Improved Iterative Receiver for Co-channel Interference Suppression in MIMO-OFDM Systems

Zhiting YAN; Guanghui HE; Weifeng HE; Zhigang MAO

doi:10.1587/transfun.E98.A.776

Improved Iterative Receiver for Co-channel Interference Suppression in MIMO-OFDM Systems

Zhiting YAN, Guanghui HE, Weifeng HE, Zhigang MAO

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Co-channel interference (CCI) is becoming a challenging factor that causes performance degradation in modern communication systems. The receiver equipped with multiple antennas can suppress such interference by exploiting spatial correlation. However, it is difficult to estimate the spatial covariance matrix (SCM) of CCI accurately with limited number of known symbols. To address this problem, this paper first proposes an improved SCM estimation method by shrinking the variance of eigenvalues. In addition, based on breadth-first tree search schemes and improved channel updating, a low complexity iterative detector is presented with channel preprocessing, which not only considers the existence of CCI but also reduces the computational complexity in terms of visited nodes in a search tree. Furthermore, by scaling the extrinsic soft information which is fed back to the input of detector, the detection performance loss due to max-log approximation is compensated. Simulation results show that the proposed iterative receiver provides improved signal to interference ratio (SIR) gain with low complexity, which demonstrate the proposed scheme is attractive in practical implementation.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E98-A No.2 pp.776-782

Publication Date: 2015/02/01

Publicized

Online ISSN: 1745-1337

DOI: 10.1587/transfun.E98.A.776

Type of Manuscript: LETTER

Category: Communication Theory and Signals

Authors

Zhiting YAN
  Shanghai Jiao Tong University
Guanghui HE
  Shanghai Jiao Tong University
Weifeng HE
  Shanghai Jiao Tong University
Zhigang MAO
  Shanghai Jiao Tong University

Keyword

iterative receiver, co-channel interference (CCI), spatial covariance matrix (SCM), max-log approximation

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Zhiting YAN, Guanghui HE, Weifeng HE, Zhigang MAO, "Improved Iterative Receiver for Co-channel Interference Suppression in MIMO-OFDM Systems" in IEICE TRANSACTIONS on Fundamentals, vol. E98-A, no. 2, pp. 776-782, February 2015, doi: 10.1587/transfun.E98.A.776.
Abstract: Co-channel interference (CCI) is becoming a challenging factor that causes performance degradation in modern communication systems. The receiver equipped with multiple antennas can suppress such interference by exploiting spatial correlation. However, it is difficult to estimate the spatial covariance matrix (SCM) of CCI accurately with limited number of known symbols. To address this problem, this paper first proposes an improved SCM estimation method by shrinking the variance of eigenvalues. In addition, based on breadth-first tree search schemes and improved channel updating, a low complexity iterative detector is presented with channel preprocessing, which not only considers the existence of CCI but also reduces the computational complexity in terms of visited nodes in a search tree. Furthermore, by scaling the extrinsic soft information which is fed back to the input of detector, the detection performance loss due to max-log approximation is compensated. Simulation results show that the proposed iterative receiver provides improved signal to interference ratio (SIR) gain with low complexity, which demonstrate the proposed scheme is attractive in practical implementation.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/transfun.E98.A.776/_p

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@ARTICLE{e98-a_2_776,
author={Zhiting YAN, Guanghui HE, Weifeng HE, Zhigang MAO, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Improved Iterative Receiver for Co-channel Interference Suppression in MIMO-OFDM Systems},
year={2015},
volume={E98-A},
number={2},
pages={776-782},
abstract={Co-channel interference (CCI) is becoming a challenging factor that causes performance degradation in modern communication systems. The receiver equipped with multiple antennas can suppress such interference by exploiting spatial correlation. However, it is difficult to estimate the spatial covariance matrix (SCM) of CCI accurately with limited number of known symbols. To address this problem, this paper first proposes an improved SCM estimation method by shrinking the variance of eigenvalues. In addition, based on breadth-first tree search schemes and improved channel updating, a low complexity iterative detector is presented with channel preprocessing, which not only considers the existence of CCI but also reduces the computational complexity in terms of visited nodes in a search tree. Furthermore, by scaling the extrinsic soft information which is fed back to the input of detector, the detection performance loss due to max-log approximation is compensated. Simulation results show that the proposed iterative receiver provides improved signal to interference ratio (SIR) gain with low complexity, which demonstrate the proposed scheme is attractive in practical implementation.},
keywords={},
doi={10.1587/transfun.E98.A.776},
ISSN={1745-1337},
month={February},}

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TY - JOUR
TI - Improved Iterative Receiver for Co-channel Interference Suppression in MIMO-OFDM Systems
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 776
EP - 782
AU - Zhiting YAN
AU - Guanghui HE
AU - Weifeng HE
AU - Zhigang MAO
PY - 2015
DO - 10.1587/transfun.E98.A.776
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E98-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 2015
AB - Co-channel interference (CCI) is becoming a challenging factor that causes performance degradation in modern communication systems. The receiver equipped with multiple antennas can suppress such interference by exploiting spatial correlation. However, it is difficult to estimate the spatial covariance matrix (SCM) of CCI accurately with limited number of known symbols. To address this problem, this paper first proposes an improved SCM estimation method by shrinking the variance of eigenvalues. In addition, based on breadth-first tree search schemes and improved channel updating, a low complexity iterative detector is presented with channel preprocessing, which not only considers the existence of CCI but also reduces the computational complexity in terms of visited nodes in a search tree. Furthermore, by scaling the extrinsic soft information which is fed back to the input of detector, the detection performance loss due to max-log approximation is compensated. Simulation results show that the proposed iterative receiver provides improved signal to interference ratio (SIR) gain with low complexity, which demonstrate the proposed scheme is attractive in practical implementation.
ER -