A Fine-Grained Performance Analysis for Multi-Antenna Multi-User Networks with Interference Nulling

This paper proposes a fine-grained performance analysis framework for multi-antenna multi-user networks with interference nulling (IN), where the success probability (SP), the variance of link reliability, and the signal-to-interference ratio (SIR) meta distribution are studied as the metrics for system performance evaluation. With these three metrics, the average performance, the fairness of the individual links, and the link reliability distribution in the network can be respectively investigated. Two IN schemes, namely, fixed IN (FxIN) scheme and flexible IN (FlIN) scheme are studied using the framework. First, the expression of SP for each scheme is derived by using stochastic geometry analysis techniques. Then, the approximate expressions for the first and second moments on the link reliability are obtained, with which the variance of link reliability as well as the approximation of the SIR meta distribution for each scheme is derived. Finally, the performance of the two IN schemes are compared within the framework. It is shown that the FlIN scheme always provide higher fairness among individual links compared to the FxIN scheme. Nevertheless, the superiority of the SP and the SIR meta distribution of the two schemes are dependent on the system parameter design.