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Power distribution network is the bridge between power transmission and power consumers, which is an important part of directly feeling the service quality of the power supply by consumers. Intelligent power distribution network of smart grid is an important means to improve power supply reliability and quality of power supply, and real-time monitoring of the distribution network is an important foundation...
There is a common belief that much of the licensed bands lies idle at any given time and location in wireless communications. In the case of high spectrum utilization, it is very vital to find out those spare bands for providing a better chance of opportunistic access in spectrum scarcity environment. In this paper, a novel algorithm based on gradient operators is proposed, which will be used to preprocess...
Spectrum sensing is a key feasible technology for cognitive radio (CR). Sensing time is an important sensing parameter which brings about a sensing-throughput tradeoff. In this paper, based on soft decision schemes, we investigate the sensing-throughput tradeoff problem and analyze the impact of different system parameters on the optimal sensing time for cooperative spectrum sensing. Simulation results...
The satellite orbit parameters in the ephemeris and location of land emitter are studied. Universal mathematic models of TDOA and FDOA are deduced using geometric vector. The priori information of TDOA and FDOA between two satellites are analyzed which are selected from Globalstar and Inmarsat satellite communications systems. The simulation results show the effectiveness and universality of the models,...
Studying the HVDC typical fault-the commutation failure and its protection measures will give some guidance for HVDC engineering, also, it will improve the AC-DC power system safety and reliability with great significance. Based on the analysis of commutation failure of HVDC, the article studies the effect of the commutation failure when the commutation buses have different kinds of AC faults on the...
In this paper, we propose a location-aware relay selection (LARS) scheme based on geographical information in the distributed opportunistic relay (OR) communication system. The scheme aims to limit the contention among potential relays through dividing the whole relay selection region into some small nonoverlapping contending torus zones. If a relay lies in the specified contending zone and its local...
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