Analysis and Suppression of Effects of CFO and Phase noise in WFMT Modulation for Vehicular Communications

We investigate the WFMT (wavelet filtered multitone) modulation scheme for vehicular system and describe the effect of the carrier frequency offset and phase noise on the performance of this scheme. WFMT modulation scheme is based on the wavelet theory and complex filter banks for synthesis and analysis of multi-channel signal. WFMT modulation scheme keeps on the advantage of filter banks system and decreases the system complexity and can be easily possible for the implementation of filter banks. In this paper, we compare ISI (inter symbol interference) and ICI distortions of the WFMT and vehicular OFDM system due to the CFO (carrier frequency offset) and phase noise. And we analyze the PAPR performance of these systems and show the BER performance curve in the HPA and ICI situation owing to the Doppler frequency shift and the frequency offset. Also, the performance of WFMT system versus vehicular OFDM is calculated to find the SNR degradation on DMT (discrete multitone)/OFDM and WFMT system with number of FFT points in the presence of ICI, ISI, phase noise, PAPR and Doppler Effect. In the simulation results, the PAPR performance of WFMT system becomes worse because of characteristic of wavelet component coefficients.