Analysis of low complexity uplink/downlink full-duplex wireless access with spatially random nodes

The authors consider a cellular wireless system where multiple antenna full-duplex base stations (BSs) communicate with single antenna half-duplex spatially random users to support simultaneous uplink/downlink transmissions. Leveraging recent applications of stochastic geometry to analyse cellular systems, this study proposes to study the antenna selection problem for full-duplex BSs. In particular, they investigate max-max antenna selection (MM-AS) and loopback-interference antenna selection (LI-AS) schemes to select a single transmit and receive antenna at BSs. They develop new outage probability expressions for both downlink and uplink transmissions of the proposed antenna selection schemes to investigate network throughput. The authors' analysis shows interesting performance comparisons of the proposed antenna selection schemes for different system parameters. The LI-AS scheme outperforms the MM-AS scheme at uplink, whereas the opposite trend is observed at downlink direction. Moreover, it is demonstrated that the LI-AS scheme can ensure a balance between maximising the network throughput and maintaining an acceptable uplink/downlink transmission fairness level.