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The wireless sensors deployed at the highway can ensure the safety of the traveling vehicles. However, the ribbon deployed wireless sensor network in the roadside infrastructure can easily to generate energy hole. Cooperative communication between sensors and vehicles is an effective way to improve this situation and reduce the energy consumption of the sensors. A cooperative relay selection algorithm...
Mobile crowdsensing is a new paradigm, sharing sensing data collected by mobile devices such as smartphones and tablets. As mobile devices are usually connected by an opportunistic network for data transfer, it is hard to acknowledge the contribution of each mobile user in network forwarding and find a sustainable incentive mechanism. In this article, we propose a software defined opportunistic network...
As a kind of parallel light, sunlight can be used for positioning. Light sensors are attached to each side of an octagona cylinder to achieve solar orientation. By theoretical analysis, design and test of a prototype, a fixed structure test method for sun orientation is verified. The instrument presented can be a foundation of new navigation device.
In this paper, we consider a cognitive radio network in which a secondary user (SU) has opportunities to access one of multiple channels licensed by several primary users (PUs). Before transmission, SU should sequentially decide which channel to explore and in what sequence, as well as whether to access or to sleep. Our goal is to design a joint spectrum sensing and transmission strategy for SU to...
Recently, Cognitive network is growing more and more attractive due to its capability of dynamic spectrum usage. When the dynamic spectrum is wideband, a sequential sensing scheme is proposed to sense the spectrum with low system complexity. Conventionally, parameters of sequential sensing are optimized subject to sensing time and detection performance constraints, such as false alarm and miss detection...
The sensing performance of local detection in cognitive radio systems will be degraded when the channel experience fading and shadowing, and hidden terminal problem is inevitable for the primary transmitter-sensing. To overcome this problem, cooperative spectrum sensing has been proposed. We propose a twice-cooperative sensing algorithm to improve the sensing performance. By comparing to the single-cooperative,...
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