Abstract: Since Alamouti proposes the Space-Time Block Code（STBC）, the constructing methods of the STBC are researched widely. The studies show that the complex orthogonal STBC can not achieve full-rate for those systems with more than two receive antennas. The quasi-orthogonal STBC can get full-rate, but loses part of full-diversity. A full-rate full-diversity STBC, according to the rank criterion, is obtained by matrix rotation processing on the conventional quasi-orthogonal STBC. The numerical simulation results show that the BER performance of the full-rate full-diversity QOSTBC is improved 4 dB at least.

Key words: Space-Time Block Code（STBC）, full-rate, full-diversity, rank criterion, matrix rotation

摘要： 自Alamouti提出空时分组码以来，空时分组码的构造得到广泛的研究。研究表明，复正交空时分组码当发射天线数大于3时，它的传输码率小于1。准正交空时分组码虽然能达到全速率，却牺牲了一定的分集增益。根据空时编码秩准则，通过对传统准正交空时分组码进行矩阵旋转处理，得到一种全速率满分集的空时分组码。数值仿真显示，这种全速率满分集空时分组码的性能较传统准正交空时分组码至少有4 dB的提高。

关键词: 空时分组码, 全速率, 满分集, 秩准则, 矩阵旋转