPC) E5 and Soluplus® were used as carrier matrices to form the OTFs. Amorphous OTFs were successfully manufactured by hot-melt extrusion and 3D printing technologies followed by comprehensive studies on the physico-chemical properties of the drug and developed OTFs. Advanced physico-chemical characterizations revealed the presence of amorphous drug in both HME and 3D printed films whereas some crystalline traces were visible in solvent and melt cast films. Moreover, advanced surface analysis conducted by Raman mapping confirmed a more homogenous distribution of amorphous drugs in 3D printed films compared to those prepared by other methods. A series of mathematical models were also used to describe drug release mechanisms from the developed OTFs. Moreover, the in vitro dissolution studies of the 3D printed films demonstrated an improved drug release performance compared to the melt cast or extruded films. This study suggested that HME combined with 3D printing can potentially improve the physical properties of formulations and produce OTFs with preferred qualities such as faster dissolution rate of drugs.

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12

Lampel, Franz, Hamdi Joudeh, Alex Alvarado, and Frans M. J. Willems. "Orthogonal Time Frequency Space Modulation Based on the Discrete Zak Transform." Entropy 24, no. 12 (November 22, 2022): 1704. http://dx.doi.org/10.3390/e24121704.

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In orthogonal time frequency space (OTFS) modulation, information-carrying symbols reside in the delay-Doppler (DD) domain. By operating in the DD domain, an appealing property for communication arises: time-frequency (TF) dispersive channels encountered in high-mobility environments become time-invariant. OTFS outperforms orthogonal frequency division multiplexing (OFDM) in high-mobility scenarios, making it an ideal waveform candidate for 6G. Generally, OTFS is considered a pre- and postprocessing step for OFDM. However, the so-called Zak transform provides the fundamental relation between the DD and time domain. In this work, we propose an OTFS system based on the discrete Zak transform (DZT). To this end, we discuss the DZT and establish the input–output relation for time-frequency (TF) dispersive channels solely by the properties of the DZT. The presented formulation simplifies the derivation and analysis of the input–output relation of the TF dispersive channel in the DD domain. Based on the presented formulation, we show that operating in the DD incurs no loss in capacity.

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13

Maršálek, Roman, Radim Zedka, Erich Zöchmann, Josef Vychodil, Radek Závorka, Golsa Ghiaasi, and Jiří Blumenstein. "Persistent Homology Approach for Human Presence Detection from 60 GHz OTFS Transmissions." Sensors 23, no. 4 (February 16, 2023): 2224. http://dx.doi.org/10.3390/s23042224.

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Orthogonal Time Frequency Space (OTFS) is a new, promising modulation waveform candidate for the next-generation integrated sensing and communication (ISaC) systems, providing environment-awareness capabilities together with high-speed wireless data communications. This paper presents the original results of OTFS-based person monitoring measurements in the 60 GHz millimeter-wave frequency band under realistic conditions, without the assumption of an integer ratio between the actual delays and Doppler shifts of the reflected components and the corresponding resolution of the OTFS grid. As the main contribution of the paper, we propose the use of the persistent homology technique as a method for processing gathered delay-Doppler responses. We highlight the advantages of the persistent homology approach over the standard constant false alarm rate target detector for selected scenarios.

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14

Özakar, Emrah, Rukiye Sevinç-Özakar, and Bilal Yılmaz. "Preparation, Characterization, and Evaluation of Cytotoxicity of Fast Dissolving Hydrogel Based Oral Thin Films Containing Pregabalin and Methylcobalamin." Gels 9, no. 2 (February 9, 2023): 147. http://dx.doi.org/10.3390/gels9020147.

