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This paper proposes an impact increments-based state enumeration (IISE) reliability assessment approach, specially designed for transmission systems. Firstly, the reliability index calculation formula of the traditional state enumeration technique is transformed into an impact increments-based formation. With the derived formula, the calculation of state probability is simplified and the weight of...
To acquire weak signals GPS reiceiver requires longer observation intervals to accumulate sufficient energy from the signal of intermediate frequency. Full bit method avoids effects of the data bit modulation thereby preserves a longer coherent integration yet consumes too much time and resources. In this paper, an enhanced full bit method is proposed, which aims at speeding up the full bit acquisition...
Rescue forces decide the results of a rescue. We try to quantitatively study the rescue forces' influence on the result of the earthquake relief[1][2]. We build a model of post-earthquake emergency rescue system on the CAS theory and build a simulation model based on Swarm platform. And analyze the outputs of the simulation. Through the analysis, we find that in the rescue process, the number of rescuer...
Radio spectrum has become a precious resource, and it has long been the dream of wireless communication engineers to maximize the utilization of the radio spectrum. Dynamic Spectrum Access (DSA) and Cognitive Radio (CR) have been considered promising to enhance the efficiency and utilization of the spectrum. In current overlay cognitive radio, spectrum sensing is first performed to detect the spectrum...
Due to providing ideal detection performance, cooperative spectrum sensing has been widely employed in cognitive radio networks. However, sensing results of the distributed second users have great uncertainty arising from channel conditions. In order to settle the problem, this paper proposes a selective cooperative spectrum sensing scheme based on improved Dempster-Shafer evidence theory. The scheme...
Sums of lognormal random variables occur in many important problems in wireless communications. However, the lognormal sum distribution is known to have no close-form and is difficult to compute numerically. Several approximation methods have already been proposed to approximate the lognormal sum distribution. However, these approximation methods all have their drawbacks: some widely used approximation...
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