Simulation of Interference Avoidance in Cellular Digital Relay Networks using Dynamic Frequency Hopping

Abstract

Cellular Digital fixed Relay networks are new wireless system architecture based on integrating Digital Relay technique in the cellular networks to provide high data rate coverage. Therefore, interest has focused on solving the interference and multipath fading problems which introduce in system because of increasing the resources of signal in cell (Base station, Relays). This paper proposes Dynamic frequency hopping (DFH) as an interference avoidance technique for cellular Digital fixed Relay networks. The simulation of system contains applying Digital Relay and DFH techniques and focuses on the handoff process between Base station and Digital Relay. The simulation results compare the performance of system for two cases; with Relay-without DFH, and with Relay-with DFH. The results indicate that DFH can significantly improve the performance of system. The results show when the cluster size of system consists of seven cells the enhancement ratio is 83% in the blocking probability with high number of calls per hour and increase 15.38% in the number of users. When the cluster size of system consists of thirteen cells, the enhancement ratio is 85% in the blocking probability with high number of calls per hour and increase 15.38 % in the number of users.