We propose to apply DSRC using OFDM to roadside-vehicle communication systems asa means to overcome frequency selective fading, shadowing and high-speed hand-overdifficulties. We optimized the symbol rate per subcarrier of DQPSK which is atransmission parameter of the OFDM system. Our goal is to achieve BER of less than10-5 under the conditions of transmission rate 2.048 Mbps, carrier frequency 5.8GHz,vehicle speed 180km/h, simulcasting of several roadside transmitters, maximum delay ofless than 1μsec and utilize forward error correction (FEC). We developed thetransmitter and receiver of the DQPSK-OFDM system in the 5.8GHz band andmeasured the BER performance to show that OFDM system was applicable to roadsidevehiclecommunication systems.
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