Conference Paper

Evaluation of soft detection of STBC schemes for turbo codes.

DOI: 10.1109/WIMOB.2010.5644863 Conference: IEEE 6th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2010, Niagara Falls, Ontario, Canada, 11-13 October, 2010
Source: DBLP

ABSTRACT In this paper, we present an efficient turbo-coded space time block coding (STBC) schemes in block fading channels. It has been reported that proper utilization of soft decision information is one of the important factors affecting the performance of turbo codes. If a STBC scheme is used with turbo codes, the output of the STBC decoder must be fed into a turbo code decoder in the form of soft decision information. In addition, the performance of a turbo code is subject to how much diverse channel information a decoder can utilize in a codeword. In this paper we evaluate the performance of turbocoded STBC schemes over block fading channels, and present an efficient STBC scheme with very simple maximum likelihood detection capability.

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    ABSTRACT: "Supervisor, Assistant Professor Guan Yong Liang." Thesis (Ph.D.) -Nanyang Technological University, School of Electrical and Electronic Engineering, 2006.
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    ABSTRACT: The space-time bit-interleaved coded modulation (ST-BICM) is an efficient technique to obtain high diversity and coding gain on a block-fading multiple-input multiple-output (MIMO) channel. Its maximum-likelihood (ML) performance is computed under ideal interleaving conditions, which enables a global optimization taking into account channel coding. Thanks to a diversity upper bound derived from the Singleton bound, an appropriate choice of the time dimension of the space-time coding is possible, which maximizes diversity while minimizing complexity. Based on the analysis, an optimized interleaver and a set of linear precoders, called dispersive nucleo algebraic (DNA) precoders are proposed. The proposed precoders have good performance with respect to the state of the art and exist for any number of transmit antennas and any time dimension. With turbo codes, they exhibit a frame error rate which does not increase with frame length.
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    ABSTRACT: A comparison in the performance between hard- and soft-decision Viterbi decoding, with application to the HIPERLAN/2 standard, is presented. The results show that when channel state information (CSI) is included in the generation of the soft-decision information, the soft-decision method greatly outperforms the hard method. Moreover, a simplified algorithm for the soft-output demapper for the 16-QAM and 64-QAM constellations is developed, which allows the complexity of the demapper to be maintained at almost the same level for all the possible modes of HIPERLAN/2.
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