The common problem of OFDM systems is high sensitivity to frequency offset caused by tuning oscillator instabilities and Doppler shifts induced by the channel. Time variances of the channel during one OFDM symbol interval destroy the orthogonality of different subcarriers and generate power leakage among subcarriers, known as Inter-Carrier Interference (ICI). ICI in OFDM systems degrades the performance of both symbol detection and channel estimation. ICI produce phase noises which increase error vector magnitude (EVM) for conventional digital modulation methods such as phase-shift keying (PSK) and quadrature-amplitude modulation (QAM). The main focuses of this research are theoretically and practically evaluate the wireless local area network (WLAN) with Institute of Electrical and Electronics Engineers (IEEE) 802.11g standard in mobile environment such as vehicular to infrastructure (V2I) from Doppler Effect aspect.