An analysis of nonpersistent CSMA with power capture in wireless star-like networks

Abstract

Presents a model and analysis of asynchronous nonpersistent CSMA on a single-hop wireless network with a base station (e.g. the CDPD system), assuming power capture at the receiver. Power capture is a very important problem in wireless networks. A space-time model, which is more accurate than models in previous analyses, is used to track events in the network. Three capture models, yielding an upper and lower bounds on the throughput, are analyzed. Propagation loss and Rayleigh fading are assumed in capture models. Numerical and simulation results are obtained and discussed for different values of maximum normalized propagation delay and the capture ratio. In particular the authors show that the throughput for the lower bound model is very tight. In addition, they show that fading, combined with propagation loss, improves the network throughput.