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In this paper, the performance of cooperative spectrum sensing (CSS) is assessed in the presence of Hoyt fading. A cognitive radio (CR) user, which senses the primary users (PUs) using an energy detector (ED) in sensing channel (S-channel), is censored on the basis of the quality of the reporting channel (R-channel). A threshold-based censoring scheme is used: CR users, whose estimated R-channel fading...
In this paper, the performance of a cooperative spectrum sensing (CSS) is evaluated, considering maximal ratio combining (MRC) fusion in the presence of Rayleigh fading. A cognitive radio (CR) senses the primary users (PUs) using an energy detector (ED) in the sensing channel (S-channel). If a CR is selected to transmit its local decisions to a fusion centre (FC), it does so using a reporting (R)-channel...
In this paper, we consider a binary decision fusion problem for a wireless sensor network, with flat Rayleigh fading, where the sensors make local binary decisions on the status of a common binary phenomenon. A training-based channel estimator is used at the fusion center (FC) to estimate the complex Gausssian fading coefficients characterizing the (direct) links between sensors and FC. This (estimated)...
Sensing range is an important measure of the performance in Wireless Sensor Networks (WSNs). The sensing range which is determined by detection probability depends on the nature of the propagation path, transmit power etc. The detection probability degrades with decreafixed transmit power scheme detection probabilityse in node spatial density and increase in level of shadowing. In fixed transmit power...
This paper considers the problem of fusing decisions in a distributed detection system when the local binary decisions made at the sensors, relative to observations of a common binary phenomenon, are transmitted over Rayleigh faded channel subject to additive noise. We use a training-based channel estimator at the fusion center (FC) to estimate the complex Gaussian fading coefficients characterizing...
Energy Conservation is one of the most vital aspects in Wireless Sensor Networks (WSNs) for better network durability since nodes have limited resources. Excessive high transmit power consumes more energy and increases internode interference significantly. While, low transmit power may cause network failure. Thus choice of optimal transmit power is one of the prime concern in such network. Optimal...
In this paper, we propose signal strength ratio (SSR) based handoff algorithms for cellular networks. Conventional handoff algorithms use averaging method to minimize fluctuations of received signal strength at a mobile station (MS). The algorithm provides good performance under dynamic propagation environment and provides very less delay as averaging of signal strength is not done. Performance of...
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