Kun Liu1, Amr Youssef2 , and Walaa Hamouda1
Department of Electrical and Computer Engineering
2Concordia Institute for Information Systems Engineering Concordia University
Montreal, Quebec, HEG 1M8, Canadae
Several recently proposed directional MAC proto-cols for mobile ad hoc networks incorporate the
positions of the destination stations, as well as the interfering ones, in the beamforming process at
each mobile station. Assuming perfect node position estimation, these protocols have shown to
provide a significant throughput improvement relative to the existing omni-directional protocols.
When perfect node position information is available, it was noticed that increasing the number of
antenna elements can play an important role in improving the total system throughput for these
directional MAC protocols.
We investigate the effect of inaccurate node position estimation on the throughput of these
protocols over both Gaussian and Ricean fading channels. Our results show that, in contrary to the
ideal case, as the position estimation error increases, the system throughput dramatically decreases
with the number of antennas.