Title :
A joint precoding and beamforming algorithm for multi-relay multiuser MIMO-OFDM systems
Author :
Dongyue Zhou ; Binjie Hu
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
Based on amplify-and-forward cooperative relay multi-relay multi-user system, in order to reduce the bit error rate of OFDM-based wireless systems, a practical limited bits feedback precoding algorithm is proposed. Using matrix singular value decomposition, designs optimized precoding matrices beamforming vectors. Source precoding and relay beamforming matrices are jointly optimized. The precoding and beamforming matrices index can be fed back using offline codebooks. Achievable sum-rate formula is derived. Simulations indicate the effectiveness of the proposed joint precoding and beamforming design. The proposed method can improve bit-error-rate performance and can obtain good sum-rate performance contrast to existing algorithm. It is a practical scheme of multi-user networks for linear algorithm.
Keywords :
MIMO communication; OFDM modulation; amplify and forward communication; array signal processing; cooperative communication; error statistics; precoding; relay networks (telecommunication); singular value decomposition; OFDM-based wireless systems; achievable sum-rate formula; amplify-and-forward cooperative relay multirelay multiuser system; beamforming matrix index; bit error rate performance improvement; bit error rate reduction; joint precoding-beamforming algorithm; linear algorithm; matrix singular value decomposition; multirelay multiuser MIMO-OFDM systems; multiuser networks; offline codebooks; practical limited bit feedback precoding algorithm; precoding matrix beamforming vector optimization; precoding matrix index; relay beamforming matrix; source precoding matrix; sum rate performance contrast; Array signal processing; Bit error rate; Joints; MIMO; OFDM; Relays; Wireless communication; Precoding; beamforming; multi-relay; multi-user; relay communication;
Conference_Titel :
Signal and Information Processing (ChinaSIP), 2014 IEEE China Summit & International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4799-5401-8
DOI :
10.1109/ChinaSIP.2014.6889308