ABSTRACT
Ad hoc networks with omni-directional antennas use an RTS/CTS-based floor reservation scheme that wastes a large portion of the network capacity by reserving the wireless media over a large area. Consequently, lots of nodes in the neighborhood of transmitter and receiver have to sit idle, waiting for the data communication between transmitter and receiver to finish. To alleviate this problem, researchers have proposed to use directional (fixed or adaptive) antennas that direct the transmitting and receiving beams toward the receiver and transmitter node only. This would largely reduce radio interference, thereby improving the utilization of wireless media and consequently the network throughput.
