Recovering cooperative multiplexing gain in wireless relay networks

Publication Type:
Journal Article
Citation:
IEEE Transactions on Communications, 2010, 58 (12), pp. 3538 - 3549
Issue Date:
2010-12-01
Full metadata record
Files in This Item:
Filename Description Size
Thumbnail10 YangTcom10_CMG.pdfPublished Version923.71 kB
Adobe PDF
We consider an uplink communication in a wireless network where each source-user is assisted by M half-duplex relays. The source users and relays are equipped with single-antenna whereas the destination has N antennas. We show that the degree of freedom (d.o.f.) of this network is limited by the links from the source to the collection of relays and destination. This phenomenon is referred to as a "d.o.f. bottleneck problem" which compromise the cooperative multiplexing gain (CMG) and the achievable rate of the system. To improve the CMG, we propose an auxiliary frequency bands (AFBs)-based approach to tackle the d.o.f. bottleneck problem. Information theoretic analysis and numerical results show that the proposed scheme can achieve a CMG of min(M+1,N) when the number of AFBs is sufficiently large. As compared with conventional cooperative communications, the improved multiplexing gain of the proposed scheme is translated into tremendously increased achievable rate at a relatively high SNR. © 2010 IEEE.
Please use this identifier to cite or link to this item: