On the Performance of Space-Time Block Coded Spatial Modulation Transmission for Full-Duplex Relay Networks

Focusing on the issue that the spatial modulation (SM)-aided full-duplex relaying (SM-FDR) scheme cannot obtain transmit diversity, we present a space-time block coded spatial modulation-based full-duplex relaying (STBC-SM FDR) protocol in this paper. In the proposed STBC-SM FDR transmission scheme, both the source and the destination nodes work in half-duplex (HD) mode, while the relay node works in full-duplex (FD) mode, and it forwards the information bits from the source via the STBC-SM codewords. We investigate the performance of the STBC-SM FDR scheme in terms of the bit error rate (BER) performance and capacity. Furthermore, a digital self-interference (SI) cancellation method based on null-space projection (NSP) and the orthogonality of the core STBC-SM is presented to enhance the performance of this scheme. Simulation results show that owing to achieving the second order transmit diversity, the proposed STBC-SM FDR protocol has obvious better BER performance than the SM-FDR scheme, and Monto Carlo simulation results also verify the validity of our theoretical analysis.