Abstract
In this paper, we investigate the uplink of a millimeter-wave (mmWave) communication system, in which the small base stations (SBSs) are densely placed. We assume that a user terminal (UT) can be served by multiple SBSs and propose a macro spatial modulation (M-SM) scheme, in which the indexes of the SBSs are used to carry part of UTs information. The performance of the proposed M-SM scheme is investigated and an energy based detection method with reduced computational complexity is also provided. In addition, considering that certain SBSs may have similar array manifold vectors, an adaptive mode selection scheme, in which the UT switches between two different modes, is presented to further improve the system performance. Numerical results are provided to verify the performance of the proposed scheme. It is shown that compared with the conventional communication scheme in which the UT only communicates with the SBS with a stronger channel, the proposed M-SM scheme can achieve better performance.
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