一种简单的V-BLAST迭代算法

理论和实践研究表明贝尔实验室垂直分层空时码(V-BLAST)可显著提高多天线系统的传输容量.传统的V-BLAST译码算法是排序连续干扰抵消算法(OSIC),然而由于数据层间误码传播的影响,OSIC并不能有效地提高整个系统的分集增益.利用最近提出的迭代V-BLAST译码算法,低分集增益数据层通过高分集增益数据层的判决反馈来迭代检测,整个系统的性能得到提高.但这种算法的迭代次数高,迭代的次数与MIMO系统中发射天线的数量相等.为了减少系统实现的复杂性,提出了一种新的迭代的V-BLAST译码算法.仿真结果证明在对称系统中(接收天线和发射天线数相等),新算法与传统V-BLAST译码算法相比性能有了很大提高.

A Simple Iterative Detection Algorithm for V-BLAST

The Vertical Beil Laboratories Layered Space-Time (V-BLAST) is a multiple transmit and receive antenna system that provides very high capacity comparing to single antenna systems. Traditional detection algorithm for V-BLAST is based on Order Successive Interference Cancellation (OSIC),the error propagation resulting from the low-diversity substreams constraints the overall system performance greatly using the OSIC algorithm. Using the algorithm that low-diversity substreams are iteratively decoded by using decisions form high-diversity substreams the performance is highly improved over the traditional one, but this algorithm needs too much iterative detection. For example, to the MIMO system with n transmit antennas the number of iterative detection are equal to n. To solve the problem of high complexity, a new iterative detection is proposed. For symmetric system where there is an equal number of transmit and recieive antennas simulation results show that there is a significant performance improvement comparing to the V-BLAST Order Successive Interference Cancellation (OSIC).