In wireless ad-hoc networks smart antenna techniques, capable of providing spatial reuse, longer ranges, interference suppression and other beneficial features, have been investigated to improve achievable performance and system capacity. Most works in current open literature focus on the design and development of MAC protocols and ignore the effect of co-channel interference along an active path from source to destination. To the best of our knowledge, there has been little work on the design of routing protocols for wireless ad-hoc networks using directional antennas.
In this work, a directional routing strategy has been proposed, mainly to suppress interferences from neighbouring relay nodes while attaining power effectiveness. The approach has been applied to two popular on-demand routing protocols, namely dynamic source routing (DSR)  and ad-hoc on-demand distance vector routing (AODV), which will be referred to as the directional DSR (DDSR) protocol and the directional AODV (DAODV) protocol.