We consider a multi-user multiple-input multiple-output (MIMO) setup where full-duplex (FD) multi-antenna nodes apply linear beamformers to simultaneously transmit and receive multiple streams over Rician fading channels. The exact first and second positive moments of the residual self-interference (SI), involving the squared norm of a sum of non-identically distributed random variables, are derived in closed-form. The method of moments is hence invoked to provide a Gamma approximation for the residual SI distribution. The proposed theorem holds under arbitrary linear precoder/decoder design, number of antennas and streams, and SI cancellation capability.
@article{arxiv.1701.00277,
title = {Self-Interference in Full-Duplex Multi-User MIMO Channels},
author = {Arman Shojaeifard and Kai-Kit Wong and Marco Di Renzo and Gan Zheng and Khairi Ashour Hamdi and Jie Tang},
journal= {arXiv preprint arXiv:1701.00277},
year = {2017}
}