Data Detection for OFDM Systems with Phase Noise and Channel Estimation Errors Using Variational Inference

Feng LI  Shuyuan LI  Hailin LI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A   No.4   pp.1037-1044
Publication Date: 2017/04/01
Online ISSN: 1745-1337
Type of Manuscript: PAPER
Category: Communication Theory and Signals
Keyword: 
channel estimation error,  orthogonal frequency division multiplexing (OFDM),  phase noise (PHN),  variational inference,  

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Summary: 
This paper studies a novel iterative detection algorithm for data detection in orthogonal frequency division multiplexing systems in the presence of phase noise (PHN) and channel estimation errors. By simplifying the maximum a posteriori algorithm based on the theory of variational inference, an optimization problem over variational free energy is formulated. After that, the estimation of data, PHN and channel state information is obtained jointly and iteratively. The simulations indicate the validity of this algorithm and show a better performance compared with the traditional schemes.