NDLI: Semi-Blind Multipath Channel Estimation and Precoding Design in AF Two-Way Relay Networks

Content Provider	IEEE Xplore Digital Library
Author	Ming-Li Wang Chih-Peng Li Wan-Jen Huang Yen-Cheng Chen Li-Chung Lo
Copyright Year	2013
Description	Author affiliation: Nat. Sun Yat-sen Univ., Kaohsiung, Taiwan (Ming-Li Wang; Chih-Peng Li; Wan-Jen Huang; Yen-Cheng Chen; Li-Chung Lo)
Abstract	We propose a semi-blind channel estimation for two-way relay networks (TWRNs) where multiple relays employ amplify-and-forward (AF) protocol and the channel is frequency-selectively faded. The challenges of the channel estimation are resulted from inter-symbol interference (ISI), self-interference in two-way systems and difficulty to estimate each relay link separately. To deal with ISI and to obtain the effective channel impulse response (CIR) of each relay link individually, cyclic prefix is inserted in source messages and we propose a low-complexity and scalable design of precoding matrices at relays. Under the framework, effective CIR of each relay link is estimated through the second-order statistics of the received signals, while ambiguity resulted from the channel matrices of direct links between users are resolved by a small number of training blocks. It shows through simulations that NMSE of the proposed scheme exists error floor at high SNR, which can be mitigated by averaging over more blocks of received signals especially when the channel varies slowly.
Starting Page	1
Ending Page	5
File Size	255441
Page Count	5
File Format	PDF
ISBN	9781467361873
ISSN	10903038
DOI	10.1109/VTCFall.2013.6692405
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Channel estimation Training Estimation Signal to noise ratio Vectors Fading
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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