MOBILE RADIO SLOTTED ALOHA WITH CAPTURE, DIVERSITY AND RETRANSMISSIONCONTROL IN THE PRESENCE OF SHADOWING

In this paper, the capture performance of a random access scheme in th e presence of Rayleigh fading, shadowing and diversity is studied. The conditional throughput C-n, i.e., the average number of packets which are correctly received per slot, given the number of colliding packet s, n, is computed, as well as its limit as n --> infinity. Some differ ent diversity schemes are compared. Also, retransmission control is co nsidered as a means to enhance the system performance. The stability o f the controlled system is directly proved. Finally, the effect of lon g-term attenuations on the system performance and stability is discuss ed.