Theoretical Aspects of Wireless LAN Performance

In the beginning of this chapter, a survey is given about existing literature concerning the performance ofWireless LAN and the enhancement by spectrum management. After this introduction, theoretical considerations about the capacity and the delay of IEEE 802.11 are discussed in detail starting with a model used in the literature. This model however applies to the case of an ideal, lossless channel, which means that the stations have infinite range, there is no attenuation of the signals on the path between the transmitter and the receiver. In this work, the model which has been introduced for the ideal channel is then extended for a more realistic channel by assuming an exponential attenuation of the signal and requirements for minimum signal levels and signal-to-noise-ratios (SNR) at the receivers. It is discussed how the results of these models apply for Transmit Power Control. Furthermore, novel considerations about the convergence speed of Dynamic Frequency Selection are given. The chapter concludes with calculations to compare the performance of a parallelised transmission for multiple users with a sequential transmission.