协同通信中自适应准正交空时分组码的设计与性能分析

摘要

正交空时分组码作为空时编码的一种,在协同通信中能将空域分集和时域分集的优势同时发挥,使系统获得很好的性能改善.但是其最大的不足之处在于当天线数目大于2的时候不存在着编码速率为1的复码元构造.为了设计满速率码,提出了准正交空时码,其生成矩阵的子空间正交.结合自适应技术和准正交空时分组码,提出一种新的编码方案.在确保满速率传输的前提下,降低了译码时符号间的干扰,提高空时编码的性能,最后通过计算机仿真进行了验证.%Orthogonal space-time block code (OSTBC) improved the performance over cooperative wireless communication systems in terms of space and time diversity. However, OSTBC had no form of complex codes with the rate of 1 when the number of antenna was more than 2. In order to design codes with full-rate, quasi-orthogonal STBC (QO-STBC) was proposed, whose generator matrix was orthogonal between subspaces. Based on the combination of QO-STBC and self-adaptation technology, a new scheme of space-time coding is proposed which lowers the inter-symbol interference (ISI) and promotes the coding capabilities in the context of full-rate transmission. Finally, the new scheme through computational simulations is justifed.