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In cognitive radios, reliable detection of wireless systems is crucial since these radios share the frequency spectrum with other wireless systems. In a heterogeneous environment, systems with different priorities have different protection requirements and operating parameters.The cognitive radio must guarantee highly reliable communication in the primary systems, but need not necessarily guarantee...
Minority game-based interference management (MGIM) for spectrum sharing is implemented and its experimental results are reported. MGIM is a decentralized transmission scheduling for a lower-priority system to prevent severe interference at a higher-priority system only using one-bit feedback information from the higher-priority system. By using MGIM, it has been demonstrated that the transmitters...
In cognitive radios, reliable detection of wireless systems is crucial since these radios share the frequency spectrum with other wireless systems. At the same time, it is necessary to avoid interference with the primary systems. In a heterogeneous environment, however, systems with different priorities have different protection requirements and operating parameters. The cognitive radio must guarantee...
Recently, the concept of self-organization has drawn considerable attention for its possible use in distributed interference management. To realize self-organized interference management, a minority game (MG) is a promising tool because it facilitates self-organized decision-making. Although the existing interference management scheme that involves the use of an MG achieves transmission control aware...
A distributed channel allocation scheme aware of interference in cognitive radio networks is proposed. The objective of the proposed scheme is to minimize the number of dominant interference signals over a threshold instead of the total interference power. The proposed channel allocation can be treated by using game theory and proved to be a potential game, thus it is guaranteed to converge to a Nash...
The joint effect of power control, access control, and multi-hop transmission on spectral efficiency of a cognitive radio system is evaluated, focusing on the trade-off between the performance of a high priority system and that of a low priority system. So as to avoid interference to the high priority system, the low priority system is assumed to reduce transmit power through power control or stop...
In cognitive radio, reliable detection of the primary system is crucial for the secondary system. However, there is an uncertainty in the received power level due to shadowing. The cooperative sensing where the stations in the secondary system share their sensing information can improve the detection accuracy of the primary system. In this paper, a new secondary system for reducing interference to...
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