On the performance of the access layer for the 4G wireless systems

Abstract

This project deals with the access layer in the wireless systems studying the performance of this layer for the 4th generation that pushed the CDMA from the physical layer to the access layer. For this purpose, a simulation of the performance of S-ALOHA and R-ALOHA, used as random access protocols in the access layer, was done when combined with CDMA as multiple access technique. In addition to that, the fading effect of the wireless channel was considered assuming a Rayleigh model. The simulation was done for four modulation techniques and showed that R-ALOHA had a better performance than S-ALOHA for high loads while BPSK was the best modulation technique for both protocols.