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trellis code-aided high-rate M-QAM space-time labeling diversity using a unitary expansion

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2018年第11期31卷 e3590-e3590页

作者： Dlodlo, Buthanani Xu, Hongjun Univ KwaZulu Natal Sch Engn ZA-4041 Durban South Africa Zhejiang Gongshang Univ Sch Informat & Elect Engn Hangzhou Zhejiang Peoples R China

In this paper, we present a high-rate M-ary quadrature amplitude modulation (M-QAM) space-time labeling diversity (STLD) system that retains the robust error performance of the conventional STLD system. The high-rate STLD is realised by expanding the conventional STLD via a unitary matrix transformation. Robust error performance of the high-rate STLD is achieved by incorporating trellis coding into the mapping of additional bits to high-rate codes. The comparison of spectral efficiency between the proposed trellis code-aided high-rate STLD (TC-STLD) and the conventional STLD shows that TC-STLD with 16-QAM and 64-QAM respectively achieves a 12.5% and 8.3% increase in spectral efficiency for each additional bit sent with the transmitted high-rate codeword. Moreover, we derive an analytical bound to predict the average bit error probability performance of TC-STLD over Rayleigh frequency-flat fading channels. The analytical results are verified by Monte Carlo simulation results, which show that the derived analytical bounds closely predict the average bit error probability performance at high signal-to-noise ratios (SNR). Simulation results also show that TC-STLD with 1 additional bit achieves an insignificant SNR gain of approximately 0.05dB over the conventional STLD, while TC-STLD with 2 additional bits achieves an SNR gain of approximately 0.12dB.

关键词： coherent detection space-time labeling diversity spectral efficiency trellis code

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BANDWIDTH EFFICIENCY IMPROVEMENT FOR DIFFERENTIAL ALAMOUTI SPACE-TIME BLOCK codeS USING M-QAM

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SAIEE AFRICA RESEARCH JOURNAL 2018年第4期109卷 215-221页

作者： Dlodlo, B. Xu, H. Pillay, N. Univ KwaZulu Natal Sch Engn King George V Ave ZA-4041 Durban South Africa

We propose a technique that enhances the bandwidth efficiency of the two transmit antenna differential space-time block code (DSTBC) by use of space-time block code (STBC) expansion and trellis coding. STBC expansion is realized by expanding the conventional Alamouti STBC using unitary matrix transformation. This is followed by trellis code-aided mapping of additional bits to space-time codes of the expanded set. trellis code-aided mapping of additional bits enhances the bandwidth efficiency of the proposed DSTBC scheme. The proposed scheme sends more information bits in each transmitted space-time code than the conventional differential detection-aided DSTBC (CDD-DSTBC) scheme, and yet retains the same error performance. For each additional bit sent with the transmitted space-time codeword, the proposed scheme using 16QAM achieves a 12.5% increase in bandwidth efficiency, while the scheme using 64QAM realises an 8.3% increase. Simulation results demonstrate that the error performance of the proposed scheme tightly matches that of CDD-DSTBC with improvement in bandwidth efficiency. The bandwidth efficiency is enhanced al the expense of a moderate increase of the computational complexity at the receiver.

关键词： Bandwidth efficiency coherent detection differential Alamouti space-time block codes differential detection noncoherent detection trellis code

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trellis coded Orbital Angular Momentum Modulation

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2016年第8期E99A卷 1618-1621页

作者： Zhang, Chao Ma, Lu Tsinghua Univ Sch Aerosp Engn Labs Avion Beijing 100084 Peoples R China

trellis coded modulation (TCM) concept is applied to the mode constellation points of orbital angular momentum (OAM) modulation. OAM modulation considers the multiple OAM modes as additional constellation points and maps a first part of a block of information bits to the transmitting OAM modes. Therefore, spatial multiplexing gains are retained and spectral efficiency is boosted. The second part of the block of information bits is mapped to a complex symbol using conventional digital modulation schemes. At any particular time instant, only one OAM mode is active. The receiver estimates the transmitted symbol and the active OAM mode, then uses the two estimates to retrieve the original block of data bits. Simulation reveals that with the TCM employed both for the OAM constellation points and the signal constellation points, a considerable bit error rate (BER) gain can be obtained under all turbulence conditions, compared with that of the no coding scheme.

