4G通信系统关键技术浅析

首先提出了3G系统的局限性由此概括介绍了4G的特点和关键技术．最后对4G网络结构作了简单介绍。     

4G通信系统关键技术浅析

本文首先提出了3G系统的局限性，由此概括介绍了4G的特点和关键技术，最后对4G网络结构作了简单介绍。     

4G移动通信关键技术浅析

移动通信已成为当代通信领域内发展潜力最大、市场前景最广的热点技术。本文概要介绍4G移动通信系统的主要特点和4G系统中采用的关键技术。     

4G移动通信关键技术

移动通信已成为当代通信领域内发展潜力最大、市场前景最广的热点技术。4G是多种接入技术的综合系统,基于一个公共的平台,实现各种技术的无缝链接。如果说1G就是打电话,2G能够发短信、传图片,3G可以看电视、浏览互联网……那么4G呢？未来移动通信的研究,越来越被重视,并逐步形成研究热潮。本文将概要介绍移动通信发展历程、4G移动通信系统的主要特点和4G系统中采用的关键技术。     

4G移动通信关键技术

移动通信已成为当代通信领域内发展潜力最大、市场前景最广的热点技术。4G是多种接入技术的综合系统,基于一个公共的平台,实现各种技术的无缝链接。如果说1G就是打电话,2G能够发短信、传图片,3G可以看电视、浏览互联网……那么4G呢?未来移动通信的研究,越来越被重视,并逐步形成研究热潮。本文将概要介绍移动通信发展历程、4G移动通信系统的主要特点和4G系统中采用的关键技术。     

基于第四代移动通信系统的关键技术研究

当今世界的移动通信技术飞速发展，而移动通信得市场也不断繁荣，人们对移动通信系统的各种需求日益增加。移动通信未来的发展度演进问题成了世人瞩目的焦点话题。本文首先讨论了第四代移动通信系统（简称4G）的概念和技术特点。然后详细分析了4G可能采用的一些关键技术，并在最后展望了4C通信系统的未来。     

论第四代移动通信(4G)关键技术

随着科学技术水平的不断提高,移动通信技术也得到了空前的发展,目前使用的通信技术已经是第三代移动通信(3G),3G通信技术在之前的通信技术基础上增加了不同种类的宽带信息业务,具有明显的先进性。但由于3G技术的宽带业务是基于上代网络,所以其智能化局限性较明显。故在3G时代还未完成之时,全球通信行业都已开始了下一代移动通信技术——4G的探究。     

第四代移动通信系统概述

本文概述了第四代移动通信系统产生的背景、系统特点、网络结构及关键技术，同时对第四代移动通信-这一前瞻性的个人通信系统商业化进程所面临的问题进行了阐述。     

分析第四代移动通信技术(4G)的关键技术

以第四代移动通信技术作为切入点,分别介绍了OFDM正交频分复用技术、无线定位技术、以及IPv6协议技术的基本概念、特点、以及应用价值,指出了以上技术在第四代移动通信领域中的应用价值。     

第四代移动通信系统的关键技术及网络结构

首先介绍了第四代移动通信系统的概念和特点,接着探讨了4G系统的关键技术,包括多输入多输出技术、正交频分复用技术、软件无线电、智能天线技术,最后讨论了4G系统的网络结构.     

基于无线通信网络融合的智能家居系统研究

设计完成了一种基于Zigbee,WLAN,GSM/GPRS/3G等各种无线通信技术融合应用的智能家居系统.分别从硬件设计、网络应用、软件设计等方面分析了系统的组成.多种无线通信技术令系统有更大的灵活性,符合家庭网络的通信特点.将安防报警功能、远程视频监控、远程控制等多项功能融为一体,合力打造家居生活的智能化.     

THe callingSM network: A global wireless communication system

There is a very large demand for basic telephone service in developing nations, and remote parts of industrialized nations, which cannot be met by conventional wireline and cellular systems. This is the world' largest unserved market. We describe a system which uses recent advances in active phased arrays, fast-packet switching technology, adaptive routeing, and light spacecraft technology, in part based on the work of the Jet Propulsion Laboratory and on recently-declassified work done on the Strategic Defense Initiative, to make it possible to address this market with a global telephone network based on a large low-Earth-orbit constellation of identical satellites. A telephone utility can use such a network to provide the same modern basic and enhanced telephone services offered by telephone utilities in the urban centres of fully-industrialized nations. Economies of scale permit capital and operating costs per subscriber low enough to provide a service to all subscribers, regardless of location, at prices comparable to the same services in urban areas of industrialized nations, while generating operating profits great enough to attract the capital needed for its construction. The bandwidth needed to support the capacity needed to gain these economies of scale requires that the system use K_a-band frequencies. This choice of frequencies places unusual constraints on the network design, and in particular forces the use of a large number of satellites. Global demand for basic and enhanced telephone service is great enough to support at least three networks of the size described herein. The volume of advanced components, and services such as launch services, required to construct and replace these networks is sufficient to propel certain industries to market leadership positions in the early 21st Century.     

