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
收藏
页数：5
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