关键词： trellis code TCM orbital angular momentum OAM

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Clustering for Cooperative Diversity Using trellis Pruning

Clustering for Cooperative Diversity Using Trellis Pruning

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Maiya, Shashank V. Fuja, Thomas E. Univ Notre Dame Dept Elect Engn Notre Dame IN 46556 USA

ISBN: (纸本)9781612842547

A recent paper by the authors demonstrated how two users (or partners) could cooperate to convey their data to a common destination through trellis pruning. With this technique, both "local" and relayed data are multiplexed together prior to modulation;then, the partner's decoder exploits its knowledge of the relayed data by pruning the code trellis to effect a lower rate (more robust) partner-to-partner link. This paper extends this technique to larger clusters of users cooperating to convey their data to a common destination. The protocol is first demonstrated for n = 3 users, and a significant performance gain is demonstrated over time-sharing in a Rayleigh fading environment. Then, the general protocol is derived and conclusions regarding performance are presented.

关键词： Decoding Encoding Fading Integrated circuits Iterative decoding Multiplexing Rayleigh fading environment Relays cooperative communication cooperative diversity partner-to-partner link pattern clustering protocols trellis code trellis codes trellis pruning

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A note on performance of generalized tail biting trellis codes

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JOURNAL OF DISCRETE MATHEMATICAL SCIENCES & CRYPTOGRAPHY 2010年第2期13卷 105-122页

作者： Hirasawa, Shigeichi Kasahara, Masao Cyber Univ Fac Informat Technol & Business Shinjuku Ku 4F1-11 Kitayamabushi Cho Tokyo 1620853 Japan Waseda Res Inst Sci & Engn Oishi Lab Shinjuku Ku Tokyo 1690072 Japan Osaka Gakuin Univ Fac Informat Suita Osaka 5648511 Japan

Tail biting trellis codes and block concatenated codes are discussed from random coding arguments. Error exponents and decoding complexity for generalized tail biting (GTB) random trellis codes, and their relationships are derived, where the GTB trellis codes consist of full tail biting (FTB) trellis codes, partial tail biting (PTB) trellis codes and direct truncated (DT) trellis codes. We show that the PTB trellis codes at all rates except for low rates are superior to all of the GTB trellis codes, in a sense that they have smaller upper bound on the probability of decoding error for given decoding complexity. We then propose the generalized version of the block concatenated codes constructed by the GTB trellis inner codes, and derive error exponents and the decoding complexity for the proposed code. The results obtained show that the DT trellis inner codes are effective among the GTB trellis inner codes for constructing the generalized version of the concatenated codes to keep the same decoding complexity as the original concatenated codes. We also show that larger error exponents are obtained by the generalized version of concatenated codes, if the decoding complexity is allowed to be larger than that of the original concatenated code, although it is still in polynomial order.

关键词： trellis code tail biting block codes concatenated codes error exponent decoding complexity

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High-quality audio transform coded excitation using trellis codes

High-quality audio transform coded excitation using trellis ...

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33rd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Fischer, Thomas R. Sung, Hosang Zhan, Jie Oh, Eunmi Washington State Univ Sch EECS Pullman WA 99163 USA Samsung Adv Inst Tech Comp & Intelligence Lab Yongin South Korea

ISBN: (纸本)9781424414833

A trellis source code and novel variable-length lossless code are used in transform coded excitation audio coding. Implemented within the extended adaptive multi-rate wideband (AMR-WB+) audio coding framework, the proposed quantization and lossless coding method provide between 0.4 and 0.7 dB increase in signal-to-noise ratio over the E-8 lattice VQ and spherical lossless code used in the AMR-WB+ standard.

