In this paper, we analytically analyzed the impact of an error-prone channel over all performance measures in a trafficsaturated IEEE 802.11 WLAN. We calculated station's transmission probability by using the modified Markov chain model of the backoff window size that considers the frame-error rates and maximal allowable number of retransmission attempts. The frame error rate has a significant impact over theoretical throughput, mean frame delay, and discard probability. The peak throughput of a WLAN is insensitive of the maximal number of retransmissions. Discard probabilities are insensitive to the station access method, Basic or RTS/CTS.

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In this paper, we examined the influence of capture effect with L-fold antenna diversity at the Access Point over IEEE 802.11b DCF at 11 Mbit/s. We were able to obtain an exact closed-form solution for the conditional capture probability in case of L-fold ideal selection diversity, and an approximate closed-form solution for the conditional capture probability in case of L-fold maximum selection diversity in Rayleigh-faded channel. By using numerical integration, we calculated total frame capture probability vs. number of contending stations and capture ratio, and then analytically evaluated network saturation throughput of a single IEEE 802.11 BSS operating in Basic or RTS/CTS access methods.