浅析无线通信技术的发展

随着科技的快速发展和经济水平的不断提高,我国进入到无线通信技术飞速发展的时代,无线通信技术应用广泛,且无线通信技术的热点不断涌现,促进了无线通信产业的可持续发展。本文简要分析了无线通信技术的发展现状,总结了无线通信技术的应用,并对无线通信技术的发展趋势作出了预测。     

超宽带无线通信关键技术探讨

作为一种新型的无线通信技术,超宽带无线通信技术的应用普遍程度逐渐提升.与其他无线通信技术相比,超宽带无线通信技术更好地解决了功耗较大以及成本较高等问题.随着超宽带无线通信技术优势的逐渐发挥,人们对超宽带无线通信技术越来越重视本文对超宽带无线通信关键技术进行研究.     

点对多点无线通信系统设计与实现

本文就点对多点无线通信系统设计与实现这个话题进行讨论,首先就点对多点无线通信系统处理进行分析,其次就点对多点无线通信系统设计给予阐述,最后就点对多点无线通信系统在应用无线通信系统程序、信号发送系统应用、UCSRB寄存器的接收应用、无线通信接收流程等方面的实现进行重点说明,促进了无线通信事业的发展。     

无线通信技术发展分析

在分析国内外无线通信技术的基础上,指出了当前无线通信的需求特点,深入分析了无线通信技术的发展趋势,为今后无线通信产品的研发提供了参考。     

地铁中的无线通信系统及其制式

在当前地铁运行的过程中,无线通信系统发挥了重要的作用,为地铁正常行驶以及和地面管理中心的联系提供了便利条件。为了更好的发挥地铁无线通信系统的效果要采用合理的系统制式,因此本文针对地铁中的专用无线通信系统、警用无线通信系统、列车控制系统中的车-地无线通信以及公众无线通信系统展开研究和分析,为以后地铁无线通信系统整合提供一些参考和借鉴,以促进我国地铁无线通信系统的建设。     

无线通信中的抗干扰技术

随着无线通信技术的不断发展,给人们的生产生活带来了诸多便利,如何进一步扩大无线通信的范围,提高无线通信的效率成为无线通信技术发展的瓶颈。对无线通信系统而言,信号在传输过程中受到来自复杂电磁环境的干扰成为影响其通信效率的重要因素,因此对无线通信的抗干扰技术进行研究十分必要。本文主要针对无线通信中的常见干扰因素进行了分析,并对当前无线通信中的抗干扰技术进行了研究与阐述。     

基于Android手机的无线通信数据传输速率优化研究

为提高无线通信网络中传输数据的速率,减少响应延时,提出基于Android手机的无线通信数据传输速率优化研究.通过分析无线通信网络数据传输现状及发展趋势,从无线通信数据采集、基于Android手机的服务器端通信数据存储和无线通信数据传输响应三方面提出一种全新的数据传输方法.实验表明,所提方法对无线通信网络中的数据传输速率...     

无线通信系统中MCU研究与设计

针对传统无线通信系统中存在的一些缺点,对无线通信系统中的MCU进行研究与设计.首先,介绍无线通信中的嵌入式系统和无线通信模块;其次通过对系统的总体需求进行分析,设计无线通信系统基于MCU的软硬件架构,在无线通信模块中设计一个模拟的MCU,其MCU的硬件功能是通过软件接口来提供.在无线通信系统MCU的详细设计部分介绍了A...     

APT攻击下的无线通信网络最优主动防御决策模型

最优主动防御决策可以保障无线通信网络的安全稳定性,为了提高无线通信网络的防御效果,提出了APT攻击下的无线通信网络最优主动防御决策模型。关联无线通信网络日志,构建APT攻击对象集合,通过反馈相容系数计算APT攻击事件的绝对相容度,并预测APT攻击行为。基于APT攻击源对无线通信网络攻击的信道带宽,获取无线通信网络受到APT攻击的位置,利用无线通信网络节点的权值系数,提取无线通信网络的APT攻击特征。利用攻防图,计算得到APT攻击对无线通信网络的损害程度,通过定义无线通信网络的安全状态,构建了无线通信网络最优主动防御决策模型。实验结果表明,所提模型在防御无线通信网络的APT攻击时,可以将攻击数据包拒包率和吞吐量分别提高到90%以上和16 000 bit/s以上,并且时延较低,具有更好的防御效果。     

无线通信设备的电磁干扰研究

现代信息技术的发展使得无线通信设备的应用越来越广泛,无线通信设备被应用到很多的行业,方便了大家的生活.但是无线通信设备的应用过程中会受到电磁干扰的影响,使得无线通信设备的应用受到了一定的阻碍,电磁干扰也会给无线通信设备造成一定的安全问题,给人们带来了安全隐患.本文就无线通信设备的电磁干扰研究进行探讨,希望能够提高无线通信设备的抗干扰性.     

Receiver Front-End Circuits for Future Generations of Wireless Communications

In this paper, new receiver concepts and CMOS circuits for future wireless communications applications are introduced. The concepts derived are applied to a few classes of wireless communications standards that are broad-band at radio frequencies and/or require a broad-band baseband circuitry. Multimode multiband operation and adaptivity as key requirements for future generation receivers are highlighted throughout the paper. The tradeoffs between power consumption, noise figure and linearity performance of low-noise amplifiers, mixers, and intermediate frequency filters are considered too.     

