The effects of capture of CSMA local radio networks with BPSK modulation in Rayleigh fading channels

An analytical study of the packet capturing effect on the throughput of a carrier sense multiple access (CSMA) packet radio network over slow Rayleigh fading channels is presented. The effects of capture on the system are related to the modulation and coding technique, signal-to-noise ratio of the received signal, general terminal distribution in the area, and the length of the transmitted packets. The BPSK, coherent and noncoherent binary FSK modulations, and BCH coding are considered for the exact calculations. It was shown that the capture effect results in approximately 0.06 Erlang improvement in the performance of the CSMA packet radio networks in slow fading channels. This improvement is considerably less than the improvement of approximately 0.2 Erlang for the slotted Aloha. The throughput was shown to have minimal sensitivity to the length of the packet and the complexity of the coding technique