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Spectrum sensing is one of the most challenging tasks in cognitive radio. Unfortunately traditional schemes fail to balance between accuracy and complexity, which are the key indicators for the performance of spectrum sensing. In this paper, a new spectrum sensing scheme based on phase difference is proposed. Through analyzing the distributions of phase difference between adjacent samples of noise...
High sidelobe power could cause strong interference to primary users in the orthogonal frequency division multiplexing (OFDM) based cognitive radio systems, i. e. non-contiguous (NC) OFDM systems. In this paper, a phase shift method for sidelobe suppression for NC-OFDM systems is proposed and investigated. Instead of multiplying the phase shift sequences with all the active subcarriers, we consider...
Cognitive radio is a promising technology, which can alleviate the problem of crowded bandwidth resource with low spectral efficiency. In this paper, we present a cross-layer approach for joint link scheduling and power control in cognitive radio networks, in order to make more efficient use of system resources. The principle behind this algorithm is to find a transmission scenario in which the network...
Link adaptation is an important issue in the design of cognitive radio networks, which aims at making efficient use of system resources. In this paper, we present a new method to solve the problem of joint rate and power control in cognitive radio networks by using game theory. The optimum rates and powers are obtained by iteratively maximizing each linkpsilas utility function. Simulation results...
In wireless networks, fadings and interferences are two major obstacles for high speed and reliable transmission. In this paper, we consider using joint adaptive modulation and power control to deal with the inherent drawbacks of wireless cognitive radio networks. The transmit side of each link adaptively adjusts its modulation type and power level according to target Bit Error Rate (BER) and Signal-to-Interference-plus-Noise...
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