第三代无线通信及相关半导体技术

介绍了第三代无线通信系统，着重展望第三代无线通信系统用的新型半导体器件与技术的发展前景。     

TD—SCDMA的动态信道分配

TD-SCDMA是由中国提出并被ITU所接受的第三代无线通信标准,并已成为第三代无线通信系统UMTS和IMT2000国际电信标准大家庭中的重要成员.     

4G——新一代的无线通信系统

<正>1何谓4G第四代无线通信系统4G(Fourth-Generation Communications System)是目前所预言的下一代无线通信系统,也可以说是第三代无线通信系统3G的延续(Beyond 3G)。国际电信联盟(ITU)已提出4G(IMT-Advanced)系统的目标,虽然现在尚未有4G规格标准     

以知识、经验和智慧 报效祖国——访无线通信领域世界一流学者李建业博士

<正> 连宇通信公司(LinkAir communication)是第三代无线通信系统系列新型专利技术LAS—CDMA的开发者。LAS—CDMA系列专利技术显著扩大了系统容量,它所提供的容量比现存的第二代标准高20倍,比cdma2000及W-CDMA等高4倍以上,是第三代无线通信系统发展最快的技术。与传统CDMA相     

大唐电信的无线通信业务

大唐电信的无线通信业务主要包括无线通信技术SCDMA和TD-SCDMA。目前大唐还处于2G或者2．5G通信技术阶段，在将来，大唐无线通信系统中将会出现第三代无线通信的身影。     

4G无线通信的网络安全问题思考

在计算机技术不断与无线通信结合进程中,移动通信系统经历了1G（第一代）、2G（第二代）、3G（第三代）发展历程,同时逐渐向全IP化、无处不在的4G（下一代通用无线通信系统）演进。而无线通信的网络安全作为对发展移动通信系统造成影响的关键问题,始终是业界与学界研究的热点与重点。     

4G无线通信的网络安全问题思考

在计算机技术不断与无线通信结合进程中,移动通信系统经历了1G(第一代)、2G(第二代)、3G(第三代)发展历程,同时逐渐向全IP化、无处不在的4G(下一代通用无线通信系统)演进。而无线通信的网络安全作为对发展移动通信系统造成影响的关键问题,始终是业界与学界研究的热点与重点。     

无线芯片 风光无限

随着无线技术的发展,特别是关于第三代移动通信系统开发的突破性进展,基于ＣＤＭＡ平台的第三代移动通信注定将成为本世纪末全球通信业最引人关注的亮点,而能否实现第三代各种应用最终要取决于无线通信芯片技术的发展。在过去的一年中,三网融合的大趋势推动了芯片业在移动通讯、无线互联网、无线数据传输和无线电话方面的发展,且发展速度远远超过了ＰＣ机芯片的速度。专家预言,通信芯片,特别是支持第二代各种应用的无线通信芯片将占据芯片业最大的市场。无线通信芯片市场商机无限据预测,无线通信芯片的需求将在未来４年中增长２２０…     

用软件无线电实现第三代移动通信系统的无线接入部分

软件无线电技术以其强大的灵活性而成为未来无线通信发展的方向;主要以ＣＤＭＡ技术为基础和第三代移动通信系统是当前研究的热门和关键技术,本文就如何用软件无线电的体系结构实现第三代移动通信系统经给予了探讨。     

无线通信发展走势

简要介绍了第三代、第四代移动通信系统以及移动通信网与因特网、移动通信网与因特网、移动通信网与固定通信网结合等问题,从多个视角探讨了无线通信的发展趋势。     

Degradation of oxide films due to radiation effects in exposure to plasmas in sputter deposition and backsputtering

The particle bombardment and other effects occurring in plasma systems used to process semiconductor devices have been described and characterized, in particular in the dc and RF diode and dc triode systems commonly used for processing. DC diode systems and RF diode systems are shown to cause degradaztion in processed devices due to energetic particle bombardment, as do de triode systems. In triode systems magnetic field protection is of assistance; in dc and RF diodes, grid systems may be necessary. Since the degradation of processed devices is often not annealable, some protection of devices from degradation during processing may be essential.     

Foreword, May 1979

Solid-state devices have been key to the development of todays microwave systems. RADARs, communications systems, and EW systems currently in use offer advantages in performance, size, reliability, and cost that would certainly not be possible without these devices. Equally certain is the fact that the future course of microwave and millimeter-wave systems will be determined by solid-state devices currently under development.     

