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In light of starting clutch control requirement in unmanned modified process of a helicopter, the control system with high-reliability circuit, excellent engagement quality and engine speed stability are researched. By analysing the disadvantantages of the original clutch control system, the improved design requirements are proposed. To achieve the requirements, half bridge chips are used in the control...
In this paper, the power allocation problem for Orthogonal frequency division multiplexing(OFDM)-based relay cognitive radio systems is investigated. An optimization power allocation algorithm is developed. In the algorithm, objective function is studied and simplified. The channel capacity of secondary users is maximized while keeping the total interference introduced to primary user less than a...
In this paper, a suboptimal subcarrier and power allocation algorithm has been developed for the orthogonal frequency division multiplexing(OFDM)-based relay cognitive radio systems. The channel capacity of secondary users is maximized while keeping the total interference introduced to primary user less than a given threshold with a specified power. Compared with the other power allocation algorithm,...
End-to-end delay is an important metric for network performance. This paper studis the end-to-end delay in a two-hop Cognitive Machine-to-Machine (CM2M) network, where a pair of primary users (PUs) coexist with a secondary (SR) network with many two-hop line M2M communication links. The occupancy of the licensed channel by PUs is modelled as a continuous-time two-state (busy and idle) Markov process...
Cognitive Radio networks which consist of primary and secondary networks are widely considered efficient systems to solve the serious problem of spectrum scarcity. The data transmission of secondary network is subject to the spectrum opportunity provided by primary network. In this paper, we investigate expected density of progress of secondary network with three routing strategies which are farthest...
In this paper, we propose a spacial time slot scheduling algorithm for relay operation to improve the throughput performance of millimeter-wave wireless personal area network (mmWave WPAN) systems which employ directional antenna. The upcoming mmWave WPAN is designed for high definition TV (HDTV) transmission, high speed wireless docking and gaming, etc. Based on the fact that the significant path...
In this paper, we propose a cross-layer deflect routing scheme that improves effective throughput of multi-hop millimeter-wave wireless personal area network (mmWave WPAN) system. The upcoming mmWave WPAN is designed to provide Gbps-order transmission capability, targeting applications like high definition TV (HDTV) transmission, high speed wireless docking and gaming etc. Adopting multi-hop relay...
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