DocumentCode :
2737588
Title :
CORE-4: Cognition oriented relaying exploiting 4-D spectrum holes
Author :
Wang, Xijun ; Liu, Juan ; Chen, Wei ; Cao, Zhigang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
fYear :
2011
fDate :
4-8 July 2011
Firstpage :
1982
Lastpage :
1987
Abstract :
In cognitive relay systems, spectrum holes exist in 4 dimensions (4-D), namely, time, frequency, location, and direction. How to efficiently utilize these different kinds of spectrum holes to provide quality-of-service (QoS) guarantees for secondary users (SU) is a challenging task. In this paper, we first identify the benefits of separately applying cooperative beamforming and rateless coding aided relaying technologies. Specifically, cooperative beamforming has the particular advantage of exploiting spatial or directional spectrum holes without causing interference to PUs. On the other hand, rateless coding is capable of utilizing different kinds of spectrum opportunities in an aggregate way with low complexity. Both cooperative beamforming and rateless coding aided cognitive relaying schemes have been proposed to support either elastic or real-time traffics for SUs. Furthermore, we combine cooperative beamforming and rateless coding together in order to provide an efficient and robust way to utilize 4-D spectrum holes in cognitive relay systems, where spectrum sensing and channel estimation may be imperfect. A substantial performance gain can be obtained by the combination, compared to using these two techniques separately.
Keywords :
array signal processing; channel estimation; cognitive radio; cooperative communication; encoding; interference suppression; quality of service; radiofrequency interference; relays; telecommunication traffic; CORE-4; channel estimation; cognition oriented relaying exploiting 4D spectrum hole; cognitive relay system; cooperative beamforming; directional spectrum hole; interference; quality-of-service; rateless coding; spatial spectrum hole; spectrum sensing; traffic; Array signal processing; Decoding; Delay; Encoding; Fading; Relays; Throughput; Cognitive relaying; cooperative beamforming; cross-layer design; rateless coding; spectrum holes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Communications and Mobile Computing Conference (IWCMC), 2011 7th International
Conference_Location :
Istanbul
Print_ISBN :
978-1-4244-9539-9
Type :
conf
DOI :
10.1109/IWCMC.2011.5982838
Filename :
5982838
Link To Document :
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