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The oral availability of many drugs is problematic due to the pH of the stomach, enzymes, and first-pass effects through the liver. However, especially geriatric, pediatric, bedridden, or mentally handicapped patients and those with dysphagia have difficulty swallowing or chewing solid dosage forms. Oral Thin Films (OTFs) are one of the new drug delivery systems that can solve these problems. Pregabalin (PG) and Methylcobalamin (MC), which are frequently preferred for pain originating in the central nervous system, were brought together for the first time using OTF technology in this study. In this study, a quantification method for PG and MC was developed and validated simultaneously. Optimum formulations were selected with organoleptic and morphological controls, moisture absorption capacity, swelling capacity, percent elongation, foldability, pH, weight variability, thickness, disintegration time, and transparency tests on OTFs prepared by the solvent pouring method. Content uniformity, dissolution rate, determination of release kinetics, SEM, XRD, FT-IR, DSC, long-term stability, and cytotoxicity studies on the tongue epithelial cell line (SCC-9) were performed on selected OTFs. As a result, OTFs containing PG-MC, which are non-toxic, highly flexible, transparent, compatible with intraoral pH, with fast disintegration time (<30 s), and acceptable in taste and appearance, have been developed successfully.

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15

Zhang, Yuzhi, Shumin Zhang, Yang Wang, Qingyuan Liu, and Xiangxiang Li. "Model-Driven Deep-Learning-Based Underwater Acoustic OTFS Channel Estimation." Journal of Marine Science and Engineering 11, no. 8 (August 1, 2023): 1537. http://dx.doi.org/10.3390/jmse11081537.

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Accurate channel estimation is the fundamental requirement for recovering underwater acoustic orthogonal time–frequency space (OTFS) modulation signals. As the Doppler effect in the underwater acoustic channel is much more severe than that in the radio channel, the channel information usually cannot strictly meet the compressed sensing sparsity assumption in the orthogonal matching pursuit channel estimation algorithm. This deviation ultimately leads to a degradation in system performance. This paper proposes a novel approach for OTFS channel estimation in underwater acoustic communications, utilizing a model-driven deep learning technique. Our method incorporates a residual neural network into the OTFS channel estimation process. Specifically, the orthogonal matching pursuit algorithm and denoising convolutional neural network (DnCNN) collaborate to perform channel estimation. The cascaded DnCNN denoises the preliminary channel estimation results generated by the orthogonal matching pursuit algorithm for more accurate OTFS channel estimation results. The use of a lightweight DnCNN network with a single residual block reduces computational complexity while still preserving the accuracy of the neural network. Through extensive evaluations conducted on simulated and experimental underwater acoustic channels, the outcomes demonstrate that our proposed method outperforms traditional threshold-based and orthogonal matching pursuit channel estimation techniques, achieves superior accuracy in channel estimation, and significantly reduces the system’s bit error rate.

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16

Avni P, Desai. "An Overview of Oral Thin Film Drug Delivery Systems with Fast Dissolving Films." International Journal of Pharmaceutical Sciences and Medicine 8, no. 8 (August 30, 2023): 1–10. http://dx.doi.org/10.47760/ijpsm.2023.v08i08.001.

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Fast-dissolving oral thin films (OTFs), rather than tablets, are the product of choice for many pharmaceutical businesses. The benefits of tablets (precise dose, simple administration) and liquid dosage forms (easily swallowed, quick bioavailability) are all present in films. Four out of five patients, according to statistics, prefer orally disintegrating dose forms over traditional solid oral dosage forms. Children, the elderly, people who are bedridden, people who are emetic, and those who have CNS illnesses have trouble swallowing or digesting solid dose forms. Many of these individuals refuse to take solid dose forms because they are afraid of choking. OTFs are immediately moistened by saliva when put on the tongue's tip or base. Because of this, OTFs quickly hydrate before dissolving or disintegrating to release the drug for local or systemic absorption. This technology offers a solid foundation for the creation of patent-compliant items and for extending the patent protection of currently available goods. Fast-dissolving oral thin films can be used for a variety of purposes, including gastroprotective and sublingual delivery systems in addition to buccal fast-dissolving systems. This study emphasizes the composition, detailing the numerous natural and synthetic polymer kinds, diverse manufacturing processes, packaging materials, and assessment tests for OTFs.

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17

Tiwari, Shashank, Suvra Sekhar Das, and Vivek Rangamgari. "Low complexity LMMSE Receiver for OTFS." IEEE Communications Letters 23, no. 12 (December 2019): 2205–9. http://dx.doi.org/10.1109/lcomm.2019.2945564.

