Özet:

The performance of communication systems across wireless channels is limited by fading. This is particularly true for vehicular networks, which require highly reliable links. Orthogonal Frequency Division Multiplexing (OFDM) is used today in a wide range of communication systems. It may also be part of the standard for vehicular networks. This paper compares the performance of a vehicular communication system using Quadrature Phase Shift Keying (QPSK) communication over Orthogonal Frequency Division Multiplexing (OFDM) in two channel models found to fit the vehicular channel: Rayleigh and Weibull fading models by comparing the bit error rate under constant signal to noise ratio (SNR). The exact BER has been derived based on the derived of the effective noise sample distribution at the OFDM demodulator output over the Weibull Fading and the log-normal fading channel in AWGN. The Monte Carlo simulation results have verified the validity of the derived analytical BER expressions with an exact match to the simulation results.

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