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Performance Evaluation of Serial and Parallel concatenated Channel coding Scheme With Non-Orthogonal Multiple Access for 6G Networks

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IEEE ACCESS 2022年 10卷 39681-39690页

作者： Ahmed, Aya Kh Al-Raweshidy, Hamed S. Brunel Univ London Coll Engn Design & Phys Sci CEDPS Dept Elect & Elect Engn EEE Uxbridge UB8 3PH Middx England

In recent years, with the advent of 6G and intelligent devices, sensors, and new applications such as virtual reality and autonomous driving, user data traffic has exploded, especially video traffic and small IoT packets. These bandwidth-hungry applications require an increased network capacity and user access. The 6G network may use nonorthogonal multiple access (NOMA) instead of orthogonal multiple access (OMA) to maintain higher data rates, throughput, and lower latency. On the other hand, choosing the channel coding method for future 6G mobile communication is critical for maintaining the high demand for 6G. This paper proposes two-channel coding structures to achieve higher data rates with a lower error rate floor;these structures are polar convolutional serial code (PCSC) and polar convolutional parallel code (PCPC);these structures can achieve a larger channel capacity and reduced bit error rates when used with NOMA. The obtained simulation results showed that bit error rate (BER) performance improves the overall coding gain by 1.2 dB compared to polar code in fifth-generation (5G). PCSC surpasses PCPC with a 1.5dB coding gain. This performance ranged from 4 to 6.25dB with higher system settings. The obtained throughput results showed an improvement of 56-60%, in which the enhancement percentage depended on the modulation method used in a direct proportion manner.

关键词： Codes NOMA Channel coding 6G mobile communication Polar codes Convolutional codes Decoding concatenated coding convolutional coding non-orthogonal multiple access (NOMA) polar coding terahertz (THz) 6G

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concatenated Coset coding in a Multi-tone DHA FH OFDMA System with Order Statistics-based Reception 10

Concatenated Coset Coding in a Multi-tone DHA FH OFDMA Syste...

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10th IEEE International Conference on Communication, Networks and Satellite (IEEE COMNETSAT)

作者： Osipov, Dmitry RAS Kharkevich Inst Informat Transmiss Problems Moscow Russia Natl Res Univ Higher Sch Econ Moscow Russia

ISBN: (纸本)9781665434348

A coded modulation scheme for a single-band multi-tone DHA FH OFDMA system that employs order statistics-based reception and a concatenation of coset codes is proposed. It is demonstrated that this coded modulation scheme provides profound performance gain over the conventional coded single-band multi-tone DHA FH OFDMA while preserving the effective transmission rate at the expense of minor complexity increase.

关键词： dynamic hopset allocation frequency hopping nonparametric detection concatenated coding multi-tone transmission coset codes

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concatenated Reed-Solomon convolutional coding for data transmission in CDMA-based cellular systems

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IEEE TRANSACTIONS ON COMMUNICATIONS 1997年第10期45卷 1291-1303页

作者： Cideciyan, RD Eleftheriou, E Rupf, M SIEMENS SCHWEIZ AG EUKCH-8047 ZURICHSWITZERLAND

A robust error control scheme for data transmission in CDMA-based cellular systems is proposed which employs outer Reed-Solomon codes concatenated with inner convolutional codes, The performance of this scheme is analyzed assuming nonperiodic random spreading sequences and a Rake receiver with perfect knowledge of the channel. In particular, a simple model for the memoryless inner coding channel that encompasses the effects of multiple access interference, self-noise and thermal noise is first derived. Using new tight upper bounds on bit-and symbol-error probabilities of convolutional codes over Nakagami, Rayleigh, and Rician fading multipath channels, the performance of the concatenated coding scheme is then evaluated. The Reed-Solomon/convolutional coding scheme has been adopted by the European RACE project Code Division Testbed (CODIT) and implemented in an experimental testbed, The code design methodology, which has been used to specify the 9.6-, 64-, and 128-kbit/s data traffic channels of the CODIT testbed, is presented and the single-cell CDMA capacity is computed.

关键词： CDMA cellular systems concatenated coding convolutional codes

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Globally Coupled Finite Geometry and Finite Field LDPC coding Schemes

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2021年第9期70卷 9207-9216页

作者： Nasseri, Mona Xiao, Xin Vasic, Bane Lin, Shu Univ North Florida Sch Engn Jacksonville FL 32224 USA Univ Arizona Dept Elect & Comp Engn Tucson AZ 85721 USA Univ Calif Davis Dept Elect & Comp Engn Davis CA 95616 USA

This paper presents two types of concatenated LDPC coding schemes which are viewed as generalized globally coupled (GC) LDPC coding schemes in which outer codes serve as the local codes for correcting local errors and inner codes serve as global coupling codes to correct global errors. The first type of concatenated LDPC coding scheme globally couples a finite geometry (FG) LDPC code as the local code and a finite field (FF) LDPC code as the global coupling code. This type of global coupling, called GC-FG/FF-LDPC coupling, combines the distinct features of both FG- and FF-LDPC codes to achieve low error rates at a rapid decoding convergence and an error performance close to the Shannon limit. Decoding of a GC-FG/FF-LDPC code is carried out in two iterative phases, global/local or local/global. In the second type of concatenated LDPC coding scheme, both local and global coupling codes are FF-LDPC codes. If both local and global coupling codes are constructed from the same finite field and have the same graphical structures, a GC-FF/FF-LDPC code can be decoded in one phase or two phases iteratively, otherwise, it can be decoded in two phases. Construction of GC-FF/FF-LDPC codes is very flexible in lengths and rates. The proposed two-phase iterative decoding is practically implementable.

