In this study, variable active antenna spatial modulation (VASM) technique, which allows the selection of any number of antennas (but not a constant number of active antennas) to transmit a symbol at the same signalling interval, is presented. In the first step of the development of VASM, antenna selection method is determined to use the minimum number of transmit antennas. Complexity analysis of maximum likelihood decoder is given for the new scheme. In the second step, to reduce the correlation effect, a novel antenna selection method called VASM improved (VASMi) that minimises the pairwise error probability is introduced for exponentially correlated channels. For 6, 8, and 10 bit/s/Hz spectral efficiencies, bit error rates are obtained and compared with spatial modulation (SM) and generalised SM (GSM) for different antenna and signal constellation configurations. VASMi outperforms SM and GSM in both uncorrelated and exponentially correlated multiple-input multiple-output channels for similar antenna configurations.
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机译：在这项研究中，提出了可变有源天线空间调制（VASM）技术，该技术允许选择任意数量的天线（而不是恒定数量的有源天线）来以相同的信令间隔发送符号。在VASM开发的第一步中，确定天线选择方法以使用最少数量的发射天线。针对新方案给出了最大似然解码器的复杂度分析。在第二步中，为了减少相关影响，针对指数相关信道引入了一种称为VASM改进（VASMi）的新颖天线选择方法，该方法使成对错误概率最小。对于6、8和10 bit / s / Hz的频谱效率，可获得误码率，并将其与空间调制（SM）和通用SM（GSM）进行比较，以用于不同的天线和信号星座图配置。对于相似的天线配置，VASMi在不相关和指数相关的多输入多输出通道上均胜过SM和GSM。
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