In chaos-based communications, it is essential to know and to control the spectral features of the chaotic signals to be transmitted, since every communication channel is bandlimited to some extent. In this chapter, we review a proposal of discrete-time communication system using chaotic synchronization in which the spectrum of the transmitted signals can be moderately shaped. Numerical studies on the Lyapunov exponents of the generated signals are presented and related to the performance of this chaotic communication system.

关键词：通信；离散通信；混沌信号

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OLEDs are organic LEDs that use organic materials to produce light. The organic material is packed between conductors that light up when electricity is passed through them. OLED display units contain many such thin films of several types of organic molecules that produce various colors of light.

关键词：OLED；有机材料；光二极管；电流

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Communication is the action of transmitting and eventually receiving another message in response, as in an exchange of e-mails, for example. In a technical approach, one may say that communication is the process that involves the transmission and reception of messages between a source and an addressee receiver, in which information transmitted through physical resources or equipment, and technological devices are coded at source and decrypted at the destination using agreed systems of signs or sound symbols, written or iconographic. Schematically (Figure 15.1), there are five elements in any communication system, namely, an emitter, an encoder, a transmission channel, a decoder, and a receiver. The encoder handles the message, so it passes through the channel, and the decoder carries out the reverse process. In order to be practical and safe, the construction of a communication system may rennire other comnonents.

关键词：通信系统;发射器;编码器

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Digital communications have evolved to meet the demand of consumers for increasing access to Internet browsing, TV, Video on Demand, interactive games, and social networking. This data rate increase is achieved by using advanced signal processing techniques, more complex modulations, and wider signal bandwidths. Therefore, high-performance receivers, able to capture wide-bandwidth signals, are required for high-end consumer communication and infrastructure equipments. For instance, this includes Cable and Satellite home gateways, cellular infrastructure transceivers, and white-space spectrum sensing.

关键词：Olivier Jamin

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According to DOD, corrosion can significantly affect the cost of facility maintenance and the expected service life of DOD facilities. While corrosion is not always highly visible, it can lead to structural failure, loss of capital investment, and environmental damage. In response to a congressional request, GAO reviewed DOD's corrosion prevention and control program for facilities and infrastructure. In this report, GAO assessed the extent that DOD (1) met reporting requirements, (2) maintained accurate return-on-investment data in its records, and (3) fully informed relevant officials of its corrosion-control efforts. GAO reviewed DOD policies and plans, met with corrosion-control officials, and visited and interviewed officials at 32 installations.

关键词：缓蚀;国防部;管理规划与控制;通信

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In recent decades, optical LOS communications such as flag semaphore or flashing light have atrophied to the point where, if they are required, U.S. Naval forces are at a distinct disadvantage. RF communications have become critical to nearly all operations, but this capability comes at the cost of disclosing the location of operations. Depending on the platform, these RF communications can become a critical vulnerability. EMCON attempts to minimize this vulnerability through the elimination of any RF emissions from a ship, but communication requirements in recent years have essentially prevented a complete suppression of RF emissions. This work proposes mitigating emissions vulnerability by utilizing a new method of optical communications at LOS visual ranges reminiscent of flag semaphore. Tactical QR code communications streaming digital data through optical signaling has the potential to provide tactical communications at a moderate range, allowing critical communications to be relayed to and from off-ship platforms. Additional technological advances can be used to overcome current range, security, reliability, and throughput barriers. This project demonstrates how a combination of essential technical capabilities can be used to establish a QR code communications system as a potentially useful approach for tactical operations.

关键词：光通信；信号；信息隐藏；编码；通信和广播系统;

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Multi-robot systems are a major research topic in robotics. Designing, testing and deploying in the real world a large number of aerial robots is a concrete possibility due to the recent technological advances. The first section of this chapter treats the different aspects of cooperation in a multi-agent systems. A cooperative control should be designed in terms of the available feedback information. A cascade-type guidance law is proposed, followed by consensus approach and flocking behavior. Since information flow over the network changes over time, cooperative control must react accordingly but ensure group cooperative behavior which is the major issue in analysis and synthesis. Connectivity and convergence of formations are also studied. Team approach is followed by deterministic decision making. Plans may be required for a team of aerial robots to plan for sensing, plan for action or plan for communication. Distributed receding horizon control as well as conflict resolution, artificial potentials and symbolic planning are thus analyzed. Then, association with limited communications is studied, followed by genetic algorithms and game theory reasoning. Next, multi-agent decision making under uncertainty is considered, formulating the Bayesian decentralized team decision problem, with and without explicit communication. Algorithms for optimal planning are then introduced as well as for task allocation and distributed chance constrained task allocation. Finally, some case studies are presented such as reconnaissance mission that can be defined as the road search problem or the general vehicle routing problem. Then, an approach is considered to coordinate a group of aerial robots without a central supervision, by using only local interactions between the robots. The third case is the optimization of perimeter patrol operation. If an aerial robot must be close from a location to monitor it correctly and the number of aerial robots does not allow covering each site simultaneously, a path planning problem arises. Finally stochastic strategies for surveillance are presented.

关键词：多机器人系统；通信；滚动时域控制

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This chapter presents a selection of potential deployment and application scenarios for Cognitive Radio (CR). The chapter goes beyond a simple review of scenarios by considering the viewpoints of several key players in wireless communication research and applications: regulators, standardisation bodies, researchers from the engineering and economic/business communities, industrial partners and companies. In this framework, two key issues related to scenario definition are addressed: (1) An analysis of players that determine the evolution of scenarios, including both technical and economic/business aspects; (2) Study of approaches for classification of CR deployment scenarios, with the aim of identifying a set of elements that allow creating taxonomy capable of fitting existing and new scenarios relevant to CR and SDR. The chapter opens with an overview of CR scenarios proposed by ITU-R in Sect. 2.1. It is followed by Sect. 2.2 that describes the CR use cases envisaged by ETSI. Section 2.3 offers examples of CR scenarios developed in several research projects. The impact of different regulatory and environmental conditions on application scenarios is addressed in Sect. 2.4, which provides a comparison between feasible scenarios in India and Finland. Section 2.5 highlights the issue of growing spectrum demand for mobile services and suggests how the CR may be positioned to help meeting that demand. This is followed up in Sect. 2.6 which provides analysis of upcoming mobile scenarios in Europe focusing on the concept of Licensed Shared Access as defined based on activities carried out in ETSI and CEPT. Next, the chapter moves on to aspects related to planning and classification of scenarios. Section 2.7 proposes a scenario planning methodology aiming to support planning and classification of scenarios for CR and to help identify relevant business models. Section 2.8 proposes an approach to the definition of a taxonomy of CR application scenarios, aiming at fitting present and future applications in a coherent framework. Finally, Sect. 2.9 offers an example of very practical application scenario for deployment of White Space Devices in TV Bands as established by a harmonised European standard EN 301 598.

关键词：认知无线电；移动方案；通信

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Industrial robotics is a technology used to automate a variety of manufacturing processes across the Automotive, Food and Beverage, and Electrical and Electronics industries.

关键词：工业机器人；中国；市场前景

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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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