OFDM BASED CHANNEL ADAPTIVE MULTIPATH ROUTING IN WIRELESS MOBILE AD-HOC NETWORKS

Abstract: A Wireless Mobile Ad-hoc Network can be used for wide range of application as it has the capability to establish network anywhere, any time without any infrastructure. In MANETs packet transmission is affected by radio link fluctuations. Hop count is a simple routing metric that calculate the distance between a source and destination on the number of routers in the path. Routing protocols for ad hoc networks have less channel fading. The minimum hop count is not enough for a routing protocol to achieve a good performance. So in this paper, channel adaptive protocol using OFDM technique, extensions to a multipath routing protocol to accommodate channel fading is introduced. The resulting protocol is referred to as Channel Adaptive Multipath routing protocol (CAMR). Using channel state information (CSI), a pre-emptive handoff strategy is applied to maintain reliable and stable connections. Paths are reusable, rather than simply regarding them as useless. In this paper we provide theoretical analysis of multiple path system, as well as comparison between CAMR and AOMDV. We also show that there is a close match between the theoretical and the simulation results which confirms the improved network performance of CAMR over AOMDV

Keywords: channel adaptive routing, route handoff, routing protocols, channel fading