上行空时分组编码多载波码分多址系统的逐级干扰对消接收机算法

针对空时分组编码多载波码分多址系统的上行物理链路,提出了基于QR分解和基于最小均方误差的逐级干扰对消接收机算法。经算法处理后的数据矩阵保持了空时分组编码的正交结构,从而可以通过简单的线性处理实现空时分组编码的次优译码。与传统的置零接收机算法相比,此算法不会对接收机端的白噪声产生放大作用。计算机仿真结果表明,在独立衰落信道或相关衰落信道下,此算法均优于置零接收机算法。在误码率为10-6水平下,此算法比传统算法的信噪比改善约4dB。

Successive interference cancellation receiver algorithms for uplink STBC coded MC-CDMA systems

A QR decomposition based and a minimum mean square error (MMSE) based successive interference cancel-lation receiver algorithms were proposed for the uplink of space-time block coded multi-carrier code division multiple access (MC-CDMA) systems. As the processed data matrix preserved the orthogonal structure of space-time block code, the sub-optimum decoding could be achieved via simple linear processing. Compared with the traditional zero-forcing (ZF) receiver algorithm, the proposed algorithms avoid the enhancement of white noise power at the receiver. Simulation results demonstrate the proposed algorithms outperform the ZF receiver algorithm in both independent and correlated fading channels and they require 4 dB less signal-to-noise ratio than the traditional one for a bit error rate of 10?6.