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Добірка наукової літератури з теми "Code-division multiplexed (CDM) system"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Code-division multiplexed (CDM) system"

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HASSAN, KAMEL, TAHER BAZAN, and SAID SAAD. "Spectral Code Division Multiplexed System Using Optical Orthogonal Signalling." International Conference on Electrical Engineering 1, no. 1 (March 1, 1998): 471–79. http://dx.doi.org/10.21608/iceeng.1998.61105.

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2

Szabó, Gábor, and Eszter Udvary. "Advanced Approximation of Channel Quality in a VLC CDM System." Infocommunications journal, no. 2 (2018): 7–12. http://dx.doi.org/10.36244/icj.2018.2.2.

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Анотація:
Expanding the functionality of LED indoor lighting with visible light communication (VLC) allows an additional communication channel beside wireless radio in buildings. This service may be based on various channel access methods and modulation types. Code division multiplexing (CDM) is a suitable method to such an application, but it is complicated to measure the signal quality which is essential to compare different codes and settings, and necessary for some applications like position-dependent information services. Computing crest factor is a suitable method to estimate quality, but it may be inaccurate in some cases. This paper presents novel methods to approximate the quality of received CDM signals along with the crest factor, aiding the more accurate investigation of the VLC CDM technique.
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3

Kullander, Fredrik. "Crosstalk reduction in a code division multiplexed optical fiber sensor system." Optical Engineering 37, no. 7 (July 1, 1998): 2104. http://dx.doi.org/10.1117/1.601786.

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4

Hamazumi, Hiroyuki, Yasuhiro Ito, and Hiroshi Miyazawa. "Adaptive Weighted Code Division Multiplexing(AW-CDM) Transmission System for Terrestrial Digital Television Broadcasting." Journal of the Institute of Television Engineers of Japan 47, no. 10 (1993): 1367–73. http://dx.doi.org/10.3169/itej1978.47.1367.

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5

Zhang, J.-G., and A. B. Sharma. "Applications of multirate optical fibre code-division-multiplexing systems to high-speed data communications for air traffic control." Aeronautical Journal 105, no. 1043 (January 2001): 33–40. http://dx.doi.org/10.1017/s0001924000095956.

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Abstract Future air traffic control will be based on the distributed processing environment. This leads to the use of high-speed optical fibre networks and systems to connect many processors (for both general and specific purposes) and workstations in the air traffic control centres. To efficiently support such applications, communication systems should be capable of multirate operations. To achieve this aim, we propose an efficient optical fibre code-division multiplexing (OF-CDM) technique that can support multirate data communications without any increase of system complexity when compared with the equal-rate operation case. Unlike conventional optical orthogonal codes (OOCs), the use of our proposed unequal-length OOCs can eliminate any possible violation of the minimum cross-and auto-correlation constraint (i.e. ‘1’) in multirate OF-CDM systems. Thus, using unequal-length OOCs can achieve a better bandwidth efficiency and a lower bit error rate for multirate transmissions than employing conventional OOCs. Moreover, we present the design of cost-effective OF-CDM transmitters for multirate data transmissions. The proposed systems can be also employed to support future airborne real-time data distributions and computer interconnects.
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6

Xie, Liqiang, Tianxian Wang, Ping Wang, and Jianchun Xing. "On-Chip Correlator for Passive Wireless SAW Multisensor Systems." Journal of Sensors 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/2583063.

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Анотація:
For decoding the asynchronous superposition of response signals from different sensors, it is a challenge to achieve correlation in a code division multiplexing (CDM) based passive wireless surface acoustic wave (SAW) multisensor system. Therefore, an on-chip correlator scheme is developed in this paper. In contrast to conventional CDM-based systems, this novel scheme enables the correlations to be operated at the SAW sensors, instead of the reader. Thus, the response signals arriving at the reader are the result of cross-correlation on the chips. It is then easy for the reader to distinguish the sensor that is matched with the interrogating signal. The operation principle, signal analysis, and simulation of the novel scheme are described in the paper. The simulation results show the response signals from the correlations of the sensors. A clear spike pulse is presented in the response signals, when a sensor code is matched with the interrogating code. Simulations verify the feasibility of the on-chip correlator concept.
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7

Singh, Simranjit. "Novel secure and bandwidth efficient optical code division multiplexed system for future access networks." Optical Fiber Technology 32 (December 2016): 123–28. http://dx.doi.org/10.1016/j.yofte.2015.09.013.

