Adjacent channel rejection in OFDM wireless local area networks

Abstract

Wireless communication networks are subject to a variety of interference signals, some of which emanate from bands adjacent to the signal of interest. Sidelobe emissions from adjacent band interferers leaks into the bandwidth of the signal of interest. Incomplete removal of frequency components due to the use of non-ideal filters could also cause distortion due to aliasing affects. In this paper, we study the effect of adjacent channel interference on OFDM wireless local area networks (WLAN's). We propose a transmit equalization approach which provides substantial improvement in interference-dominant channels. Simulation results are obtained for an OFDM communication system whose parameters are selected based on IEEE 802.11a standard for WLAN's