Performance of slotted ALOHA with spread spectrum and delay capture

Packet reservation multiple access (PRMA) is a channel access protocol proposed for the third generation wireless information networks which have attracted considerable attention. The application of the slotted ALOHA random access technique to a system using a spread spectrum waveform is described and analyzed. The technique takes advantage of the delay capture properties of spread spectrum waveforms. The system has been modeled as a Markov chain and some important performance measures such as system throughput, and average channel access delay of packets are formulated, which show excellent delay and throughput performance are achieved. System stability is maintained even in the face of the effects of severe fluctuations in user population on traffic loading such as may occur in a large population of mobile users.