Analysis of a multichannel wireless access protocol with non-instantaneous feedback under correlated fading

摘要

Throughput performance of a multichannel wireless access protocol with non-instantaneous feedback taking into account the effect of bursty packet losses, caused by a correlation in the multipath fading process is analyzed. M equal capacity orthogonal traffic channels are shared by N mobile users (M≤ N) on the mobile-to-base link. Based on the status (busy/idle) of the M receivers transmission attempts are made on the uplink. The BS (base station) broadcast the status in every slot on the downlink (base station-to-mobile link). A first order Markov model is used to describe the correlation in the packet success/failure process on a Raleigh fading channel. Using the above method., analytical expressions for the average throughput per channel are derived for a multichannel wireless access protocol with non-instantaneous feedback. The effects of Doppler bandwidth on the performance of the protocol with and without capture conditions are compared. For fixed values of N the single channel system perform better than the multichannel system, but for a fixed N/M ratio the multichannel system perform better than the single channel system.