莱斯快衰落信道下差分酉空时调制的性能

无线衰落信道的快速时变给空时调制和编码算法带来极大的难度,该文将一个信道分为常数镜像部分和时变漫射部分,在此基础上,借助AR模型讨论其中漫射信道系数的逐符号变化。随着SNR的增大,对系统性能起主要影响的是信道的变化。借助平方酉信号和AR模型,推导出在时变信道下存在一个SNR极限,并给出这个极限的具体值。同时,借助SNR极限和基本差分表达式,给出差分调制下成对误差概率的近似表达式。最后,给出一些相应的仿真,对上述推导进行验证。

Performance of Differential Unitary Space-Time Modulation on Rician Fast-Fading Channels

Rapid temporal variations in wireless channels pose a significant difficulty for space-time modulation and coding. A channel was divided into a constant specular component and a time-varying diffuse component. Based on this, AR (Auto Regress) model was used to discuss the symbol to symbol variation of the diffuse channel coefficients. As the SNR increases, the systems performance was mainly dominated by the changing channels. An SNR floor over a time-varying channel was derived with the square unitary signals and AR model, and a detailed value of it was shown. Meanwhile, the approximate equation of pairwise probability of error was shown with SNR floor and basic differential expression. Ultimately, some simulation results were provided to support the analysis.