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This paper presents a new analytical model to compute the performance of the IEEE802.11 standards. The model is simple, but nevertheless exceedingly accurate, which can be used to compute the throughput and delay for all access mechanisms supported by the IEEE802.11 standard. These mechanisms include the distributed coordination function (DCF), the DCF with RTS/CTS, and the point coordination function (PCF). Using the new model, we provide an extensive throughput and delay performance evaluation of the above mentioned access mechanisms, in the assumption of noisy channel and finite number of terminals. In addition, the evaluation study took into account the impact of the presence of "hidden stations" and the possibility of "capture" on the performance of wireless networks.