Hybrid Carrier Modulation System with Partial FFT Demodulation Over Doubly Selective Channels in Presence of Carrier Frequency Offset

摘要

The effectiveness of communication system is impaired by the carrier frequency offset (CFO) and inter-carrier interference (ICI) due to the significant time variation under doubly selective (DS) channels. In this paper, we consider the weighted-type fractional Fourier transform (WFRFT)-based hybrid carrier modulation (HCM) system with partial fast Fourier transform (PFFT) demodulation for DS channels in presence of CFO. The influence of CFO and ICI, after PFFT demodulation and optimal channel compensation, can be further suppressed under certain WFRFT domain. Numerical results are presented to demonstrate the superiority of HCM with PFFT demodulation over the single carrier modulation and orthogonal frequency division multiplexing systems with PFFT demodulation at a very moderate complexity.