Spatial modulation is an efficient transmission scheme for RF-chain limited MIMO systems. In this paper, we design a beam-switching based spatial modulation for mmWave MIMO uplink systems. At user side, a power iteration based algorithm is proposed to generate spatial symbols under the constant modulus constraint. With the generated spatial codebook, the optimal transmission mode is determined. At base station side, a round-robin path selection algorithm is proposed to select paths that are separated in angle of arrival. Inter-user interference is then suppressed by constraining the power of the received spatial symbols over selected paths only. Finally, ordered successive interference cancelation is applied to further reduce interference among users. Numerical results show that the proposed beam-switching based spatial modulation is superior to transmission over the strongest propagation path and is able to yield a satisfactory error performance in mmWave MIMO uplink.

中文翻译：

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具有混合结构的上行链路多用户毫米波 MIMO 系统的空间调制

空间调制是射频链受限 MIMO 系统的有效传输方案。在本文中，我们为毫米波 MIMO 上行链路系统设计了一种基于波束切换的空间调制。在用户侧，提出了一种基于幂迭代的算法来生成恒模约束下的空间符号。利用生成的空间码本，确定最佳传输模式。在基站侧，提出了一种循环路径选择算法来选择到达角分离的路径。然后通过仅约束所选路径上接收到的空间符号的功率来抑制用户间干扰。最后，采用有序连续干扰消除，进一步降低用户间的干扰。