基于分层空时结构的多码CDMA系统中一种新的迭代均衡接收算法的研究

A novel turbo-equalization algorithm for multicode CDMA with V-BLAST architecture

为了提高基于垂直结构的分层空时结构(V-BLAST, vertical bell-laboratories layered space-time)的多码 CDMA 系统的抗干扰能力与系统容量,文章提出了一种将 MMSE 均衡与 Turbo 译码联合运算进行的方法,得到了一种针对该系统的迭代均衡接收算法。该接收算法包含两个连续的软输入软输出模块,首先经过 MMSE 均衡后得到第一个软输出,然后从 Turbo 译码器得到第二个软输出。每一次迭代过程中,从均衡和译码中得到的外赋信息作为第二次迭代的先验信息。仿真结果表明,文章提出的迭代均衡接收算法相比较传统非迭代接收算法,性能有非常可观的改善。

To suppress the interference and improve capacity of multicode CDMA with V-BLAST architecture, a novel method of joint MMSE equalizer and Turbo decoding was proposed in this paper. Also, a novel Turbo equalizer structure was obtained. The receiver performs two successive soft input soft output, first from a MMSE equalizer and then from a Turbo decoder and was used as a priori information for the next iteration. Simulation results demonstrate that the proposed Turbo equalizer offers significant performance gain over traditional non-iterative receiver structures.