5.9 GHz Dedicated Short-Range Communication (DSRC) systems are based on the orthogonal frequency division multiplexing (OFDM) systems. OFDM systems are well known for their abilities to combat inter-symbol interference (ISI) in time-invariant, frequency-selective channels. We propose a receiver design to enhance the overall performance of the DSRC system to combat ICI instead of ISI caused by the time-varying channel. Most researchers focus on the time-domain channel model and MAP equalization to combat ISI. It is shown that the proposed receiver design outperforms the conventional DSRC system by up to 15 dB for the same bit error rate (BER) level. This improvement was achieved through a worst-case scenario study, i.e. time-varying Rayleigh faded channel. Furthermore, soft demapping schemes were compared with one another at varying SNRs and velocities. When they were tested at worst-case scenario environments, very little improvements in the DSRC performance were achieved.
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