关键词： Iterative decoding Couplings Galois fields Channel coding Finite element analysis Decoding Geometry concatenated coding finite geometry LDPC code finite field LDPC code global coupling iterative decoding

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Comparison of convolutional and turbo coding for broadband FWA systems

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IEEE TRANSACTIONS ON BROADCASTING 2007年第2期53卷 494-503页

作者： Chatzigeorgiou, Ioannis A. Rodrigues, Miguel R. D. Wassell, Ian J. Carrasco, Rolando A. Univ Cambridge Comp Lab Digital Technol Grp Cambridge CB3 0FD England Newcastle Univ Sch EE&C Commun & Signal Proc Grp Newcastle Upon Tyne NE1 7RU Tyne & Wear England

It has been demonstrated that turbo codes substantially outperform other codes, e.g., convolutional codes, both in the non-fading additive white Gaussian noise (AWGN) channel as well as multiple-transmit and multiple-receive antenna fading channels. Moreover, it has also been reported that turbo codes perform very well in fast fading channels, but perform somewhat poorly on slow and block fading channels of which the broadband fixed wireless access (FWA) channel is an example. In this paper, we thoroughly compare the performance of turbo-coded and convolutional-coded broadband FWA systems both with and without antenna diversity under the condition of identical complexity for a variety of decoding algorithms. In particular, we derive mathematical expressions to characterize the complexity of turbo decoding based on state-of-the-art Log-MAP and Max-Log-MAP algorithms as well as convolutional decoding based on the Viterbi algorithm in terms of the number of equivalent addition operations. Simulation results show that turbo codes do not offer any performance advantage over convolutional codes in FWA systems without antenna diversity or FWA systems with limited antenna diversity. Indeed, turbo codes only outperform convolutional codes in FWA systems having significant antenna diversity.

关键词： algorithms communication system performance complexity theory concatenated coding convolutional codes decoding fading channels iterative methods trellis codes

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Low-rate channel coding with complex-valued block codes

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IEEE TRANSACTIONS ON COMMUNICATIONS 2003年第5期51卷 800-809页

作者： Dekorsy, A Kuehn, V Kammeyer, KD Lucent Technol Network Syst GmbH Bell Labs Innovat D-90411 Nurnberg Germany Univ Bremen Dept Telecommun D-28334 Bremen Germany

This paper addresses aspects of channel coding in orthogonal frequency-division multiplexing-code-division multiple access (OFDM-CDMA) uplink systems where each user occupies a bandwidth much larger than the information bit rate. This inherent bandwidth expansion allows the application of powerful low-rate codes under the constraint of low decoding costs. Three different coding strategies are considered: the combination of convolutional and repetition codes, the code-spread system consisting of one single very low-rate convolutional code and a serial concatenation of convolutional, Walsh-Hadamard and repetition code. The latter scheme is improved by combining the Walsh-Hadamard codes with an additional M-phase-shift keying modulation resulting in complex-valued Walsh-Hadamard codes (CWCs). Analytical performance evaluations will be given for these codes for the first time. The application of CWCs as inner codes in a serial code concatenation is also addressed in this paper. We derive a symbol-by-symbol maximum a posteriori decoding algorithm in the complex signal space in order to enable iterative decoding for the entire code. A comprehensive performance analysis by simulation of all the proposed coding schemes shows that the Walsh-Hadamard-based schemes are the best choice for low-to-medium system load. Note that even for fully loaded OFDM-CDMA systems, the concatenation with an inner complex-valued Walsh-Hadamard code leads to a bit-error rate less than 10(-5) for an (E) over bar (b)/N-o of about 6 dB.

