Abstract Cognitive radio has become one of the most promising solutions for addressing the spectral under-utilization problem in wireless communication systems. As a key technology, spectrum sensing enables cognitive radios to find spectrum holes and improve spectral utilization efficiency. To exploit more spectral opportunities, wideband spectrum sensing approaches should be adopted to search multiple frequency bands at a time. However, wideband spectrum sensing systems are difficult to design, due to either high implementation complexity or high financial/energy costs. Sub-Nyquist sampling and compressed sensing play crucial roles in the efficient implementation of wideband spectrum sensing in cognitive radios. In this chapter, Sect. 6.1 presents the fundamentals of cognitive radios. A literature review of spectrum sensing algorithms is given in Sect. 6.2. Wideband spectrum sensing algorithms are then discussed in Sect. 6.3. Special attention is paid to the use of Sub-Nyquist sampling and compressed sensing techniques for realizing wideband spectrum sensing. Finally, Sect. 6.4 shows an adaptive compressed sensing approach for wideband spectrum sensing in cognitive radio networks.

关键词：无线电；无线通信系统；宽带频谱感测

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PLM software helps to manage the whole lifecycle of a product. A product's lifecycle includes all the stages that it goes through, from its initial concept, design phase, and manufacture to its final disposal. It includes several applications such as CAD, MCAD, CAM, S&A, cPDm, and DM.

关键词：中国；产品生命周期管理；PLM

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In this chapter, we propose an adaptive equalization scheme for a chaos-based digital communication system. The studied system is a discrete-time version of the one proposed by Wu and Chua that has recently been considered for optical applications. Due to the nonlinear characteristics of the transmitters and receivers and the lack of robustness of chaos synchronization, even minor channel imperfections are enough to hinder communication. Adaptive equalization is succinctly reviewed by focusing on the normalized least-mean-squares (NLMS) algorithm, which is extended to fit the studied chaotic communication system. Simulation results show that the proposed chaotic NLMS can successfully equalize the channel.

关键词：数字通信系统；自适应；混沌通信

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The objective of this project was to create a real-time, context-aware transit navigation system. The system integrates the route-planning and real-time tracking functionality provided by current systems into a single, real-time and context-aware application, combining a smartphone end-user device, such as the Apple iPhone, with a sophisticated back-end service. The completed navigation system supports unified real-time transit navigation, including walking, biking or handicapped access, across all three Chicago transit agencies: CTA buses and subway trains, Pace suburban buses, and Metra commuter rail. The back-end is built as a generic routing service, which can be used by any number of client applications. On the client side, an iPhone application has been created, with an attractive user interface and a wide selection of convenient features. The iPhone application has been published on the iTunes App store for public download. The app is downloaded by approx. 2,0003,000 users per month, and has received over 1,000 reviews, many of which are very positive

关键词：通讯设备;通勤铁路;导航系统;公共交通

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A fleet management system is the interface used by fleet vehicle operators to manage various commercial vehicles such as trucks, vans and cars used for business purpose. The system helps monitor operational costs, improve driver safety and route guidance, and ensure government regulations are met.

关键词：欧洲；车队管理系统；市场前景

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A realization of new communication media which realizes transmission of haptic information between distant places is required. Bilateral control system is an effective technique which can share tactile sensation between two systems. However the performance of the bilateral control tends to destabilize and the haptic information deteriorates under communication delay because haptic information has the bilateral informational flow property. Therefore, this paper proposes a novel method to realize simultaneity in bilateral control system under communication delay. The proposed control system is designed to realize the control goal equations for bilateral control regardless of the delay time and is designed symmetrically. Buffering the force information of the own system solves the interference between the modal space caused by the communication delay. The whole control system is stabilized by using the phase lag compensator which has the equivalent meaning of acceleration response feedback with high pass filter. The validity of the proposed method is confirmed by experiments.

关键词：加速度控制;双向控制系统;通信延迟;同时性;模态空间;

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The information and communications technology (ICT) field is undergoing a period of tremendous and rapid change. As ICT develops more rapidly, the United States Air Force needs to remain responsive and adaptive to maintain military advantages. The need to integrate ICT developments sooner than our adversaries prompted an assessment of guidelines evaluating how well the AF is doctrinally positioned from a Command and Control perspective to support integration of emerging ICT. A Delphi Study was commissioned by the 689th CCW to forecast the future of mobile Information and Communication Technology (ICT) in austere environments.

关键词：空军;指挥和控制技术;指挥控制通信;通信和广播系统

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A distributed engine control system (DECS) offering flexibility and scalability is envisioned for the next generation of propulsion controls. Perhaps the most touted benefit of a DECS is the potential to reduce the amount of harnessing which connects throughout the engine. Such a system is comprised of several network sections incorporating control nodes or data concentrators (DCs). These DCs contain control logic to perform control function computations and are connected to the full authority digital engine control (FADEC) via a high-speed data communication bus. A novel approach for analyzing and evaluating three topologies; ring, star, and bus in the context of a relevant military engine was described. In this study, the algorithm uses a particle swarm optimization process to evolve solutions to a multi-objective optimization problem. The results of this study indicate there is potential for large wire length savings in a distributed control architecture.

关键词：通信网络;推进系统;体系结构;对比;控制系统

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A DCS is an automated control system that, rather than being centralized, is distributed across an entire organization. DCS is distributed in such a way that each component or sub-system of a manufacturing plant is controlled by one or more controllers, thereby providing instructions to different parts of the plant.

关键词：美国；分布式控制系统；信息技术

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This research grant provided the opportunity to research and deploy beneficial transportation technologies to support transit needs. Working with the Transit Authority of Northern Kentucky (TANK), solutions were developed that can apply to transit agencies and emergency management across the country. As a result of this research, technologies were developed and deployed to Wi-Fi-enable buses, send video content to buses in transit, send riders service alerts via email and text, visualize the cost and environmental advantages of public transit, and provide location aware trip planning and other informational services via the Web, desktop gadgets, mobile apps, text messages, and kiosks.

关键词：信息系统;公共交通;物流;安全;公交车;电子信箱;应急管理;

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