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Spatial Modulation is a newly developed concept for multi-antenna systems, which could greatly reduce the signal processing complexity and hardware implementation burden faced by these systems today. However, there are few works on the analysis of grouped Spatial Modulation, which has relatively large bit error rate(BER). In this paper, we propose a novel approach that the BER is approximatively calculated by the Chi square distribution and study the influence of the number of groups(K) at the sending end and the number of users(M) at the receiving end on the BER in the downlink of Rayleigh channels. When the number of groups(K) is increases while the number of users(M) is constant, the error performance is improved obviously. Finally, Monte Carlo Simulations is provided to verify the analytical results. Keywords—Spatial Modulation; precoders; error performance; MIMO

Error Performance Analysis of Zero Forcing Precoders for Spatial Modulation Broadcast Channels