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Despite a power saving function IEEE 802.11 network interfaces still consume a vast amount of the overall energy budget of a self-sustained end system. Hence, further efforts are necessary to reduce the energy demand of an IEEE 802.11 network interface. In this paper several aspects of energy consumption and efficient utilization of limited energy resources of IEEE 802.11 communication systems are explored regarding the media access control protocol. The results measured for energy per goodput shows the impact of the packet size, the transmission rate, and RF power level. The results also show us how BER effects the energy consumption.