国外无线通信抗干扰技术研究进展

分析了当前无线通信抗干扰主要手段存在的不足,指出多维抗干扰和认知抗干扰是当前研究的主要热点。进一步介绍了非协同跳频(UFH)、消息驱动的跳频(MDFH)等国外近年提出的无线通信抗干扰新概念和技术及其研究情况,并总结了无线通信抗干扰措施的未来发展趋势,提出了发展建议。相关内容可为无线通信抗干扰技术的深入研究提供参考。     

Grey systems theory applications to wireless communications

This paper discusses grey systems theory (GST) applications in wireless communications and highlights its potential to cognitive radio. GST consists of information theory concepts and practical algorithms developed to address situations where information is incomplete and affected by random uncertainties. Two GST concepts, grey relational analysis (GRA) and grey model (GM) prediction theory are discussed. GRA provides a method to quantify the similarity between a reference data series and set of data while GM is used for modeling time series data and enables prediction of future values with limited data points and unknown probability distributions. These two techniques are surveyed with respect to their applications to wireless communications. Their application to predictive Cognitive Radio and as a similarity measure for case based reasoning cognitive engines is highlighted. A GRA based Automatic Modulation Classification (AMC) algorithm is applied to digital communications signals with preliminary results shown in simulation.     

Wireless ATM LAN with and without infrastructure

We consider wireless ATM concepts for small LANs, especially for SOHO and future consumer applications. We describe a wireless ATM LAN framework architecture that supports wireless ATM communications in environments with and without fixed ATM infrastructure. For the configuration with an ATM infrastructure, a distributed ATM switched backbone is proposed, which enables a smart ATM switching element to be embedded in every wireless and fixed access point. For bandwidth efficiency and ease of operation (place-and-play), we also propose an ad hoc wireless ATM LAN concept based on the same 5 GHz wireless ATM air interface as is currently under standardization in the ETSI/BRAN and ATM Forum. Unlike CSMA-based ad hoc systems such as HIPERLAN and IEEE802.11, our ad hoc wireless ATM system makes QoS management feasible in an infrastructureless environment by using resource reservation and scheduled medium access protocol. Since cost scalability is essential throughout our system design, we consider forwarding between ad hoc subnets and interworking with the fixed network as important but optional features     

Universal Intelligent Small Cell (UnISCell) for next generation cellular networks

Exploring innovative cellular architectures to achieve enhanced system capacity and good coverage has become a critical issue towards realizing the next generation of wireless communications. In this context, this paper proposes a novel concept of Universal Intelligent Small Cell (UnISCell) for enabling the densification of the next generation of cellular networks. The proposed novel concept envisions an integrated platform of providing a strong linkage between different stakeholders such as street lighting networks, landline telephone networks and future wireless networks, and is universal in nature being independent of the operating frequency bands and traffic types. The main motivating factors for the proposed small cell concept are the need of public infrastructure re-engineering, and the recent advances in several enabling technologies. First, we highlight the main concepts of the proposed UnISCell platform. Subsequently, we present two deployment scenarios for the proposed UnISCell concept considering infrastructure sharing and service sharing as important aspects. We then describe the key future technologies for enabling the proposed UnISCell concept and present a use case example with the help of numerical results. Finally, we conclude this article by providing some interesting future recommendations.     

New concepts and technologies for achieving highly reliable andhigh-capacity multimedia wireless communications systems

The rapid growth of multimedia wireless communications services forces the development of advanced digital wireless systems with high reliability and high speed as well as flexibility for varying traffic conditions. To achieve such advanced wireless systems. New system design concepts different from the conventional ones aiming at increasing system capacity for voice transmission would be required. Since multimedia wireless communications require high quality, high speed, and high flexibility as well as temporary and spatial control of traffic under severe fading environments, the so-called conventional system design concept will be insufficient. New system design concepts and techniques for achieving highly reliable and high-capacity multimedia wireless communications are discussed using both time division multiple access (TDMA) and code division multiple access (CDMA) systems. The demands for high-speed and high-reliability mobile, personal, and multimedia wireless communications services strongly require matching with the trunk network constructed by a broadband optical fiber system or wired system     

宽带无线TDMA系统的自适应调制技术

无线多媒体业务的快速增长促进了宽带无线ＴＤＭＡ通信系统的研究和开发,宽带无线ＴＤＭＡ通信系统方面出现了一些新的技术和系统设计概念。讨论宽带无线ＴＤＭＡ系统中采用的自适应调制技术。     

Concepts of Simultaneous Use in Mobile and Wireless Communications

Wireless communication research is evolving towards integration, inter-working and convergence of wireless systems, which will lead to several concepts of simultaneous use. In the present paper, a coherent set of 10 concepts of simultaneous use is identified, and structured into a space of simultaneous use, where services, systems and operators act as building components. A high level analysis is performed, where the pros and cons of the different concepts are identified. Illustrative examples are also provided for some concepts. Several parameters are listed for the evaluation and comparison of simultaneous use concepts (e.g., cost, throughput and complexity), depending on taking either a users or an operators perspective. One of the largest benefits of this systematic identification of simultaneous use concepts is the identification, from the perspective of users and operators, of essential R&D issues on inter-working and integration, which will lead to a promising pervasive wireless communications future.     

无线数据通信网建设的探讨

本文介绍了无线数据通信网的概念及其接入方式，并对江苏省无线数据通信网建设作了初步探讨，基于无线数据通信的优点和特性，其有关广泛的应用前景和巨大的市场潜力，对国民经济信息化和对外经济发展有着重要意义。