Robust Transceiver Design for Full-Duplex Decode-and-Forward Relay-Assisted MIMO Systems

Robust transceiver design against unresolvable system uncertainties is of crucial importance for reliable communication. For instance, full-duplex communication suffers from such uncertainties when canceling the self-interference, since some residual self-interference (RSI) remains uncanceled due to imperfect channel knowledge. In this paper, we consider a MIMO relay system, where the considered decode-and-forward (DF) hybrid relay can operate in either half-duplex or full-duplex mode, and the mode changes adaptively depending on the RSI strength. We investigate a robust transceiver design problem, which maximizes the throughput rate of the worst-case RSI under the self-interference channel uncertainty bound constraint. Furthermore, we propose an efficient algorithm to obtain a local optimal solution iteratively.