【摘要】 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。文章在对准正交空时分组码(QOSTBC)结构研究的基础上,提出了一种全速率的四发射天线准正交空时分组码,并给出了基于最大似然译码方法。仿真结果表明,文章方案与已有典型的Jafarkhani准正交空时分组码相比,在高信噪比时有更好的误码性能。更多还原

【Abstract】 According to the theory of orthogonal design,a complex orthogonal space-time block code that provides full diversity and full transmission rate could not be realized for more than two antennas.Based on quasi-orthogonal design,the space-time block codes that obtain full transmission rate may degrade the performance.This paper,by using the quasi-orthogonal design method,proposes a novel full rate space-time block code for four transmit antennas based on quasi-orthogonal design,including a maximum-likelihood(ML) decoding algorithm.Simulation results show that the scheme has better Bit Error Rate(BER) performance as compared to the existing typical codes at high SNR.更多还原