Performance of OFDM based wireless LAN system under Doppler over Rayleigh fading

Wireless local area network (WLAN) is considered as proper candidate of meeting the needs of next generation broadband wireless communications. OFDM outperforms other system for its capability of mitigates multipath effect under high data rate wireless environment, and it is adopted by 802.11a WLAN standard in its physical layer. This paper focuses on the performance of 802.11a system under two paths Rayleigh fading channel and the Doppler effect on this system. Simulation results show that there is 3 dB coding gain under 2 paths Rayleigh fading channel at BER of 10^-3, also the relative movement of transmitter and receiver with high speed introduces 1 dB degradation around BER of 10^-4.