Improved performance at higher data rates of DSRC systems using a linear demapper

This paper proposes and designs a linear demapper which compares to a recently proposed non-linear demapper under different decoding schemes of dedicated short-range communications (DSRC) receivers. Modelling and simulations are carried out under common mobile vehicular channel conditions. It can easily be seen that multipath and Doppler shift has a detrimental effect on the transmitted modulated messages. The effect of hard and soft demapper choice on BER performance of the DSRC Physical Layer (PHY) is shown for comparison. Digital and analog circuit elements are modeled and imperfections are taken into account in the simulations. Compared to the conventional system, our proposed system improves lower code rate demapping accuracy and substantially improves high code rate transmissions. Simulation results confirm that our proposed scheme can offer performance advantage of around a couple of orders of magnitude over both the conventional and non-linear demapper designs at higher data rates.