Blind channel estimation assisted coherent demodulation of DPSK modulated OFDM systems

In this paper, we consider differential PSK modulated OFDM systems, e.g., DAB family of standards, and propose an advanced demodulation scheme to improve the reception quality with respect to conventional differential demodulation. Proposed demodulation scheme is based on a simple blind channel estimation and coherent demodulation, and it improves reception quality by generating more reliable soft-bit information for the forward error correction decoder. Motivated by better robustness against time-varying channels, we also propose a blind channel tracking algorithm. In the numerical results, we provide performance results of the proposed methods at different mobility levels. In all mobility scenarios, proposed blind channel estimation and tracking assisted coherent demodulation methods provide significant improvement in reception quality.