DocumentCode :
25568
Title :
Channel Estimation for Two-Way MIMO Relay Systems in Frequency-Selective Fading Environments
Author :
Chiong, Choo W. R. ; Yue Rong ; Yong Xiang
Author_Institution :
Dept. of Electr. & Comput. Eng., Curtin Univ., Bentley, WA, Australia
Volume :
14
Issue :
1
fYear :
2015
fDate :
Jan. 2015
Firstpage :
399
Lastpage :
409
Abstract :
In this paper, we investigate the channel estimation problem for two-way multiple-input multiple-output (MIMO) relay communication systems in frequency-selective fading environments. We apply the method of superimposed channel training to estimate the individual channel state information (CSI) of the first-hop and second-hop links for two-way MIMO relay systems with frequency-selective fading channels. In this algorithm, a relay training sequence is superimposed on the received signals at the relay node to assist the estimation of the second-hop channel matrices. The optimal structure of the source and relay training sequences is derived to minimize the mean-squared error (MSE) of channel estimation. Moreover, the optimal power allocation between the source and relay training sequences is derived to improve the performance of channel estimation. Numerical examples are shown to demonstrate the performance of the proposed superimposed channel training algorithm for two-way MIMO relay systems in frequency-selective fading environments.
Keywords :
MIMO communication; channel estimation; fading channels; least mean squares methods; matrix algebra; relay networks (telecommunication); sequences; CSI; MMSE; MSE minimization; channel estimation; channel state information; first-hop links; frequency-selective fading channel environments; mean-squared error minimization; optimal power allocation; optimal source structure; received signals; relay node; relay training sequence; second-hop channel matrices; second-hop links; superimposed channel training algorithm; two-way MIMO relay systems; two-way multiple-input multiple-output relay communication systems; Algorithm design and analysis; Channel estimation; Fading; MIMO; Relays; Training; Vectors; Channel estimation; MIMO relay; MMSE; frequency-selective fading; power allocation; superimposed training; two-way relay;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2014.2347321
Filename :
6877691
Link To Document :
بازگشت