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Joint maximum likelihood detection and link selection for cooperative MIMO relay systems

IET COMMUNICATIONS 2014年第14期8卷 2489-2499页

作者： Hesketh, Thomas de Lamare, Rodrigo C. Wales, Stephen Univ York Dept Elect Commun Res Grp York YO10 5DD N Yorkshire England Pontificia Univ Catolica Rio de Janeiro Ctr Studies Telecommun BR-22453900 Rio de Janeiro Brazil Roke Manor Res Ltd Romsey SO51 0ZN Hants England

In this study, the authors propose a cross layer design strategy that consists of a cooperative maximum likelihood detector operating in conjunction with link selection for cooperative multiple-input multiple-output relay networks. The system considered is a two phase relaying model, with amplify-and forward relays. The model considers the effect of relay placement and of large scale shadowing. The authors develop a cooperative maximum likelihood detector for an arbitrary number of relays, and link selection schemes are devised for two scenarios relating to the available knowledge at the destination node, which considers relay combination, with complexity analysis. The authors also propose a cooperative list sphere decoder that processes soft information and implements an iterative detection and decoding scheme. The results of simulations of the systems are presented, with comparisons to system models used in previous literature, and show how the cooperative detector and the proposed link selection schemes affect the bit error rate performance at the destination node, for both the hard decision non-iterative case, and the soft information iterative processing case.

关键词： MIMO communication relay networks (telecommunication) maximum likelihood detection radio links cooperative communication amplify and forward communication iterative decoding soft information iterative processing case bit error rate performance iterative decoding scheme iterative detection cooperative list sphere decoder link selection schemes relay placement amplify-and forward relays two phase relaying model cooperative multiple-input multiple-output relay networks cross layer design strategy cooperative MIMO relay systems maximum likelihood detection

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Rate one-half code for approaching the Shannon limit by 0.1 dB

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ELECTRONICS LETTERS 2000年第15期36卷 1293-1294页

作者： ten Brink, S Univ Stuttgart Inst Telecommun D-70569 Stuttgart Germany

A serially concatenated code is presented which exhibits a turbo cliff at 0.28dB. The concatenation consists of an outer rate one-half repetition code and an inner rate one recursive convolutional code. The iterative ... 详细信息

关键词： Shannon limit convolutional codes rate one-half code iterative decoding scheme extrinsic information transfer chart serially concatenated code turbo cliff concatenated codes decoding recursive convolutional code turbo codes

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EXIT functions for binary memoryless symmetric channels

EXIT functions for binary memoryless symmetric channels

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IEEE International Symposium on Information Theory

作者： Sharon, E Ashikhmin, A Litsyn, S Tel Aviv Univ Dept Elect Engn IL-69978 Tel Aviv Israel

ISBN: (纸本)0780382803

Use of Extrinsic Information Transfer (EXIT) functions characterizing mutual information between the input and output of constituent decoders significantly facilitates performance analysis of iterative decoding schemes. Previously EXIT functions derived for Binary Erasure Channel (BEC) were used as an approximation for other Binary Memoryless Symmetric (BMS) Channels. Here we improve on this approach by introducing a more accurate method to compute EXIT functions of some block codes for BMS channels. A general expression is derived for the Extrinsic Mutual Information at the output of MAP decoder. Using this expression we are able to compute EXIT functions for single parity-check codes over all BMS channels. Application of this result to analysis of convergence thresholds of LDPC codes is described. Using an alternative decoder coinciding with MAP decoder over BEC, we derive an expression for EXIT function over BEC, and based on it approximation to the EXIT function over AWGN channel for some block codes.

关键词： iterative decoding memoryless systems block codes maximum likelihood decoding parity check codes AWGN channels extrinsic information transfer EXIT function mutual information iterative decoding scheme binary memoryless symmetric channel BMS block code MAP decoder low density parity-check code LDPC code AWGN channel low density parity check codes AWGN channels Block codes maximum likelihood decoding memoryless systems parity check codes iterative decoding Information Transfer decoders

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iterative detection and decoding for SCMA systems with LDPC codes

Iterative detection and decoding for SCMA systems with LDPC ...

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International Conference on Wireless Communications and Signal Processing

作者： Baicen Xiao Kexin Xiao Shutian Zhang Zhiyong Chen Bin Xia Hui Liu Dept. of Electron. Eng. Shanghai Jiao Tong Univ. Shanghai China

ISBN: (纸本)9781467376884

Sparse code multiple access (SCMA) is a promising multiplexing approach to achieve high system capacity. In this paper, we develop a novel iterative detection and decoding scheme for SCMA systems combined with Low-density Parity-check (LDPC) decoding. In particular, we decompose the output of the message passing algorithm (MPA) based SCMA multiuser detection into intrinsic part and prior part. Then we design a joint detection and decoding scheme which iteratively exchanges the intrinsic information between the detector and the decoder, yielding a satisfied performance gain. Moreover, the proposed scheme has almost the same complexity compared with the traditional receiver for LDPC-coded SCMA systems. As numerical results demonstrate, the proposed scheme has a substantial gain over the traditional SCMA receiver on AWGN channels and Rayleigh fading channels.

关键词： AWGN channels Rayleigh channels fading channels iterative decoding parity check codes subcarrier multiplexing LDPC codes LDPC decoding Rayleigh fading channels SCMA multiuser detection SCMA systems intrinsic information iterative decoding scheme iterative detection iterative detection scheme low-density parity-check message passing algorithm multiplexing approach sparse code multiple access Complexity theory decoding Detectors iterative decoding Multiuser detection Receivers AWGN channels Raleigh fading channels low density parity check codes iterative decoding decoding Multiuser detection parity check codes subcarrier multiplexing Complexity theory Receivers Fading channels decoding scheme message passing detector

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