RETRANSMISSION STRATEGIES FOR MOVING NETWORKS OVER RICEAN FADING CHANNELS by

RETRANSMISSION STRATEGIES FOR MOVING NETWORKS OVER RICEAN FADING CHANNELS by Alex Ruiz Lee The problem of designing retransmission protocols based on Hybrid Automatic Repeat reQuest (HARQ) for moving networks over Ricean fading channels has been considered. The scenario of interest consists of one receiver traveling at a given speed while connected to a wireless network based on OFDM (e.g., WiMax) through several base stations located along the path. Five different retransmission protocols that combine HARQ with handover between adjacent base stations are considered. Their performance in terms of number of retransmissions per packet via numerical simulations, considering both frequency selective and nonselective channels are presented. The results obtained show the relevant advantage that can be achieved by the joint design of HARQ and handover, and by exploiting space-time transmit diversity and beamforming via softhandover. RETRANSMISSION STRATEGIES FOR MOVING NETWORKS OVER RICEAN FADING CHANNELS