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Unlicensed spectra access holds the promise of alleviating licensed spectra scarcity and providing super high-rate mobile data services, which has been viewed as one of the key technologies of fifth generation (5G) cellular networks. In this paper, we first design a framework for 5G licensed and unlicensed spectra interoperable networks based on the cloud radio access network technology and the control/data...
Based on risk factor method, a model for building dependence among risk factors is discussed for assessing schedule risk of software project. Three main risk factors which influence software schedule are described. Copula method is used to model the dependence among risk factor, and Monte Carlo method is adopted to simulate the schedule risk model. The empirical results from a Communication Corporation...
Frequency hopping (FH) which can hop according to predefined frequency map becomes more and more important in the communications. However if it uses some frequencies which have been interfered, its performance will become worse. This affects communications quality. A new technique, named Spectrum hole detection technique, which is in cognitive radio, is proposed in this paper. And also an AFH system...
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