Performance optimization of CSMA/CA based ad hoc networks

218 p.Ad hoc wireless networks introduce a number of challenges for protocol designers. Stations using such networks are constrained by factors such as limited bandwidth, link errors, and collisions. Changes are needed at various levels of the protocol stack, but most importantly at the Medium Access Control (MAC) layer. The medium access mechanism in multi-hop wireless networks should minimize collisions, and take care of the hidden and exposed node problems. It should also be flexible enough to allow all nodes to maximize the utilization of available bandwidth. Due to the broadcast nature of wireless transmission, when two hosts are communicating, all other hosts within the range of the two hosts must defer their communication in order to avoid collision. This results in significant throughput degradation as the number of active hosts increases. Studies have shown that wireless networks provide dismal capacity in the presence of many contending nodes in a given area.DOCTOR OF PHILOSOPHY (SCE