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Cognitive radio emerges as a promising technology to improve the utilization of the allocated spectrum. In a cognitive radio network, secondary users (SUs) need to sense the spectrum to obtain currently available channels and have to vacate the occupied channels when primary users (PUs) return. In cognitive radio networks, establishing a link through a common available channel is defined as the rendezvous...
Ad-hoc networks are promising complements for the infrastructure based network under disastrous scenarios. However, due to the heterogeneous surrounding environment of each user, the channel availability of each user may be quite different. Cognitive radio emerges as a promising technology to enable two users to communicate under different channel availability, by opportunistically accessing available...
The study of the paper concerns with the timing and synchronization problems in the impulse radio-ultra wideband (IR-UWB) positioning system. A novel synchronization algorithm based on two-stage enveloping method to improve the conventional sliding correlation performance is proposed. The correlator output is processed by two-stage enveloping firstly, then the fine synchronization interval is determined...
The Microwave Circuit is an important course for the college students on specialty of radio and communication. But both teaching and learning of this course have great difficulty as a result of so much abstract concept, especially for undergraduate students. Some steps for reform using computer-aided design (CAD) tools with relative syllabus are proposed later. And some strategies are found to be...
In a single-cylinder gasoline engine for the study, made a simulation optimization method of engine valve timing. After the construction of a simulation model of the engine, the simulation results are compared with the data of engine bench test to verify the accuracy of the constructed model. For improving the engine power performance, valve timing optimization simulation to this model is carried...
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