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中文摘要：
在传统的方案中,将准正交空时码（quasi-orthogonal space-time block codes）经过调制之后强行转换为酉空时码（unitaryspace-time codes）再进行差分编码.将调制方案进行改进,以使得码元之间的距离增大,以提高其编码增益,从而提高系统性能.与传统的准正交差分空时码相比,所提方案误码性能得以提高.
英文摘要：
In the traditional scheme,the modulated quasi-orthogonal space-time codes is transformed to be unitary space-time codes then the program of differential encoding could be constructed. Transforming the method of modulation,a new scheme is proposed to expand the code distance which could advance the codes diversity so as to enhance the performance. Compared with the traditional differential space-time codes,this scheme could increase the performance.
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