ABSTRACT
In this chapter, we will explore another advantage of directional antennas in estimating approximate location of nodes without using any additional hardware like GPS (global positioning system). We set up a testbed of ad hoc networks using directional antennas and demonstrated the effectiveness of directional tracking of the neighborhood of each node and subsequently location estimation of each node with respect to two reference nodes. This neighborhood tracking and location estimation not only help us in implementing directional MAC and directional routing protocols like location-aided routing, but also help us in applications involving location-based services where each node needs to know the approximate locations of other nodes in the network.
