Probability of Outage in Multiple Access Spread Spectrum Systems Due to Autointerference

A method is presented for evaluating the probability of outage due to auto-interference in multiple access radio systems using a spread-spectrum modulation technique. While spatial, frequency of transmission and activity distributions are computer simulated for each radio, the novelty of the method consists of considering a log-normal field strength distribution for each interfering radio. The algorithm has a very simple implementation and it allows evaluation of the probability of outage for different modulation techniques. Here, a comparison between an asynchronous frequency-hopping and a hybrid frequency-hopping/direct sequence modulation schemes is shown.