关键词： block codes code-division multiple access (CDMA) concatenated coding iterative decoding orthogonal frequency-division multiplexing (OFDM) turbo codes

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coding schemes incorporating soft-decision DPSK over HF Rayleigh fading channels

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WIRELESS PERSONAL COMMUNICATIONS 2001年第2期16卷 95-113页

作者： Dimakis, CE Nissopoulos, IK Kouris, SS Aristotelian Univ Salonika Dept Elect Engn & Comp Engn Telecommun Div GR-54006 Salonika Greece

A soft-decision 8-DPSK modulation format is introduced in a concatenated coding scheme and the performance of the resulting system is evaluated over a slow Rayleigh fading HF ionospheric Link in the presence of Additive White Gaussian noise (AWGN). Well-known Ungerboeck TCM techniques are used as inner codes and a Reed-Solomon block code as outer code. The coded/modulated signal is differentially encoded before transmission to combat random phase changes caused by the channel. Soft-decision demodulator's output is used as an input to a modified Viterbi decoder that calculates the Euclidean distances of the received signal from an 8-PSK constellation adapted to the signal's amplitude variations. Block interleaving techniques are necessary to randomise long bursts of errors caused by the fading channel. Simulation results show that significant coding gains are achieved with a minor bandwidth expansion over uncoded, diversity or other coded systems. Finally, the interesting effects of interleaving on the performance of the proposed systems are analysed.

关键词： fading channels Trellis coded modulation concatenated coding differential phase shift keying interleaved coding

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Index assignment-based channel coding

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IET COMMUNICATIONS 2012年第2期6卷 172-178页

作者： Oztoprak, H. Villette, S. Kondoz, A. Univ Surrey Ctr Vis Speech & Signal Proc Guildford GU2 7XH Surrey England

A scheme named index assignment-based channel coding (IACC) has been developed for resilience of speech/audio codecs against the bit errors commonly experienced in wireless channels. Although IACC is a type of joint source channel coding, it does not intervene with the source codec design. The proposed scheme takes into account source characteristics and adjusts the amount of coding according to the sensitivity of different values of the source parameters. It is shown that source characteristics play an important role in the performance of IACC. The performance of IACC has been evaluated by applying it to parameters generated by adaptive multi-rate wideband (AMR-WB+) audio codec. A method for perceptual training of IACC codes is also proposed. The results demonstrate that the performance of IACC and IACC concatenated with convolutional coding can be superior to that of conventional convolutional coding at high and moderate bit error rates, respectively.

关键词： combined source-channel coding convolutional codes error statistics source codec design wireless channels concatenated coding adaptive multirate wideband audio codec index assignment-based channel coding speech coding bit error rates Speech and audio coding audio coding adaptive codes concatenated codes speech codecs joint source channel coding Speech processing techniques BER Radio links and equipment convolutional coding Other topics in statistics

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A better channel coding for a Link-16 waveform in pulsed-noise interference

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2014年第10期27卷 1814-1824页

作者： Kao, Chi-Han ROC Naval Acad Dept Elect Engn Kaohsiung 813 Taiwan

Link-16 is a tactical data link currently used by North Atlantic Treaty Organization (NATO) countries, the United States and its allies. The Link-16 waveform features Reed-Solomon codes for channel coding, cyclic code-shift keying for 32-ary baseband symbol modulation, minimum-shift keying for waveform modulation, and frequency hopping for transmission security. In addition to the original errors-only decoding of Reed-Solomon codes, both an errors-and-erasures decoding (EED) and a special concatenated coding are proposed in this paper to determine a better channel coding scheme for a Link-16 waveform with non-coherent detection in the presence of pulsed-noise interference (PNI). The investigation is first carried out both analytically and by simulation for the original Link-16 waveform transmitted over AWGN. It is then accomplished analytically for the proposed waveforms in both AWGN and PNI. The results show that EED achieves the best error rate performance for a Link-16 waveform in both AWGN and PNI when the signal-to-noise ratio is relatively small. When both the signal-to-noise ratio is sufficiently large and the fraction active time of PNI is small, the proposed concatenated coding outperforms both EED and errors-only decoding. Copyright (C) 2012 John Wiley & Sons, Ltd.

关键词： concatenated coding errors-only decoding errors-and-erasures decoding Link-16 pulsed-noise interference

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Performance Analysis of OFDM Based DAB Systems Using BCH-FEC coding Technique

Performance Analysis of OFDM Based DAB Systems Using BCH-FEC...

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2nd International Conference on Frontiers in Intelligent Computing - Theory and Applications (FICTA)

作者： Agarwal, Arun Agarwal, Kabita Siksha O Anusandhan Univ ITER Coll Dept Elect & Commun Engn Bhubaneswar 751030 Odisha India CV Raman Coll Engn Dept Elect & Telecommunicat Engn Odisha India

ISBN: (纸本)9783319029313;9783319029306

Radio broadcasting technology in this era of compact disc is expected to deliver high quality audio programmes in mobile environment. The Eureka-147 Digital Audio Broadcasting (DAB) system with coded OFDM technology accomplish this demand by making receivers highly robust against effects of multipath fading environment. In this paper, we have analyzed the performance of DAB system conforming to the parameters established by the ETSI (EN 300 401) using time and frequency interleaving, concatenated Bose-Chaudhuri-Hocquenghem coding and convolutional coding method in different transmission channels. The results show that concatenated channel coding improves the system performance compared to convolutional coding.

关键词： DAB OFDM Multipath effect concatenated coding

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