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18

Raviteja, P., Emanuele Viterbo, and Yi Hong. "OTFS Performance on Static Multipath Channels." IEEE Wireless Communications Letters 8, no. 3 (June 2019): 745–48. http://dx.doi.org/10.1109/lwc.2018.2890643.

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19

Ding, Zhiguo. "Robust Beamforming Design for OTFS-NOMA." IEEE Open Journal of the Communications Society 1 (2020): 33–40. http://dx.doi.org/10.1109/ojcoms.2019.2953574.

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20

Wang, Siqiang, Jing Guo, Xinyi Wang, Weijie Yuan, and Zesong Fei. "Pilot Design and Optimization for OTFS Modulation." IEEE Wireless Communications Letters 10, no. 8 (August 2021): 1742–46. http://dx.doi.org/10.1109/lwc.2021.3078527.

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21

Mohammed, Saif Khan. "Derivation of OTFS Modulation From First Principles." IEEE Transactions on Vehicular Technology 70, no. 8 (August 2021): 7619–36. http://dx.doi.org/10.1109/tvt.2021.3069913.

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22

Singh, Prem, Khushboo Yadav, Himanshu B. Mishra, and Rohit Budhiraja. "BER Analysis for OTFS Zero Forcing Receiver." IEEE Transactions on Communications 70, no. 4 (April 2022): 2281–97. http://dx.doi.org/10.1109/tcomm.2022.3148363.

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23

Surabhi, G. D., and A. Chockalingam. "Low-Complexity Linear Equalization for OTFS Modulation." IEEE Communications Letters 24, no. 2 (February 2020): 330–34. http://dx.doi.org/10.1109/lcomm.2019.2956709.

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24

Gong, Yi, Qingyu Li, Fanke Meng, Xinru Li, and Zhan Xu. "Data-driven deep learning for OTFS detection." China Communications 20, no. 1 (January 2023): 88–101. http://dx.doi.org/10.23919/jcc.2023.01.008.

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25

Han, Rui, Jiahao Ma, and Lin Bai. "Trajectory planning for OTFS-based UAV communications." China Communications 20, no. 1 (January 2023): 114–24. http://dx.doi.org/10.23919/jcc.2023.01.010.

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26

Teng, Elizabeth Yi Ern, Hee Xixian, and Muhamad Fareez Ismail. "Inhibitory Effect of Oral Thin Films (OTFs) Containing Xylitol Against Streptococcus mutans." Science Letters 16, no. 1 (January 10, 2022): 124. http://dx.doi.org/10.24191/sl.v16i1.13815.

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Dental Caries is a chronic disease affecting half of the global population, causing pain and discomfort due to progressive damage to the teeth. Whilst xylitol has been studied for its effect on dental caries prevention, current practices present few limitations for its successful oral delivery, including short residence time in the mouth and poor patient compliance. Recently, oral thin films (OTFs) emerged as an alternative to delivering xylitol in the oral cavity. This research aims to develop novel OTFs containing xylitol with extended-release properties (as determined by the disintegration time) and to investigate its effect on a cariogenic bacterial strain, Streptococcus mutans. The minimum inhibitory concentration (MIC) of xylitol was determined. Employing the microdilution broth method, the antibacterial activity of the oral thin films containing xylitol for oral S. mutans was performed with simulated salivary fluid, incubated at 1, 4, and 10 h. The MIC of xylitol was found at 10%. Meanwhile, there was no significant difference in the inhibition of S. mutans (p > 0.05) between the control, OTFs (10 h), and xylitol-OTF (1 h), with the latter, demonstrated only 16.58% inhibition. Interestingly, when compared to xylitol-OTF (1 h), xylitol-OTF showed significant inhibition (p < 0.05) to S. mutans after four h (+53.24 %) and almost a complete inhibition after ten h (-92.58 %). These results suggest that the OTFs demonstrated a gradual release of xylitol and inhibited oral biofilm formation by decreasing the growth of S. mutans in a time-dependent manner. Most importantly, the study indicated the successful development of a novel xylitol-OTF with potential as an oral health biotherapeutic agent.