关键词： transform coded excitation trellis code

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Matched information rate codes for partial response channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2005年第3期51卷 973-989页

作者： Kavcic, A Ma, X Varnica, N Harvard Univ Div Engn & Appl Sci Cambridge MA 02138 USA

In this paper, we design capacity-approaching codes for partial response channels. The codes are constructed as concatenations of inner trellis codes and outer low-density parity-check (LDPC) codes. Unlike previous constructions of trellis codes for partial response channels, we disregard any algebraic properties (e.g., the minimum distance or the run-length limit) in our design of the trellis code. Our design is purely probabilistic in that we construct the inner trellis code to mimic the transition probabilities of a Markov process that achieves a high (capacity-approaching) information rate. Hence, we name it a matched information rate (MIR) design. We provide a set of five design rules for constructions of capacity-approaching MIR inner trellis codes. We optimize the outer LDPC code using density evolution tools specially modified to fit the superchannel consisting of the inner MIR trellis code concatenated with the partial response channel. Using this strategy, we design degree sequences of irregular LDPC codes whose noise tolerance thresholds are only fractions of a decibel away from the capacity. Examples of code constructions are shown for channels both with and without spectral nulls.

关键词： channel capacity concatenated codes density evolution low-density parity-check (LDPC) codes Markov capacity Markov processes partial response channel superchannel trellis code

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Study on a new-style probability decoder implemented by analog LSI 5

Study on a new-style probability decoder implemented by anal...

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5th International Conference on ASIC

作者： Yang, SH Qiu, YL CAS Ctr Microelect Beijing 100029 Peoples R China

ISBN: (纸本)078037889X

In this paper we design an analog multiplier by the MOS transistors working in the subthreshold mode. Using the multiplier as the core circuit, we design a famly of modules which can compute the probability by the current. On the basis of these modules, the pipelining serial-to-parallel interface, and the maximum a posteriori probability (MAP) algorithm, we implement a novel soft-decision analog probability decoder of the (5,2,3) trellis code. With the standard 0.6 mum CMOS technology we simulate and verify the analog decoder.

关键词： multiplier MAP soft-decision decoding trellis code analog decoder

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trellis based code combining protocols for Reed-Muller codes

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ELECTRONICS LETTERS 2000年第3期36卷 217-218页

作者： Martin, I Honary, B Univ Lancaster Commun Res Ctr Lancaster LA1 4YR England

A novel code combining system based on Reed-Muller codes is presented. Because of their simple structure RM codes are simple to decode using a trellis based soft maximum likelihood decoder (SMLD). The decoder exploits the modular structure of the RM code to construct a set of nested trellises which minimise the complexity of the decoder by re-using the results of previous decoding attempts. A protocol utilising this technique to produce an efficient code combining ARQ-scheme is also introduced.

关键词： Protocols protocols ARQ scheme Reed-Muller codes Reed-Muller code soft maximum likelihood decoder codes trellis codes trellis code maximum likelihood decoding protocol automatic repeat request

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Turbo decoding with run length limited code for optical storage

Turbo decoding with run length limited code for optical stor...

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International Symposium on Optical Memory (ISOM2001)

作者： Yamada, E Iwaki, T Yamaguchi, T Sharp Co Ltd Prod Technol Dev Grp Opt Disk Syst Dev Ctr Tenri Nara 6328567 Japan

A new turbo decoding method with a run length limited (RLL) code for optical storage is proposed. The system entails a trellis code that joins the RLL code, the non-return-to-zero inverse (NRZI) conversion, and the partial response (PR) channel as the inner code. The inner a posteriori probability (APP) decoder is able to utilize the extrinsic information fed back from the output of the outer decoder. A turbo-coded (1,7) RLL-constrained PR2 channel was simulated, The full, partial, and serial turbo decoding systems with the inner APP decoder achieved coding gains of 4.7 dB 4.3 dB, and 3.3 dB, respectively, over the uncoded (1, 7)RLL-constrained PR2 channel at a bit error rate (BER) of 10(-5). The full and partial turbos were also improved by 1.2 dB and 0.8 dB, respectively, over the partial turbo with the RLL soft-input soft-output (SISO) decoder at a BER of 10(-5).

关键词： turbo code RLL code trellis code PRML optical storage

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