An Iterative Channel Estimation Algorithm Based on OMP for OCDM Systems

This letter proposes an iterative channel estimation algorithm based on orthogonal matching pursuit (OMP) for orthogonal chirp division multiplexing (OCDM) systems, where the pilot and data are superimposed on each chirp. Therefore, such a system can achieve higher spectral efficiency (SE) compared to most of the existing algorithms. Meanwhile, a pilot pattern is designed in the frequency domain to ensure the estimation accuracy while reducing the power occupied by pilot. Furthermore, the influence of data symbols on channel estimation is decreased through iterations. Simulation results demonstrate the fast convergence of the proposed iterative algorithm as well as better bit error rate (BER) performance in high-speed communication scenarios compared to related algorithms.