Manifold Optimization-based Hybrid TX/RX Precoding for FD Relay mmWave Systems

We consider the rate of optimization of Millimeter wave (mmWave) full duplex (FD) relay MIMO systems via hybrid TX and RX precoding, contributing with a new design method based on manifold optimization. The proposed method is based on the adaptation of the manifold hybrid precoding scheme previously described for mmWave systems [1] to the FD relay set up, which unlike the latter, faces the additional challenge of mitigating self-interference (SI). In order to solve the latter problem, a zero space SI cancellation algorithm similar to the one recently proposed in [2] was incorporated. Results demonstrate that our proposed algorithm achieves near-optimal spectral efficiency, significantly outperforming the sate-of-the-art FD mmWave relay scheme offered in [3].