Distributed spectrum sensing in rem based cognitive radio networks
Ever increasing development of wireless devices and wireless networks have increased the value of spectral space. Many efforts have been conducted to increase spectral utilization. The radio environment mapping opens new gates for developing low cost wireless devices. In this paper, a new method is proposed for increasing spectral utilization in distributed networks. In this method distributed Kalman filter, which is modified to increase estimation accuracy, is used to estimate position, velocity and power of primary transmitters. These data are used to select spectrum holes optimally and increase spectral utilization compared to centralized methods. Obtained results are evaluated through practical implementations and simulations. Innovations of this research include introducing and employing a linear model for estimating position of a transmitter using received power in line of sight (LoS) and non-line of sight (NLS) conditions, modifying extended kalman filter and implementation of distributed spectrum sensing; advantages of this method are illustrated compared to centralized methods.
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