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http://dx.doi.org/10.5515/KJKIEES.2012.23.8.976

Performance of Cognitive Radio Systems Based on Multiple Orthogonal Sequences  

Lee, Kyung-Sun (Department of Wireless Communications Engineering, Kwangwoon University)
Kim, Yoon-Hyun (Department of Wireless Communications Engineering, Kwangwoon University)
Kim, Jin-Young (Department of Wireless Communications Engineering, Kwangwoon University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.23, no.8, 2012 , pp. 976-984 More about this Journal
Abstract
Ad hoc networks can be used under difficult conditions, where it is difficult to construct infrastructures, such as shadowing areas, disaster areas, war area, and so on. In order to support to considerable and various wireless services, more spectrum resources are needed. However, efficient utilization of the frequency resource is difficult because of spectrum scarcity and the conventional frequency regulation. Ad-hoc networks employing cognitive radio(CR) system that guarantee high spectrum utilization provide effective way to increase the network capacity. However, there is a problem that all CR user do not fairly use the primary user's idle bandwidth which has been sensed. In this paper, to solve this problem, we propose the spectrum sharing algorithm which uses the multiple orthogonal sequences based on the code division multiple access(CDMA). From the proposed algorithm, it is expected that system performance of CR based ad-hoc network is improved significantly and it can be applied to the implementation of CR based ad-hoc network system.
Keywords
Cognitive Radio(CR); Orthogonal Sequence; CDMA; Spread Spectrum; Ad-hoc Network;
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