Expectation propagation approach to joint channel estimation and decoding for OFDM systems

Authors

Sheng Wu, Tsinghua University
Linling Kuang, Tsinghua University
Nuyao Ni, Tsinghua University
Defeng (David) Huang, The University Of Western AustraliaFollow
Qinghua Guo, University of WollongongFollow

RIS ID

91888

Publication Details

S. Wu, L. Kuang, N. Ni, D. Huang & Q. Guo, "Expectation propagation approach to joint channel estimation and decoding for OFDM systems," in 2014 IEEE International Conference on Acoustic, Speech and Signal Processing (ICASSP 2014), 2014, pp. 1941-1945.

Abstract

We propose a message-passing algorithm of joint channel estimation and decoding for OFDM systems, where expectation propagation is exploited to deal with channel estimation. Specially, the message updating is formulated into a recursive form. As a result, for system with K subcarriers and L channel taps, only O(K + L) messages need to be tracked, and meanwhile they can be efficiently calculated using FFT with complexity O(K|A| + K log2 K), where |A| denotes the constellation size. Numerical experiments show that our algorithm achieves BER performance within 0.5 dB of the knownchannel bound.