基于准正交空时码的最优线性预编码矩阵设计
doi: 10.3724/SP.J.1146.2006.01123
Optimal Linear Precoding Design Based on the Quasi-Orthogonal STBC
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摘要: 为了充分利用信道信息改善应用准正交空时分组码的MIMO系统的性能，该文提出了将预编码矩阵和准正交空时分组码相结合的发射机制。信息在经过准正交空时分组码编码后，要经过线性预编码矩阵进行处理，才可以从发射天线发送。文中的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作为其最优设计准则。仿真结果表明，相对于未经过预编码矩阵的系统，新系统的误码率性能有明显改善。Abstract: For improving the performance of MIMO system with quasi-orthogonal STBC exploiting the channel knowledge, a new transmitter scheme combining the linear precoding matrix is proposed. Before sending out from the transmit antennas, the information is sent into the space-time encoder, then is processed by a precoder matrix. Exploiting the channel correlation and mean, the linear precoder is designed based on the Pair-wise Error Probability (PEP). Simulation results show that significant gain in BER of the new system can be obtained compared with the unprecoded system.
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