Spatially Coupled LDPC Coding and Linear Precoding for MIMO Systems

Zhonghao ZHANG; Chongbin XU; Li PING

doi:10.1587/transcom.E95.B.3663

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Spatially Coupled LDPC Coding and Linear Precoding for MIMO Systems

Zhonghao ZHANG, Chongbin XU, Li PING

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In this paper, we present a transmission scheme for a multiple-input multiple-output (MIMO) quasi-static fading channel with imperfect channel state information at the transmitter (CSIT). In this scheme, we develop a precoder structure to exploit the available CSIT and apply spatial coupling for further performance enhancement. We derive an analytical evaluation method based on extrinsic information transfer (EXIT) functions, which provides convenience for our precoder design. Furthermore, we observe an area property indicating that, for a spatially coupled system, the iterative receiver can perform error-free decoding even the original uncoupled system has multiple fixed points in its EXIT chart. This observation implies that spatial coupling is useful to alleviate the uncertainty in CSIT which causes difficulty in designing LDPC code based on the EXIT curve matching technique. Numerical results are presented, showing an excellent performance of the proposed scheme in MIMO fading channels with imperfect CSIT.

Publication: IEICE TRANSACTIONS on Communications Vol.E95-B No.12 pp.3663-3670

Publication Date: 2012/12/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E95.B.3663

Type of Manuscript: Special Section INVITED PAPER (Special Section on Coding and Coding Theory-Based Signal Processing for Wireless Communications)

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Zhonghao ZHANG, Chongbin XU, Li PING, "Spatially Coupled LDPC Coding and Linear Precoding for MIMO Systems" in IEICE TRANSACTIONS on Communications, vol. E95-B, no. 12, pp. 3663-3670, December 2012, doi: 10.1587/transcom.E95.B.3663.
Abstract: In this paper, we present a transmission scheme for a multiple-input multiple-output (MIMO) quasi-static fading channel with imperfect channel state information at the transmitter (CSIT). In this scheme, we develop a precoder structure to exploit the available CSIT and apply spatial coupling for further performance enhancement. We derive an analytical evaluation method based on extrinsic information transfer (EXIT) functions, which provides convenience for our precoder design. Furthermore, we observe an area property indicating that, for a spatially coupled system, the iterative receiver can perform error-free decoding even the original uncoupled system has multiple fixed points in its EXIT chart. This observation implies that spatial coupling is useful to alleviate the uncertainty in CSIT which causes difficulty in designing LDPC code based on the EXIT curve matching technique. Numerical results are presented, showing an excellent performance of the proposed scheme in MIMO fading channels with imperfect CSIT.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E95.B.3663/_p

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@ARTICLE{e95-b_12_3663,
author={Zhonghao ZHANG, Chongbin XU, Li PING, },
journal={IEICE TRANSACTIONS on Communications},
title={Spatially Coupled LDPC Coding and Linear Precoding for MIMO Systems},
year={2012},
volume={E95-B},
number={12},
pages={3663-3670},
abstract={In this paper, we present a transmission scheme for a multiple-input multiple-output (MIMO) quasi-static fading channel with imperfect channel state information at the transmitter (CSIT). In this scheme, we develop a precoder structure to exploit the available CSIT and apply spatial coupling for further performance enhancement. We derive an analytical evaluation method based on extrinsic information transfer (EXIT) functions, which provides convenience for our precoder design. Furthermore, we observe an area property indicating that, for a spatially coupled system, the iterative receiver can perform error-free decoding even the original uncoupled system has multiple fixed points in its EXIT chart. This observation implies that spatial coupling is useful to alleviate the uncertainty in CSIT which causes difficulty in designing LDPC code based on the EXIT curve matching technique. Numerical results are presented, showing an excellent performance of the proposed scheme in MIMO fading channels with imperfect CSIT.},
keywords={},
doi={10.1587/transcom.E95.B.3663},
ISSN={1745-1345},
month={December},}

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TY - JOUR
TI - Spatially Coupled LDPC Coding and Linear Precoding for MIMO Systems
T2 - IEICE TRANSACTIONS on Communications
SP - 3663
EP - 3670
AU - Zhonghao ZHANG
AU - Chongbin XU
AU - Li PING
PY - 2012
DO - 10.1587/transcom.E95.B.3663
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E95-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2012
AB - In this paper, we present a transmission scheme for a multiple-input multiple-output (MIMO) quasi-static fading channel with imperfect channel state information at the transmitter (CSIT). In this scheme, we develop a precoder structure to exploit the available CSIT and apply spatial coupling for further performance enhancement. We derive an analytical evaluation method based on extrinsic information transfer (EXIT) functions, which provides convenience for our precoder design. Furthermore, we observe an area property indicating that, for a spatially coupled system, the iterative receiver can perform error-free decoding even the original uncoupled system has multiple fixed points in its EXIT chart. This observation implies that spatial coupling is useful to alleviate the uncertainty in CSIT which causes difficulty in designing LDPC code based on the EXIT curve matching technique. Numerical results are presented, showing an excellent performance of the proposed scheme in MIMO fading channels with imperfect CSIT.
ER -