An Efficiency Optimization Model for 802.11 Wireless Communication Channels

Abstract

In 802.11 data communications is often necessary to develop communication models in order to calculate the quality parameters and to develop adaptive communication techniques. The particularities of the radio communications make quite difficult to state a complete model due to different factors which act on the 802.11 throughput: radio interferences, channel overlap, variable SNR value, CSMA/CA medium access control techniques or legacy support. The main information reflecting the quality of a transmission channel is related with bit error rate, BER. The Bit Error Rate is depending on signal to noise ratio and is related to the employed modulation technique. For this reason it is useful to have a communication model starting from a given channel bit error rate, able to allow the calculation of channel efficiency and throughput. However, the most important advantage of this type of model is related with the possibility of defining adaptive algorithms for dynamic maximization of the QoS parameters, the throughput in particular. The paper is proposing an analytical model for AWGN communication channels efficiency optimization. The proposed model allows calculating the data packet length in order to obtain the best efficiency on a communication channel in terms of useful transferred data bits or throughput. The principle is useful in implementing adaptive communications. Ill. 8, bibl. 8, tabl. 2 (in English; abstracts in English, Russian and Lithuanian).