scholarly journals Robust Beamforming and Power Allocation for Secrecy in DF Relay Networks With Imperfect Channel State Information

IEEE Access ◽  
2016 ◽  
Vol 4 ◽  
pp. 9520-9527 ◽  
Author(s):  
Weichen Wang ◽  
Tiejun Lv ◽  
Hui Gao
Keyword(s):  
Power Allocation ◽  
Channel State Information ◽  
Relay Networks ◽  
Robust Beamforming ◽  
Imperfect Channel State Information ◽  
Channel State ◽  
State Information

scholarly journals SVD-Aided Power Allocation and Iterative Detection Scheme for Turbo-BLAST System with Imperfect Channel State Information

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaomin Chen ◽  
Xiangbin Yu ◽  
Dazhuan Xu
Keyword(s):  
Power Allocation ◽  
Channel State Information ◽  
Mimo Channel ◽  
Iterative Detection ◽  
Imperfect Channel State Information ◽  
Channel State ◽  
Detection Scheme ◽  
State Information ◽  
Adaptive Power ◽  
Ber Performance

A new technique that combines adaptive power allocation and iterative detection based on singular value decomposition (SVD) is introduced for the modified Turbo-BLAST system with imperfect channel state information (I-CSI). At the transmitter, in order to maximize the capacity performance, the MIMO channel is decomposed into several parallel eigen subchannels by SVD, and then proper power based on the water-filling principle is allocated to every subchannel subject to the total transmit power constraint. At the receiver, the modified MMSE detector taking the CSI imperfection into account is used to remove the coantenna interference, and then the turbo idea is employed for iterative detection to lower the system BER. As a result, the BER performance is effectively enhanced. Numerical results show that the introduced SVD-aided adaptive power allocation method is valid to improve not only the capacity but also the BER performance in the presence of channel state information imperfection, while the iterative detector can further lower the BER results.

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