Full-Duplex Single-RF MIMO with Coordinate-Interleaved Space-Time Coding

In this paper, we aim at improving the transmission reliability of multiple-input multiple-output (MIMO) enabled full-duplex (FD) system. To this end, we investigate the implementation of coordinate interleaved orthogonal design (CIOD) based space-time block code in bidirectional FD system, and propose a novel scheme named CI-FD. Theoretical analysis proves that this scheme is able to achieve the full diversity gain of the CIOD technique when the self-interference (SI) of the FD system is effectively suppressed, while maintaining the same spectral efficiency and decoding complexity as the original FD system. Moreover, two performance enhancing schemes based on CI-FD are proposed: 1) CI-FD with antenna selection (AS) that further increases the diversity gain, and 2) CI-FD with spatial modulation (SM) that provides an additional spectral efficiency gain. Upper bounds on the average bit error probabilities of the proposed schemes are derived and their error-free information transmission capabilities are also investigated. Simulation results verify our analysis and demonstrate the advantages of the proposed schemes.