Comparing Performance of OFDM based V2V System in Rayleigh and Weibull Fading Channels

Abstract

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