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In this study, the authors consider the standard condition number (SCN) detector for a cognitive radio with finite number of cooperative sensors. They derive an exact nested form of the distribution of the SCN for the central uncorrelated, non-central uncorrelated and central semi-correlated Wishart matrices under <alternatives>${\cal H}_0$<mml:math overflow="scroll"><mml:msub><mml:mrow><mml:mi mathvariant="script">H</mml:mi></mml:mrow><mml:mn>0</mml:mn></mml:msub></mml:math><inline-graphic xlink:href="IET-SPR.2016.0146.IM1.gif" /></alternatives>...
In order to improve the sensing accuracy of free spectrum in cognitive radio system, different sensing strategies were proposed according to the regions where cognitive users located: cognitive users located at the edge of the primary user's decoding region sense spectrum through part collaboration with its adjacent non-edge cognitive user; Cognitive users located at the non-edge region use multi-node...
In this paper we evaluate the sensing performance by using a MRC based blind channel combining scheme in low SNR environment, to sense the low level primary signal in cognitive radio with multiple antenna. MRC based blind channel combining for multiple antennas is known as achieving almost the same performance compared with an optimum MRC which has full knowledge of the channels if we apply it in...
Nowadays, cognitive radio technology is an intelligent spectrum sharing technology. In order to ensure the licensed users will not be interfered, cognitive(unlicensed) users must be able to detect the spectrum vacancy fast and reliably. For several existing multi-node detection schemes didn't take the test results' reliability of the cognitive users in different locations into consideration, this...
Cognitive radio (CR) is a promising technology for the efficient use of available spectrum. Reliable detection of primary user (PR) signals and spectrum sensing are the most important challenges which meet the implementation of the CR. In CR's communications, the PR user must be protected from the interference from the CR users. This can be achieved only by using an optimal spectrum sensing. In this...
The present wireless communication system under coal mines is characterized by single pattern, fixed communication frequency, incapability of adaptive to various tunnel environments. To solve the above problems, cognitive radio (CR) is applied to the system. With the energy detection algorithms used in the spectrum sensing of various tunnels under mines, the spectrum sensing method adaptive to tunnel...
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