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This paper described the development and implementation of a distributed spectrum monitoring and surveillance testbed for identifying and locating RF signals using the Universal Software Radio Peripheral (USRP). We use a centralized RF trace collection testbed to establish the baseline, and we focus on distributed RF trace collection. Challenges associated with synchronization is identified and candidate...
With more and more distributed and renewable energy sources connected to the utility network, it will introduce different dynamics to the system, and power electronics interfaces are needed to enable efficient and flexible interconnections among different players. Based on Internal Model Principle, sinusoidal denominator can be included in the cascaded controller for DC-AC inverter to achieve the...
In order to ensure synchronized operation of inverters used in renewable energy systems, the output voltage magnitude, frequency and phase angle must be consistent with that of the power grid when it is in islanding operation. Based on author's previous work on single-phase inverter synchronization control with internal model principle, this paper extends the application of that principle to achieving...
In this paper, we introduce a GPS spoofing attack on the time synchronization in wireless networks. As a case study, the frequency hopping code division multiple access (FH-CDMA) based ad hoc network relying on the GPS signal is investigated. The GPS spoofing attack, which is more malicious than other attacks such as jamming, could lead to the loss of network-wide synchronization as well as the loss...
In this paper we study energy detection for primary user signals in the case of distributed Cognitive Radio (CR) networks. We concentrate on the effects of interference caused by other CR users due to timing misalignments and propose a novel mathematical model for calculating the effects of interfering nodes on energy detection and derive closed-form solutions for the probabilities of detection and...
In this paper, a novel synchronization protocol is proposed especially for Cognitive Radio (CR) networks called CR-Sync. In a CR network, time synchronization is indispensable because of the requirements for coordinated and simultaneous quiet periods for spectrum sensing, as well as the common understanding of time frame/slot in many CR MAC designs. The proposed CR-Sync achieves network-wide time...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
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