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27

ZHANG, Yang, Qunfei ZHANG, Yingjie WANG, Chengbing HE, and Wentao SHI. "A low-complexity orthogonal time frequency space modulation method for underwater acoustic communication." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 5 (October 2021): 954–61. http://dx.doi.org/10.1051/jnwpu/20213950954.

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Compared with the orthogonal frequency division multiplexing (OFDM) modulation, the orthogonal time frequency space(OTFS) modulation has a lower peak-to-average power ratio. It can effectively resist the time selective fading caused by the Doppler effect and has significant performance advantages over doubly dispersive channels. However, the conventional OTFS linear minimum mean square error (LMMSE) method has a high complexity and is not easy to process in real time. In order to solve this problem, we propose a low-complexity equalization algorithm with infinite norm constraints based on the optimal coordinate reduction. The equalization algorithm not only obtains the optimal solution through a certain number of iterations and avoids direct matrix inversion but also equalizes infinite norm constraints to improve the symbol detection performance gains. At the same time, the OTFS delay-Doppler channel matrix we utilize is sparse and the two-norm squares of each column vector equally reduces the complexity of optimal coordinate descent. Finally, the simulation in the underwater acoustic communication scenario we designed verify the effectiveness of the proposed equalization algorithm. The simulation results show that the performance of the proposed equalization algorithm is close to that of the LMMSE method, while its low complexity is ensured.

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28

Li, Shuangyang, Weijie Yuan, Zhiqiang Wei, Jinhong Yuan, Baoming Bai, Derrick Wing Kwan Ng, and Yixuan Xie. "Hybrid MAP and PIC Detection for OTFS Modulation." IEEE Transactions on Vehicular Technology 70, no. 7 (July 2021): 7193–98. http://dx.doi.org/10.1109/tvt.2021.3083181.

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29

Cao, Bohao, Zheng Xiang, and Peng Ren. "Low complexity transmitter precoding for MU MIMO-OTFS." Digital Signal Processing 115 (August 2021): 103083. http://dx.doi.org/10.1016/j.dsp.2021.103083.

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30

Surabhi, G. D., Rose Mary Augustine, and Ananthanarayanan Chockalingam. "Peak-to-Average Power Ratio of OTFS Modulation." IEEE Communications Letters 23, no. 6 (June 2019): 999–1002. http://dx.doi.org/10.1109/lcomm.2019.2914042.

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31

Shang, Huichao, Ruifeng Chen, Haoxiang Zhang, Guoyu Ma, Ruisi He, Bo Ai, and Zhangdui Zhong. "OTFS modulation and PAPR reduction for IoT-railways." China Communications 20, no. 1 (January 2023): 102–13. http://dx.doi.org/10.23919/jcc.2023.01.009.

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32

An, Changyoung, and Heung-Gyoon Ryu. "Design and Performance Evaluation of OTFS Modulation System using 2D iDFT and DFT." Journal of the Institute of Electronics and Information Engineers 54, no. 9 (September 30, 2017): 14–20. http://dx.doi.org/10.5573/ieie.2017.54.9.14.

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33

Li, Wei, Yan Guo, Ning Li, Hao Yuan, and Cuntao Liu. "Resource Allocation and Trajectory Optimization in OTFS-Based UAV-Assisted Mobile Edge Computing." Electronics 12, no. 10 (May 12, 2023): 2212. http://dx.doi.org/10.3390/electronics12102212.

