Performance evaluation of mobile radio slotted ALOHA with fixed multibeam antennas

In this paper, we report our investigation into the effect of using fixed m ultibeam antennas on the performance of the slotted ALOHA protocol with cap ture in a mobile communications environment with Rayleigh and Log-normal fa ding. We consider the configuration where multiple receivers are present at each base station and calculate the rapture probability, its asymptotic va lue as the number of colliding packets tends to infinity, and throughput wh en multiple receivers ale used. The results demonstrate that by using fixed multibeam antennas, ne can achieve higher performance in terms of capture probability and throughput when compared to a conventional antenna system u sing the slotted ALOHA protocol.