In this work, with combined belief propagation (BP), mean field (MF) and expectation propagation (EP), an iterative receiver is designed for joint phase noise (PN) estimation, equalization and decoding in a coded communication system. The presence of the PN results in a nonlinear observation model. Conventionally, the nonlinear model is directly linearized by using the first-order Taylor approximation, e.g., in the state-of-the-art soft-input extended Kalman smoothing approach (soft-in EKS). In this work, MF is used to handle the factor due to the nonlinear model, and a second-order Taylor approximation is used to achieve Gaussian approximation to the MF messages, which is crucial to the low-complexity implementation of the receiver with BP and EP. It turns out that our approximation is more effective than the direct linearization in the soft-in EKS with similar complexity, leading to significant performance improvement as demonstrated by simulation results.
@article{arxiv.1603.04163,
title = {A BP-MF-EP Based Iterative Receiver for Joint Phase Noise Estimation, Equalization and Decoding},
author = {Wei Wang and Zhongyong Wang and Chuanzong Zhang and Qinghua Guo and Peng Sun and Xingye Wang},
journal= {arXiv preprint arXiv:1603.04163},
year = {2016}
}
Comments
5 pages, 3 figures, Resubmitted to IEEE Signal Processing Letters