Multiuser MIMO Downlink Transmission Using SSK and Orthogonal Walsh Codes

摘要

This paper proposes a novel scheme to transmit signals in a downlink multiuser multiple input-multiple output scenario. The proposed scheme combines spatial shift keying modulation and orthogonal Walsh codes. Analytical and simulation results show that the proposed scheme has performance gains of 10-11 dB for an average bit error probability of 10(-3) when compared to the conventional channel inversion scheme. In addition, it has the advantage of not requiring channel state information in the transmission whereas only a single RF chain is used. Compared with the previous MU-SM scheme, the proposed scheme has performance loses of 4-5 dB approximately; however the detection complexity is reduced up to 93 % for the analyzed cases.