Interference mitigation in Z-channel and relay-assisted Z-channel: a diversity gain region perspective

摘要

This work considers the interference management in Z-channel and full-duplex decode-and-forward (FD DF) relay-assisted Z-channel. In the case of Z-channel, closed-form expressions for the achievable diversity gain regions (DGRs) with both single-user (SU) codes and multi-user (MU) codes are presented. The closed-form expression for the achievable DGR of the clustered FD DF relay-assisted Z-channel with SU codes is also presented. In the Z-channel, if the interference-free receiver is constrained to operate at optimal diversity multiplexing tradeoff (DMT), the SU codes are shown to achieve better DGR than MU codes. Furthermore, in the Z-channel, the SU codes achieve DGR outer bound at low multiplexing gain region, and MU codes can never achieve DGR outer bound. Also, we have shown that Z-channel with two co-located antennas at the interfering transmitter achieves better DGR compared to that of the clustered FD DF relay-assisted Z-channel with single antenna at the interfering transmitter.