改进高速率全分集准正交差分空时码方案

Improved High Rate and Full-diversity Quasi-orthogonal Differential Space-time Codes Scheme

传统的方案中,将准正交空时码(quasi-orthogonal space-time code)经过调制之后转换为酉空时码(unitary space-time code)再进行差分编码,但信息传输速率的提高会带来性能的严重下降。为了克服传统方案这一不足,给出一种引入幅值的修正方案,并且对幅值的选取也进行了说明。与传统的准正交差分空时码相比,所提方案提高了其信息传输速率,对误比特性能和信息传输速率进行了一个较好的折中。

In traditional scheme, the modulated quasi-orthogonal space-time code is converted to unitary space-time code before differential encoding. But the performance decreases seriously when the data transmission rate becomes higher. In this paper,a new scheme is proposed,in which the amplitude modulation information is added to overcome this disadvantage, and how to choose the amplitude is also introduced. As eompared with traditional differential space-time codes, the information transmission rate is improved in this scheme, and a good balance between hit error rate and information transmission rate is achieved.