Bi-harmonic decomposition-based maximum loglikelihood estimator for carrier phase estimation of coherent optical M-QAM
Abstract
A simple feedforward M-QAM carrier phase estimation method is presented and compared to VVMPE-ML and BPS algorithms with 64-QAM and 128-QAM. The laser linewidth tolerance of the proposed improved method outperforms that of VVMPE-ML and BPS.