分布式MIMO的Turbo检测算法

沈莹; 唐友喜; 孔婷

分布式MIMO的Turbo检测算法

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出版历程
- 收稿日期: 2005-03-28
- 修回日期: 2005-12-12
- 刊出日期: 2006-12-19

Turbo Detection Scheme for Distributed MIMO

摘要

摘要: 当信道码为卷积码时，针对V-BLAST类空时码的分布式MIMO，该文提出了两种迭代检测算法：最大似然迭代接收机及一种低复杂度的迭代检测接收机。最大似然迭代检测接收机的复杂度为O(2MTSlogM)，低复杂度的迭代检测接收机的复杂度为 O(M2TM2RS2M) 。在准静态、单径瑞利衰落信道中，对低复杂度的迭代检测接收机的误码率性能进行了计算机仿真验证，与非迭代的迫零检测相比，低复杂度的迭代检测接收机节约比特信噪比约7.5dB；在相同的误码率下，迭代6次与迭代1次相比，可节约3dB的比特信噪比；随着迭代次数的增加，迭代效果越来越小。
- 分布式多输入多输出; Turbo(迭代)检测; 软输入软输出; 并行软干扰抵消; 瞬时最小均方误差滤波; 信道传播时延
Abstract: In this paper, a iterative receiver is introduced for convolutionally coded distributed MIMO with V-BLAST architecture. A maximum-likelihood (ML) iterative detector and a low-complexity Turbo detection scheme are proposed. The computational complexity is O(2MTSlogM) and O(M2TM2RS2M) respectively. Simulation results in quasi-stationary, single-path Rayleigh fading channel demonstrate that the proposed low-complexity iterative detection algorithm offers significant performance improvement about 7.5dB at than the non-iterative zero-forcing detection. At same BER (Bit Error Rate), 1 iterations Eb/N0 is 3dB above 6 iterations. Performance improvement gradually declines as the number of iteration increases.

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