Title :
Robust Joint Beamforming for MIMO Relay Broadcast Systems with Limited Feedback
Author :
Zhao, Wei ; Shi, Junfeng
Author_Institution :
SICE, Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Considering the user with multiple antennas in MIMO relay limited feedback systems. Duo to quantization errors of channel direction information (CDI), the rates and capacity of system are decreased. Aiming at this problem, we analyzed the statistics of quantization error of CDI and proposed two robust linear beamforming schemes which based on block diagonalization (BD) criterion and minimum mean square error (MMSE) criterion respectively. The simulation results and analyses show that the proposed schemes decreases the average bit error rate (BER) compared with conventional schemes.
Keywords :
MIMO communication; antenna arrays; array signal processing; error statistics; feedback; least mean squares methods; quantisation (signal); relays; BD criterion; BER; CDI; MIMO relay broadcast system; MIMO relay limited feedback system; MMSE criterion; bit error rate; block diagonalization criterion; channel direction information; minimum mean square error criterion; multiple antenna; quantization error; robust joint linear beamforming scheme; Array signal processing; Bit error rate; Joints; MIMO; Quantization; Relays; Robustness;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6250-6
DOI :
10.1109/wicom.2011.6040198
