DocumentCode :
1347264
Title :
Recovering Cooperative Multiplexing Gain in Wireless Relay Networks
Author :
Yang, Tao ; Yuan, Jinhong ; Zhang, Wei
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia
Volume :
58
Issue :
12
fYear :
2010
fDate :
12/1/2010 12:00:00 AM
Firstpage :
3538
Lastpage :
3549
Abstract :
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.
Keywords :
MIMO communication; antenna arrays; cooperative communication; information theory; multiplexing; telecommunication network routing; wireless channels; M half duplex relays; N antennas; auxiliary frequency bands; cooperative multiplexing gain; d.o.f. bottleneck problem; information theoretic analysis; single antenna; source user; uplink communication; wireless relay networks; Fading; Frequency division multiplexing; Gain; Protocols; Relays; Signal to noise ratio; MIMO; User-cooperation; multiplexing gain; relay channel;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2010.093010.090731
Filename :
5599265
Link To Document :
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