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Zhang, Lian Jun. "The System Devise for Transmission of Multiplexed Testing Signals Using Spread Spectrum Technology Based on DSP." Advanced Materials Research 433-440 (January 2012): 3284–87. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.3284.

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Анотація:
In this paper spread spectrum transmission system of multiplex detecting signal is studied. The method of transmission after multiplex detecting based on signal spread spectrum and code division multiplexing is mentioned. The system realization for the transmission of multiplexed testing signals using spread spectrum technology based on DSP is discussed. The circuit system is devised and testing conclusion is normal.
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Takasago, Kazuya, Makoto Takekawa, Atsushi Shirakawa, and Fumihiko Kannari. "Spatial-phase code-division multiple-access system with multiplexed Fourier holography switching for reconfigurable optical interconnection." Applied Optics 39, no. 14 (May 10, 2000): 2278. http://dx.doi.org/10.1364/ao.39.002278.

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10

Radhouene, Massoudi, Zaineb Gharsallah, V. R. Balaji, Monia Najjar, S. Robinson, Vijay Janyani, M. Murugan, Gopalkrishna Hegde, and T. Sridarshini. "Design and analysis of a channel drop filter and demultiplexer based on a photonic crystal super ellipse-shaped ring resonator." Laser Physics 32, no. 11 (October 7, 2022): 116202. http://dx.doi.org/10.1088/1555-6611/ac8fe4.

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Анотація:
Abstract In advanced optical communication systems, a photonic crystal (PC) based channel drop filter (CDF) and dense wavelength division multiplexer (DWDM) demultiplexer are essential components in the design of a complete DWDM system, which offers a high transmission data rate. In the present work, a novel PC, CDF filter and demultiplexer based on a ring resonator with a super ellipse shape is designed and analyzed. To design a high-performance device, the performance parameters of the proposed components, such as transmission efficiency, spectral line width, channel spacing, Q-factor and crosstalk, are investigated. The proposed CDF is designed to drop a resonant wavelength with a high quality factor of 3955, and the ring resonator design is extended to the demultiplexer. The demultiplexer is designed to drop the four resonant wavelengths of 1579.8 nm, 1582 nm, 1583.6 nm and 1574.9 nm, respectively. The observed high quality factor (3955), bandwidth (0.4 nm) and transmission efficiency (90%) of the proposed demultiplexer will support high-performance DWDM systems
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Дисертації з теми "Code-division multiplexed (CDM) system"

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Tšoeu, Mohohlo Samuel. "Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22866.

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Анотація:
Electrical Impedance Tomography and Spectroscopy (EITS) is a noninvasive imaging technique that creates images of cross-sections "tomos" of objects by discriminating them based on their electrical impedance. This thesis investigated and successfully confirmed the use of Code Division Multiplexing (CDM) using Gold codes in Electrical Impedance Tomography and Spectroscopy. The results obtained showed 3.5% and 6.2% errors in determining the position and size of imaged anomalies respectively, with attainable imaging speed of 462 frames/second. These results are better, compared to those reported when using Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM).This new approach provides a more robust mode of EITS for fast changing dynamic systems by eliminating temporal data inconsistencies. Furthermore, it enables robust use of frequency difference imaging and spectroscopy in EITS by eliminating frequency data inconsistencies. In this method of imaging, electric current patterns are safely injected into the imaged object by a set of electrodes arranged in a single plane on the objects surface, for 2-Dimensional (2D) imaging. For 3-Dimensional (3D) imaging, more electrode planes are used on the objects surface. The injected currents result in measurable voltages on the objects surface. Such voltages are measured, and together with the input currents, and a Finite Element Model (FEM) of the object, used to reconstruct an impedance image of the cross-sectional contents of the imaged object. The reconstruction process involves the numerical solutions of the forward problem; using Finite Element solvers and the resulting ill-posed inverse problem using iterative Optimization or Computational Intelligence methods. This method has applications mainly in the Biomedical imaging and Process monitoring fields. The primary interests of the author are, in imaging and diagnosis of cancer, neonatal pneumonia and neurological disorders which are leading causes of death in Africa and world-wide.
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2

Chia-Chu, Ho. "Design and Implementation of a 10G Ethernet Passive Optical Network system with upstream traffic multiplexed by Code Division Multiple Access." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2207200515022000.

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3

Ho, Chia-Chu, and 何家駒. "Design and Implementation of a 10G Ethernet Passive Optical Network system with upstream traffic multiplexed by Code Division Multiple Access." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/55145961438790785476.

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Анотація:
碩士
國立臺灣大學
電信工程學研究所
93
In this thesis we proposed an Ethernet Passive Optical Network (EPON) system. For the broadcast downstream channel, the data rate is 10Gbps, which is compatible with the popular 10G Ethernet standard 802.3ae. The design concepts of 10Gbps downstream channel are presented, and implemented by the combination of the Field Programmable Gate Array (FPGA) and the Multisource Agreement (MSA) 300pin transponder. For the upstream channel, the Code Division Multiple Access technique is employed for the upstream multiplexing, the total rate of 1.25Gbps is achieved. We adopt the Perfect Difference Code as the spreading code, and propose the structure for the transmitter and the receiver: The transmitter is implemented by using the FPGA as the spreading code encoder, and a laser as the electrical-to-optical converter. At the receiver, we use an analog-to-digital converter to sample the received signal every chips, then use the correlator that was implemented within the FPGA to extract the desired Optical Network Unit’s (ONU) data bits. We also explain the bandwidth requirement and discuss how the multiple user interference affects our system. The bandwidth of the upstream channel is set to 2.5GHz As for the system synchronization, we define the bit and chip synchronizations that should be achieved in the CDMA uplink channel. A polling scheme is also introduced to achieve these synchronizations between Optical Line Terminal (OLT) and ONUs. The synchronization error is less than 125psec. Finally we build up the whole system to prove that the proposed system is workable.
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Частини книг з теми "Code-division multiplexed (CDM) system"

1

Sun, Siyue, Kun Wang, Guang Liang, Feng Tian, and Zaiyang Jiang. "Performance Analysis of Frequency Division Multiplex Complementary Coded CDMA Systems." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 319–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90802-1_28.

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Тези доповідей конференцій з теми "Code-division multiplexed (CDM) system"

1

Yang, Qiang, and Qiushi Chen. "Inter-channel code division multiplexing (IC-CDM) architecture for radar digital beamforming system." In 2014 IEEE Radar Conference (RadarCon). IEEE, 2014. http://dx.doi.org/10.1109/radar.2014.6875776.

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2

Schmuck, H., M. Witte, B. Deppisch, Th Pfeiffer, H. Haisch, P. Schreiber, B. Höfer, and J. Kissing. "Bidirectional optical code division multiplexed field trial system for the metro and access area." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/ofc.2001.wg4.

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3

Zeng, Rong, and Guangqiu Li. "Low Complexity Code-Multiplexed Pilot Aided Adaptive MMSE Equalizer for CDMA Systems." In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.19.

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4

Peng Wan, Zhimin Du, and Weiling Wu. "Partially directing algorithms for CDMA system with I/Q code multiplexed pilot sequences." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1004925.

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Wan, Peng, Zhimin Du, and Weiling Wu. "Partially Directing Algorithms for CDMA system with I/Q code multiplexed pilot sequences." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745664.

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