Comparison of Outage Performance between Precoding/Decoding Layouts in Multi-Hop MIMO Full-Duplex AF Relaying with Ideal Gain

Abstract

Recent technological advances with multiple antennas enable various options in rejecting interference in wireless communication systems. Multi-hop full-duplex (FD) multiple-input multiple-output (MIMO) relaying is coping with two kinds of interference: the self-interference (SI) from the transmitter (Tx) to the receiver (RX) at the same communication node as well as the crosstalk interference (CI, i.e., inter-relay interference) from the neighbor nodes. Regarding to the MIMO layout for rejecting the interferences, four cases are possible according to whether the precoder in Tx or the decoder in Rx try to reject the interferences. We in this paper provide outage probability for the multi-hop MIMO FD amplify-and-forward relaying according to the MIMO layouts and compare their outage performance with numerical investigation. The result shows that it is better to distribute the interference rejection capability between Tx and Rx than to let either of Tx and Rx remove both SI and CI.