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A differential spatial modulation (DSM) with binary phase shift keying (BPSK) scheme is designed for two-way relay (TWR) wireless communications that use the denoise-and-forward (DNF) protocol without requiring channel state information at the sources and relay. The key area to make this scheme work is a multiple-to-one mapping method for DSM at the relay, as well as the DSM matrix design at the sources,...
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