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给出了几个关于非相干多输入输出系统的新的编码.在高信噪比的情况下,非相干空时编码问题等价于在格拉斯曼流型上的存储问题;通过指数映射,它被进一步简化成相干情况下的多输入输出系统的空时编码问题.在相干和非相干编码中,对于每个信号的平均发送功率有不同的考虑.通过改造已有的相干空时编码或者选择新的信号设计,我们构造出一些新的非相干空时编码.模拟计算表明,新码有更好的表现.与此同时,新码也全部运用了系统自由度.这意味着它们具有高光谱效率.
Several new coding schemes are given for incoherent MIMO systems.In the case of high signal-to-noise ratio, the problem of non-coherent space-time coding is equivalent to the storage problem in the case of the Grassmannian flow pattern. By exponential mapping, It is further reduced to the space-time coding problem of coherent MIMO systems. In coherent and incoherent coding, the average transmit power of each signal is considered differently. By modifying the existing coherent space-time coding or With the new signal design, we construct some new non-coherent space-time codes, and the simulation shows that the new codes have a better performance, while the new codes also make full use of the system’s freedom, which means they have high Spectral efficiency.