Abstract
This paper investigates the impact of using directional antennas and beamforming schemes on the connectivity of cognitive radio ad hoc networks (CRAHNs). Specifically, considering that secondary users use two kinds of directional antennas, i.e., uniform linear array (ULA) and uniform circular array (UCA) antennas, and two different beamforming schemes, i.e., randomized beamforming and center-directed to communicate with each other, we study the connectivity of all combination pairs of directional antennas and beamforming schemes and compare their performances to those of omnidirectional antennas. The results obtained in this paper show that, compared with omnidirectional transmission, beamforming transmission only benefits the connectivity when the density of secondary user is moderate. Moreover, the combination of UCA and randomized beamforming scheme gives the highest path connectivity in all evaluating scenarios. Finally, the number of antenna elements and degree of path loss greatly affect path connectivity in CRAHNs.
Highlights
Recent technological advances have results in the development of wireless ad hoc networks.These networks are composed of devices that are self-organizing and can be deployed without infrastructure support
We study the influence of directional antenna and beamforming schemes on the path connectivity between two random secondary users (SUs) in cognitive radio ad hoc networks (CRAHNs)
Inc., Natick, MA, USA) codes on a computer to investigate the effect of beamforming on the path connectivity in CRAHNs
Summary
Recent technological advances have results in the development of wireless ad hoc networks These networks are composed of devices that are self-organizing and can be deployed without infrastructure support. Recent studies highlight that a large percentage of licensed band remains unused because those spectrum bands are allocated through static assignment policies but only used in bounded regions or over a limited period of time. To deal with such bandwidth scarcity and inefficient bandwidth usage, the concept of cognitive radio (CR) has been recognized in [1] as an effective method
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