一种新的准正交空时分组码设计

The Design of a New Quasi-orthogonal Space-Time Block Codes

根据正交设计理论,当发送天线数大于2时,不存在可以获得完全分集增益和全速率的复正交空时分组码。对空时分组码采用准正交设计,能够保证数据以全速率传输,但是会使其误码性能降低。本文根据矩阵正交理论提出了一种新的全速率准正交空时分组码并给出了一种基于QR分解的最大似然译码方法。仿真结果表明,本文方案与已有典型的准正交空时分组码相比,具有更好的误码性能。

According to the theory of orthogonal designs, a complex orthogonal space-time block code that provides full diversity and full transmission rate is not feasible for more than two antennas. Based on quasi-orthogonal design, the space-time block codes that obtain full transmission rate may degrade the performance. According to the theory of orthogonal matrixes designs, this paper proposes a new rate-one space-time block code based on quasi-orthogonal design. And we also proposes a very low-complexity maximum- likelihood （ML） detection algorithm based on QR decomposition. Simulation results show that the scheme has better Bit Error Rate （BER） performance compared to the existing typical codes.