DocumentCode :
1926728
Title :
Two-way discriminatory channel estimation for non-reciprocal wireless MIMO channels
Author :
Huang, Chao-Wei ; Chang, Tsung-Hui ; Zhou, Xiangyun ; Hong, Y. -W Peter
Author_Institution :
Inst. of Commun. Eng. & Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
fYear :
2011
fDate :
6-9 Nov. 2011
Firstpage :
202
Lastpage :
206
Abstract :
The idea of discriminatory channel estimation (DCE) was recently proposed to differentiate the performance at a legitimate receiver (LR) and an unauthorized receiver (UR) by carefully designing the training phase of transmission. In particular, an artificial noise (AN) signal is inserted into the training signal to degrade the channel estimation performance at UR. However, without careful design, the inserted AN may potentially leak into LR´s channel causing degradation in LR´s performance. In order to minimize such an undesirable AN leakage, the transmitter must acquire sufficient knowledge of the downlink channel to LR for careful signalling, which is particularly difficult to achieve in non-reciprocal channel environments. In this work, we design a DCE scheme with multiple training stages to achieve this task. The key feature of the proposed scheme is to utilize a two-way training scheme that allows both the transmitter and LR to collaboratively send different training signals to achieve DCE. Simulation results demonstrate that our proposed scheme is able to achieve accurate channel estimation and data detection performances at LR, while severely degrading UR´s performances.
Keywords :
MIMO communication; channel estimation; signal detection; wireless channels; AN signal; DCE scheme; LR channel; UR performance; artificial noise signal; data detection performances; downlink channel; legitimate receiver; nonreciprocal channel environment; nonreciprocal wireless MIMO channels; training signal; transmission training phase; two-way discriminatory channel estimation; two-way training scheme; unauthorized receiver; Channel estimation; Covariance matrix; Downlink; Receivers; Training; Transmitters; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers (ASILOMAR), 2011 Conference Record of the Forty Fifth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
ISSN :
1058-6393
Print_ISBN :
978-1-4673-0321-7
Type :
conf
DOI :
10.1109/ACSSC.2011.6189985
Filename :
6189985
Link To Document :
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