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Mobile edge computing (MEC) powered by unmanned aerial vehicles (UAVs), with the advantages of flexible deployment and wide coverage, is a promising technology to solve computationally intensive communication problems. In this paper, an orthogonal time frequency space (OTFS)-based UAV-assisted MEC system is studied, in which OTFS technology is used to mitigate the Doppler effect in UAV high-speed mobile communication. The weighted total energy consumption of the system is minimized by jointly optimizing the time division, CPU frequency allocation, transmit power allocation and flight trajectory while considering Doppler compensation. Thus, the resultant problem is a challenging nonconvex problem. We propose a joint algorithm that combines the benefits of the atomic orbital search (AOS) algorithm and convex optimization. Firstly, an improved AOS algorithm is proposed to swiftly obtain the time slot allocation and high-quality solution of the UAV optimal path. Secondly, the optimal solution for the CPU frequency and transmit power allocation is found by using Lagrangian duality and the first-order Taylor formula. Finally, the optimal solution of the original problem is iteratively obtained. The simulation results show that the weighted total energy consumption of the OTFS-based system decreases by 13.6% compared with the orthogonal frequency division multiplexing (OFDM)-based system. The weighted total energy consumption of the proposed algorithm decreases by 11.7% and 26.7% compared with convex optimization and heuristic algorithms, respectively.

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34

Ge, Yao, Qinwen Deng, P. C. Ching, and Zhi Ding. "OTFS Signaling for Uplink NOMA of Heterogeneous Mobility Users." IEEE Transactions on Communications 69, no. 5 (May 2021): 3147–61. http://dx.doi.org/10.1109/tcomm.2021.3059456.

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Wang, Tiebin, Shiwen Fan, Hao Chen, Yue Xiao, Xuemei Guan, and Wenlong Song. "Generalized Approximate Message Passing Detector for GSM-OTFS Systems." IEEE Access 10 (2022): 22997–3007. http://dx.doi.org/10.1109/access.2022.3153703.

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36

Thaj, Tharaj, and Emanuele Viterbo. "Low-Complexity Linear Diversity-Combining Detector for MIMO-OTFS." IEEE Wireless Communications Letters 11, no. 2 (February 2022): 288–92. http://dx.doi.org/10.1109/lwc.2021.3125986.

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37

S Bhat, Vighnesh, Surabhi Garudanagiri Dayanand, and Ananthanarayanan Chockalingam. "Performance Analysis of OTFS Modulation With Receive Antenna Selection." IEEE Transactions on Vehicular Technology 70, no. 4 (April 2021): 3382–95. http://dx.doi.org/10.1109/tvt.2021.3063546.

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38

Chong, Ruoxi, Shuangyang Li, Jinhong Yuan, and Derrick Wing Kwan Ng. "Achievable Rate Upper-Bounds of Uplink Multiuser OTFS Transmissions." IEEE Wireless Communications Letters 11, no. 4 (April 2022): 791–95. http://dx.doi.org/10.1109/lwc.2022.3145036.

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39

Shi, Jia, Junfan Hu, Yang Yue, Xuan Xue, Wei Liang, and Zan Li. "Outage Probability for OTFS Based Downlink LEO Satellite Communication." IEEE Transactions on Vehicular Technology 71, no. 3 (March 2022): 3355–60. http://dx.doi.org/10.1109/tvt.2022.3144466.

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40

Jing, Lianyou, Namin Zhang, Chengbing He, Jintao Shang, Xiaolong Liu, and Hongxi Yin. "OTFS underwater acoustic communications based on passive time reversal." Applied Acoustics 185 (January 2022): 108386. http://dx.doi.org/10.1016/j.apacoust.2021.108386.

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41

Raviteja, P., Yi Hong, Emanuele Viterbo, and Ezio Biglieri. "Practical Pulse-Shaping Waveforms for Reduced-Cyclic-Prefix OTFS." IEEE Transactions on Vehicular Technology 68, no. 1 (January 2019): 957–61. http://dx.doi.org/10.1109/tvt.2018.2878891.

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42

Wang, Zhenduo, Zhipeng Liu, Zhiguo Sun, and Xiaoyan Ning. "BER performance analysis of OTFS systems with power allocation." China Communications 20, no. 1 (January 2023): 24–35. http://dx.doi.org/10.23919/jcc.2023.01.003.

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43

Hu, Junfan, Jia Shi, Xianyu Wang, Xiaoju Lu, Zan Li, and Zhuangzhuang Tie. "Secrecy transmission of NOMA-OTFS based multicast-unicast streaming." China Communications 20, no. 1 (January 2023): 1–13. http://dx.doi.org/10.23919/jcc.2023.01.001.

