A new modified Gaussian approximation detector for space-time bit-interleaved coded modulation schemes

被引：0
|
作者：
Li, Ying [1 ]
Guo, Xudong [1 ]
机构：
[1] Xidian Univ, State Key Lab ISN, Xian 710071, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2007年 / 11卷 / 04期
基金：
中国国家自然科学基金;
关键词：
space-time bit-interleaved coded modulation; soft-input soft-output; Gaussian approximation; iterative decoding;
D O I：
10.1109/LCOM.2007.348297
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
To reduce the receiver complexity of the space-time bit-interleaved coded modulation(ST-BICM) scheme, this letter describes a turbo-type iterative structure consisting of a modified Gaussian approximation(MGA) detector and an a posteriori probability (APP) decoder. Utilizing the characteristics of the interleaving and the central limited theoretic, the MGA detector first assumes the superposition of the transmitted signals as a Gaussian random variable. Then, P most significant signal combinations are identified to calculate the log-likelihood ratio of each bit. Without any pre-process on the received signals, the proposed method is free of matrix inverse operation and can be applied in systems with more transmit antennas than receive antennas. Furthermore, the performance of the MGA approaches that of the optimal detection.
引用
收藏
页码：348 / 350
页数：3
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