EXPECTATION PROPAGATION APPROACH TO JOINT CHANNEL ESTIMATION AND DECODING FOR OFDM SYSTEMS

被引：0

作者：

Wu, Sheng ^{[1
,4
]}

Kuang, Linling ^{[2
]}

Ni, Zuyao ^{[3
]}

Lu, Jianhua ^{[1
]}

Huang, Defeng ^{[5
]}

Guo, Qinghua ^{[5
,6
]}

机构：

[1] Tsinghua Univ, Dept Elect Engn, Beijing, Peoples R China

[2] Tsinghua Univ, Tsinghua Space Ctr, Beijing, Peoples R China

[3] Tsinghua Univ, Res Inst Informat Technol, Beijing, Peoples R China

[4] Univ Western Australia, Wireless Broadband Commun & Signal Proc, Shenzhen Key Lab, Nedlands, WA 6009, Australia

[5] Univ Western Australia, Sch Elect Elect & Comp Engn, Nedlands, WA 6009, Australia

[6] Univ Wollongong, Sch Elect Comp & Telecommun Engn, Wollongong, NSW 2522, Australia

来源：

2014 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP) | 2014年

基金：

澳大利亚研究理事会;

关键词：

Expectation propagation; joint channel estimation and decoding; message passing; OFDM; FACTOR GRAPHS; RECEIVER;

D O I：

暂无

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

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 vertical bar A vertical bar + K log 2 K), where vertical bar A vertical bar denotes the constellation size. Numerical experiments show that our algorithm achieves BER performance within 0.5 dB of the knownchannel bound.

引用

页数：5

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