一种新的线性译码的准正交空时分组码方案

摘要

A conventional QO-STBC scheme can achieve the full rate, but at the cost of transmission diversity gain and decoding complexity. These disadvantages of the conventional QO-STBC scheme are mainly a result of interference terms in the detection matrix. In order to solve the problem, this paper proposes a new QO-STBC scheme which transforms the original detection matrix into a diagonal matrix using Givens rotation algorithm and eliminates interference terms. The proposed method achieves improved diversity gain with respect to the conventional QO-STBC scheme, as well as a great reduction in decoding complexity by means of a linear decoding algorithm. Simulation also shows the superiority of the proposed scheme.%传统的准正交空时分组码可以实现全速率传输,但是不能获得最大的发送分集增益,而且译码复杂度相对较高,这主要是由于检测矩阵中存在干扰项造成的.为了解决这个问题,本文提出了一种新的准正交空时分组方案,该方案通过利用Givens旋转运算,将检测矩阵变换为一个对角阵,消除其中的干扰项,使得接收端可以采用线性方法来译码,从而既提高了系统的分集增益,又降低了译码的复杂度.仿真实验也验证了所提方案的优越性.