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This letter introduces a new and energy-efficient gate drive circuit for emitter turn-off thyristor (ETO). The proposed circuit is a buck converter with two controllers that obtains power from gate current when the ETO gate voltage is negative, thus reducing power dissipation of the ETO gate drive and significantly mitigating a limitation of current ETO self-power designs. Various on-state gate current...
In this paper, we consider the medium access control (MAC) protocol design for cognitive radio networks. An opportunistic spectrum access protocol named Slotted CR-ALOHA is proposed, and its performances in terms of normalized throughput and average packet delay are evaluated. Simulation results show that for various frame lengths and number of SUs, the optimal performance can be achieved at an appropriate...
In this paper, we consider the cooperative spectrum sensing problem for a cognitive radio (CR) mesh network. Based on multiple relay model, we propose two cooperative spectrum sensing strategies called amplify-and-relay (AR) and detect-and-relay (DR), and also derive the closed-form expressions of false alarm and detection probabilities. Simulation results show that our proposed strategies achieve...
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