Three-Terminal Artificial Olfactory Sensors based on Emerging Materials: Mechanism and Application

Over the past several years, a variety of hardware-based artificial sensory systems, including artificial skin, electronic noses, and artificial retinas, have attracted considerable research interest in advanced artificial intelligence systems. The integration of sensing and computing functions in single or multiple connected self-adaptive field-effect transistor (FET)-structured sensory devices to implement artificial olfactory systems for in-sensor computing has recently attracted increasing attention. In this review, the development status of FET-based gas sensory devices is focused on. The mechanisms of sensory FET devices, gas-recognition materials, strategies for improving sensing performance, and the integration of sensory devices into the artificial olfactory system are discussed. Finally, the further development of FET-based sensory devices for artificial olfactory systems and their great potential for next-generation intelligent sensory systems are discussed in broad fields such as environmental monitoring, health care, and military industries.     

Practical surface acoustic wave devices

A tutorial discussion is presented on selected surface acoustic wave (SAW) devices for the use of engineers and electronic systems designers. Currently practical components for use in radar systems, communications systems, and as frequency domain filters are described. Emphasis is placed on nondispersive and dispersive delay lines, devices for generating and detecting various radar waveforms, devices for generating and detecting fixed and programmable biphase and multiphase codes, and broad-band and narrow-band filters. The device possibilities of several new approaches are described, including multistrip couplers, nonlinear convolvers, reflective structures, and overlay films. It is concluded that, while SAW devices have found many applications in large radar systems because of their size, cost effectiveness, and reliability, wide-scale applications, for example as frequency domain filters, will be needed to justify continued research in this field. Wide-scale applications will come as systems engineers realize the potential of these devices and confidently design them into their systems.     

The development of device lithography

Lithography has been the principal pacing element in the development of complex integrated circuits. Although major programs in electron-beam lithography and X-ray lithography have developed new systems with smaller feature capability, the optical systems remain the only candidates for large-volume device production. Scanning and step-and-repeat optical systems have been developed for the next generation of devices with 1-µm features. Electron beams are used for mask fabrication and direct exposure of special devices of exceptional value or for prototypes. X-ray and ion systems are being developed for future devices.     

A statistical approach to characterizing the reliability of systems utilizing HBT devices

This paper describes a statistical approach to simulating the reliability of systems with HBT devices. Compared to the conventional worst-case method, the described approach utilizes statistical reliability information of the HBT individual devices, along with analysis on the critical paths of the system, to provide more accurate and more comprehensive reliability evaluation of the systems utilizing HBT devices.     

Signal Processing with Charge-Coupled Devices

The purpose of this paper is to discuss applications of charge-coupled devices in signal processing systems. Both analog and digital CCD concepts are considered. Recent developments in high-speed (~100 MHz) CCD's are discussed, and the uses of high-speed CCD and surface-acoustic wave (SAW) devices together are considered. Examples of the applications of CCD's in electro-optical systems, secure voice communication systems, sonar systems and radar systems are given. Finally, projections for future uses of CCD's in signal processing systems are presented.     

Flexible energy storage devices for wearable bioelectronics

With the growing market of wearable devices for smart sensing and personalized healthcare applications,energy stor-age devices that ensure stable power supply and can be constructed in flexible platforms have attracted tremendous research in-terests.A variety of active materials and fabrication strategies of flexible energy storage devices have been intensively studied in recent years,especially for integrated self-powered systems and biosensing.A series of materials and applications for flex-ible energy storage devices have been studied in recent years.In this review,the commonly adopted fabrication methods of flex-ible energy storage devices are introduced.Besides,recent advances in integrating these energy devices into flexible self-powered systems are presented.Furthermore,the applications of flexible energy storage devices for biosensing are summar-ized.Finally,the prospects and challenges of the self-powered sensing system for wearable electronics are discussed.     

Architectural considerations for photonic switching networks

Photonic technologies are reviewed that could become important components of future telecommunication systems. Photonic devices and systems are divided into two classes according to the function they perform. The first class, relational, refers to devices, that map the input channels to the output channels under external control. The second class, logic, perform some type or combination of Boolean logic functions. Some of the strengths and weaknesses of operating in the photonic domain are presented. Relational devices and their applications are discussed. Optical logic devices and their potential applications are reviewed     

Signal processing with charge-coupled devices

The purpose of this paper is to discuss applications of charge-coupled devices in signal processing systems. Both analog and digital CCD concepts are considered. Recent developments in high-speed (∼100 MHz) CCD's are discussed, and the uses of high-speed CCD and surface-acoustic wave (SAW) devices together are considered. Examples of the applications of CCD's in electro-optical systems, secure voice communication systems, sonar systems and radar systems are given. Finally, projections for future uses of CCD's in signal processing systems are presented.