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A novel cooperative spectrum sensing mechanism that combines the energy detection with the majority decision fusion was proposed for the poor probability of single-user energy detection under low SNR in spectrum sensing algorithms. The proposed algorithm employs a double threshold method in the signal detection, while sending the test results to the fusion center, and then uses the majority decision...
In a cognitive radio network based on underlay, the secondary users need to ensure that the interference to the primary users does not exceed the maximum interference tolerance. In this paper, a new algorithm of power allocation is proposed by solving optimal problem according to the theory of duality. The algorithm proposed can satisfy both the limitation of interference tolerance and the requirement...
Spectrum sensing is the key and premise of cognitive radio. The current spectrum sensing methods have some failures and limitations, such as sensitivity to noise uncertainty and failure in some special modulation types. In order to cope with these problems and improve the detection performance, we propose a blind spectrum sensing method based on Petrosian's algorithm in frequency domain. It calculates...
The cognitive radio is based on the thought of adaptive channel allocation. It solves the problems of spectrum lack and spectrum inefficiency in current communication networks. In this paper we propose an improved algorithm to the channel allocation in the cognitive radio based on potential game theory aimed at minimizing the system interference. The improved algorithm will accelerate the game to...
Cognitive radio technology is a promising technology to solve the inefficiency problem of the usage of spectrum, and with the help of the cooperative communication technology, the system can obtain more performance. This paper proposes a cooperative communication strategy based on physical-layer network coding (PNC) to work out the difficulty that the primary cannot communicate, which the secondary...
Spectrum detection is a key issue of cognitive radio system. The strength of the spectrum testing ability directly determine the cognitive radio system can whether or not effectively work. Based on it, this topic is about spectrum's detection technology research. This paper introduce matrix theory that have been widely applied in wireless communication to multi-users environment and combine covariance...
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