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http://dx.doi.org/10.1109/JCN.2014.000021

A Method to Avoid Mutual Interference in a Cooperative Spectrum Sharing System  

Tran, Truc Thanh (Department of Information and Communications of Danang City)
Kong, Hyung Yun (Department of Electrical Engineering, University of Ulsan)
Publication Information
Journal of Communications and Networks / v.16, no.2, 2014 , pp. 110-120 More about this Journal
Abstract
This article proposes a spectrum sharing method which can avoid the mutual interference in both primary and secondary systems. The two systems make them a priority to use two single-dimension orthogonal signals, the real and imaginary pulse amplitude modulation signals, if the primary system is not in outage with this use. A secondary transmitter is selected to be the primary relay and the active secondary source to perform this. This allows a simultaneous spectrum access without any mutual interference. Otherwise, the primary system attempts to use a full two-dimensional signal, the quadrature amplitude modulation signal. If there is no outage with respect to this use, the secondary spectrum access is not allowed. When both of the previous attempts fail, the secondary system is allowed to freely use the spectrum two whole time slots. The analysis and simulation are provided to analyze the outage performance and they validate the considerable improvement of the proposed method as compared to the conventional one.
Keywords
Cognitive radio; cooperative spectrum sharing (CSS); decode and forward; underlay spectrum sharing;
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