Three-Stage Serially Concatenated Codes and Iterative Center-Shifting K -Best Sphere Detection for SDM-OFDM: An EXIT Chart Aided Perspective
Three-Stage Serially Concatenated Codes and Iterative Center-Shifting K -Best Sphere Detection for SDM-OFDM: An EXIT Chart Aided Perspective
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.
611-615
Wang, L
1aaf7ac6-9013-4a66-b5a6-15c50637d5d3
Xu, L
a758f3f2-c49a-487c-8f40-fc66b56d2c35
Chen, S
721af489-6f76-4a22-a932-50a37f2bdd67
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
April 2008
Wang, L
1aaf7ac6-9013-4a66-b5a6-15c50637d5d3
Xu, L
a758f3f2-c49a-487c-8f40-fc66b56d2c35
Chen, S
721af489-6f76-4a22-a932-50a37f2bdd67
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
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.
IEEE WCNC'08, United States.
31 Mar - 03 Apr 2008.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
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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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
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Date deposited: 08 Apr 2008 12:38
Last modified: 20 Jul 2019 01:26
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Contributors
Author:
L Wang
Author:
L Xu
Author:
S Chen
Author:
L Hanzo
University divisions
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