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Currently two projects are on their way to standardize physical layer and medium access control for wireless LANs – IEEE 802.11 and ETSI RES 10 Hiperlan. This paper presents an introduction to both projects focussing on the applied access schemes. Further we will present our simulation results, analyzing the performance of both access protocols depending on the number of stations and on the packet size, evaluating them regarding their capability to support QoS parameters, regarding the impact of hidden terminals and their range extension strategy.