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Three-Stage Serially Concatenated Codes and Iterative Center-Shifting K -Best Sphere Detection for SDM-OFDM: An EXIT Chart Aided Perspective

Record type: Conference or Workshop Item (Paper)

Abstract—Iterative K-best sphere detection (SD) and channel decoding is appealing, since it is capable of achieving a nearmaximum-a-posteriori (MAP) performance at a low complexity. However, a potentially excessive computational cost is imposed, especially in a high-throughput Spatial Division Multiplexing (SDM) aided OFDM system emloying a large number of transmit antennas and/or high-order modulation schemes. This problem is further aggravated, when the number of transmit antennas exceeds that of the receive antennas, namely in the challanging scenario of rank-deficient systems. In order to further reduce the complexity imposed, we propose a unity-rate-code-aided (URC) three-stage concantenated transceiver constituted by an inner and outer channel encoder/decoder pair as well as the SDM aided OFDM transmitter and K-best SD. We have demonstrated that our proposed three-stage scheme is capable of achieving a substantial performance gain over the classic two-stage scheme. For example, given a target Bit Error Ratio (BER) of 10?5, the three-stage SD-aided receiver is capable of achieving a performance gain of 4 dB over its two-stage counterpart in an (8×4)-element SDM/OFDM system. Furthermore, we have also investigated the achievable performance of our novel centershifting aided SD in the context of this three-stage scheme. Consequently, an additional 0.5 dB performance gain can be attained. Finally, the convergence behavior of the proposed schemes were studied with the aid of 3D EXtrinsic Information Transfer (EXIT) charts and their 2D projections.

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Citation

Wang, L, Xu, L, Chen, S and Hanzo, L (2008) Three-Stage Serially Concatenated Codes and Iterative Center-Shifting K -Best Sphere Detection for SDM-OFDM: An EXIT Chart Aided Perspective At IEEE WCNC'08, United States. 31 Mar - 03 Apr 2008. , pp. 611-615.

More information

Published date: April 2008
Additional Information: Event Dates: 31 March - 3 April 2008
Venue - Dates: IEEE WCNC'08, United States, 2008-03-31 - 2008-04-03
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 265403
URI: http://eprints.soton.ac.uk/id/eprint/265403
PURE UUID: fea0b3e9-ad08-4c6e-8cea-b7a687d07df3

Catalogue record

Date deposited: 08 Apr 2008 12:38
Last modified: 18 Jul 2017 07:26

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Contributors

Author: L Wang
Author: L Xu
Author: S Chen
Author: L Hanzo

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