新型准正交空时分组编码预编码的设计

为了改善准正交空时分组码的MIMO系统的性能，该文提出了将准正交空时分组码和预编码矩阵相结合的方法．信息在经过准正交空时分组码编码后，需经过线性预编码矩阵处理后才从发射天线发送，并且应用一种性能优于一般准正交编码的新型准正交分组码．预编码矩阵设计利用了MIMO信道的非零均值矩阵和相关矩阵，并采用成对差错概率（PEP）作为其最优设计准则．仿真表明，相对于未经过预编码矩阵的系统和一般准正交分组编码与预编码矩阵相结合的系统，新的编码方法的误码率性能有明显改善．

Pre-coding design based on the new quasi-orthogonal STBC

In order to improve the MIMO system performance of quasi-orthogonal space-time block codes, the authors proposed a method which combines the quasi-orthogonal space-time block codes and pre-coded matrix. After the quasi-orthogonal space-time block codes, the information has to be improved by the linear pre-coded matrix and then sent out through the transmitting antenna. And a new quasi-orthogonal block code which has better performance than the general application of quasi-orthogonal coding is applied in the design. The design of pre-coded matrix employs the average non-zero matrix and correlation matrix from MIMO channel, and the probability of error in pairs （PEP） as the optimal design criteria. Simulation shows that comparing to a non pre-coded matrix system and the general quasi-orthogonal coding which combines the pre-coded system, the bit error rate of the new system has been improved significantly.