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To help unlicensed users to use the maximum available licensed bandwidth, an opportunistic communication technology called cognitive radio, (CR) is developed. It has recently attracted a great deal of research interest. Even though the majority of future wireless devices will be mobile, mobility is yet unexplored in the context of CR. There is no proper framework for mobile CRs to effectively use...
Wireless sensor-actor networks (WSAN) consist of a vast number of sensors and few actors. Generally, these networks are deployed in an unprotected environment to sense the physical world, and perform reliable actions on it. Hence, these networks are always susceptible to various kinds of passive and active attacks by malicious nodes. The back hole and gray hole attacks are part of active attacks....
Energy efficiency and adaptability in the utilization of radio spectrum are two major research challenges for the advancement of future wireless communications technologies. To address these difficulties, we enhance the energy efficiency by utilizing spectrum opportunity forecasting (SOF) and optimal scheduling for sensor node activation to decrease the required number of SS events. The application...
This paper proposes a Cognitive Radio system where primary users cooperate with the secondary users by performing the task of data transmission and channel monitoring simultaneously, using the proposed receiver and frame structures. The proposed system works beyond the sensing-throughput tradeoff, overcomes the hidden terminal problem of the secondary users and increases awareness of the primary users...
Heart disease is one among the most factors inflicting death in developed and developing countries. Heart rate monitoring plays an important role in detecting abnormalities in heart rhythm. This paper proposes cardiac arrhythmia detection method based on the heart rate using ballistocardiogram (BCG) signal. The BCG signals are acquired for 10 minutes from 20 subjects using piezoelectric sensors and...
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