Title :
A Joint Precoding and Subchannel Selection Scheme for Cooperative MIMO Relay Systems
Author :
Wang, Ji ; Song, Lei ; Wang, Hualei ; Sun, Qi ; Jin, Jin
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
In cooperative MIMO relay systems, when amplify-and-forward (AF) mode is used, the equivalent channel from source station (SS) to destination station (DS) can be seen as a simple MIMO channel. When singular value decomposition (SVD) based precoding is used in the system, the equivalent channel can be decomposed into several parallel non-interfering subchannels. It is showed that some of the singular values of the subchannels can be very small and the performance of the whole system is limited by the subchannels with the lower gains. Thus it is important to decide how many subchannels should be used to maximize the system performance. In this paper, we propose that half of the subchannels with higher singular values should be used, with the joint consideration of data rate and bit error rate (BER). The simulation shows that when the data rate is fixed, the proposed methods can achieve the optimal BER performance.
Keywords :
MIMO communication; amplify and forward communication; channel coding; cooperative communication; error statistics; satellite communication; singular value decomposition; MIMO channel; amplify-and-forward mode; bit error rate; cooperative MIMO relay system; data rate; destination station; equivalent channel; joint precoding; optimal BER performance; parallel noninterfering subchannel; singular value; singular value decomposition; source station; subchannel selection scheme; Antennas; Bit error rate; Correlation; MIMO; Quadrature amplitude modulation; Relays;
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.2011.6040199