Multiple-User Full-Duplex Hybrid Beamforming Design for mmWave Systems with a Joint Interference Cancellation Design

With the continuous growth of capacity demand, millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO) systems have been considered as one of the primary research focuses of the next sixth generation (6G) wireless communication networks. Full-duplex (FD) technology can further enhance the capacity of mmWave massive MIMO systems. However, the strong self-interference (SI) and inter-user interference (IUI) severely limit the performance of multiple-user (MU) FD mmWave massive MIMO systems. In this paper, a hybrid beamforming (HBF) scheme with joint optimization is proposed for MU FD mmWave massive MIMO systems. The Lagrange multiplier method is adopted to minimize the interference energy. Then, considering the power consumption problem of massive MIMO systems at the base station (BS), the beamforming matrixes are decomposed into analog and digital parts based on the manifold optimization-alternating minimization (MO-AltMin) algorithm. Simulation results show that the proposed system has made good achievements in interference cancellation.