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44

Papadiochos, Ioannis, Vasilis Petsinis, Jason Tasoulas, and Lampros Goutzanis. "Pure Orbital Trapdoor Fractures in Adults: Tight Entrapment of Perimuscular Tissue Mimicking True Muscle Incarceration with Successful Results from Early Intervention." Craniomaxillofacial Trauma & Reconstruction 12, no. 1 (March 2019): 54–61. http://dx.doi.org/10.1055/s-0038-1625965.

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Abstract:

Orbital trapdoor fractures (OTFs) entail entrapment of intraorbital soft tissues with minimal or no displacement of the affected bones and are almost exclusively seen in children. This article aimed to report the diagnosis and treatment of an OTF of the floor in an adult patient and to critically review the literature regarding the management aspects of this specific subset of orbital blowout fractures in adults. A 29-year-old man presented with limitations of vertical right eye movements owing to blunt orbital trauma. The patient mainly complained of double vision in upper gazes and some episodes of nausea. Neither floor defect nor significant bone displacement found on orbital computed tomography, while edema of inferior rectus muscle was apparent. The patient underwent surgical repair 5 days later; a linear minimally displaced fracture of the floor was recognized and complete release of the entrapped perimuscular tissues was followed. Within the first week postoperatively, full range of ocular motility was restored, without residual diplopia. This case was the only identified pure OTF over a 6-year period in our department (0.6% of 159 orbital fractures in patients >18 years). By reviewing the literature indexed in PubMed, a very limited number of either of isolated case reports or retrospective case series of pure OTFs has been reported in adults. Contrary to the typical white-eyed blowout fractures, the literature indicates that OTFs in adults seem to not always constitute absolute emergency conditions. Although such fractures need to be emergently/ immediately treated in children, in the absence of true muscle incarceration, adults may undergo successful treatment within a wider but either early or urgent frame of time. Adults frequently exhibit vagal manifestations and marked signs of local soft tissues injury.

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Zhao, Hang, Dongxuan He, Ziqi Kang, and Hua Wang. "Orthogonal Time Frequency Space (OTFS) With Dual-Mode Index Modulation." IEEE Wireless Communications Letters 10, no. 5 (May 2021): 991–95. http://dx.doi.org/10.1109/lwc.2021.3053981.

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Li, Shuangyang, Jinhong Yuan, Weijie Yuan, Zhiqiang Wei, Baoming Bai, and Derrick Wing Kwan Ng. "Performance Analysis of Coded OTFS Systems Over High-Mobility Channels." IEEE Transactions on Wireless Communications 20, no. 9 (September 2021): 6033–48. http://dx.doi.org/10.1109/twc.2021.3071493.

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Ge, Yao, Qinwen Deng, P. C. Ching, and Zhi Ding. "Receiver Design for OTFS with a Fractionally Spaced Sampling Approach." IEEE Transactions on Wireless Communications 20, no. 7 (July 2021): 4072–86. http://dx.doi.org/10.1109/twc.2021.3055585.

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Zhang, Yang, Qunfei Zhang, Chengbing He, Yi Zhou, and Lianyou Jing. "Delay-Doppler domain decision feedback turbo equalization for OTFS modulation." Physical Communication 52 (June 2022): 101699. http://dx.doi.org/10.1016/j.phycom.2022.101699.

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Wang, Dong, Bule Sun, Fanggang Wang, Xiran Li, Pu Yuan, and Dajie Jiang. "Transmit diversity scheme design for rectangular pulse shaping based OTFS." China Communications 19, no. 3 (March 2022): 116–28. http://dx.doi.org/10.23919/jcc.2022.03.008.

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Long, Fei, Kai Niu, and Jiaru Lin. "Low Complexity Block Equalizer for OTFS Based on Expectation Propagation." IEEE Wireless Communications Letters 11, no. 2 (February 2022): 376–80. http://dx.doi.org/10.1109/lwc.2021.3129051.

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