Outage probability of cellular mobile radio systems employing a selective co-channel interference cancellation scheme

摘要

This article first presents a general numerical procedure for computing the probability of outage of a cellular mobile radio system that is equipped with a smart antenna to suppress a few strongest co-channel interferers out of a total of N/sub 1/ active interferers by adaptive null-steering. Aside from the interference-limited case, refined outage criterions that either treat receiver noise as co-channel interference (CCI) or consider a minimum detectable receiver signal threshold are studied. Exact closed-form formulas for both the basic and refined outage criterions are also derived by assuming that all the CCI signals are subject to Nakagami-m fading (positive integer fading index). Selected numerical examples are provided to illustrate the application of the theory which include the investigation into the effects of fade distribution of the CCI signals and traffic loading on the outage probability, and also the study of spectrum utilization efficiency improvement using a selective co-channel interference nulling technique.