远程无线网络语音通信控制系统设计

由于语音通信受环境的影响较大,导致传统的语音通信控制系统无法满足用户需求,控制质量较低。因此,构建远程无线网络语音通信控制系统,系统中的语音识别模块利用CG6565语音卡进行语音信号的收集,并对其进行降噪处理。降噪后的语音信号被转换成便于处理的数字信号,并将数字信号的特性参数提取出来。语音识别模块对特性参数进行识别、调整和测量后组成语音文件夹,并将语音文件夹反馈到远程无线网络控制模块。远程无线网络控制模块对语音文件夹中的语音文件进行一系列的处理,处理后的语音文件被传输到用户手中,实现系统对用户设备的远程语音控制。软件给出了语音通信信号的目标函数,以及该目标函数的调用代码。实验结果表明,所设计的系统具有较高的控制效率和控制准确率,控制质量总体较高。     

Low-energy wireless communication network design

Energy-efficient wireless communication network design is an important and challenging problem. Its difficulty lies in the fact that the overall performance depends, in a coupled way, on the following subsystems: antenna, power amplifier, modulation, error control coding, and network protocols. In addition, given an energy constraint, improved operation of one of the aforementioned subsystems may not yield better overall performance. Thus, to optimize performance one must account for the coupling among the above subsystems and simultaneously optimize their operation under an energy constraint. In this article we present a generic integrated design methodology that is suitable for many kinds of mobile systems and achieves global optimization under an energy constraint. By pointing out some important connections among different layers in the design procedure, we explain why our integrated design methodology is better than traditional design methodologies. We present numerical results of the application of our design methodology to a situational awareness scenario in a mobile wireless network with different mobility models. These results illustrate the improvement in performance that our integrated design methodology achieves over traditional design methodologies, and the tradeoff between energy consumption and performance.     

基于云计算与TD-SCDMA无线通信网络下载系统

下载是无线通信网络的一项重要功能,为了提高无线通信网络的下载性能,设计一种基于云计算与TD-SCDMA无线通信网络下载系统。首先对当前无线通信网络下载研究进行分析,指出它们存在的一些局限性,然后将云计算的分布式处理功能融入到TD-SCDMA无线通信网络下载系统,改善无线通信网络下载系统的性能,并对具体实现过程进行阐述,最后采用仿真实验对系统的性能进行测试。实验结果表明,该系统提升了无线通信系统的下载速度,减少了数据下载的误码率,具有较高的实验应用价值。     

Neural network optimization for energy-optimal cooperative computing in wireless communication system

Thanks to the rapidly development of optimization algorithm, more energy can be saved in the communication system when executing an application. In recent years, allocating limited resources in a cooperative manner to maximize energy efficiency in emerging sensor networks has attracted a lot of attention. In this paper, a one-layer projection neural network subject to linear equalities and bound constraints is introduced and applied in mobile wireless sensor network to make it energy-efficient by reasonably allocating local and remote data sizes when processing an application within a certain period of time. Firstly, an optimal partition to minimize the total energy consumption of the local and helper sensor nodes is proposed. Then, the neural network model is described and the optimality and convergence of the proposed model are analyzed. Finally, some simulation results are given to show that the proposed algorithm is very effective to solve the energy efficient cooperative computing.     

软交换在无线通信网中的应用

在无线通信中，通过分组交换实现语音传输与传统的通过PSTN在技术上有很大的不同。在VoIP中，语音信号以数据报的形式在专用或公用IP网上传输，而不是通过电路交换在PSTN网中传输。在传统的蜂窝网中，语音信号是通过移动交换中心（MSC）进行电路交换。软交换在3G中的应用本文重点分析软交换在UMTS标准中的应用。UMTS标准现有三个版本，分别是R99、R4和R5。简言之，在R99中，无线核心网是基于ATM的，因此MSC必须升级以满足ATM接入。在R4中，MSC被分解为软交换设备（MSCServers）和媒体网关（MediaGateway），前者实现MS…     

关于配网通信中无线通信技术的探讨研究

本文介绍了配网自动化的信息,还解析了现阶段使用的配网通信技术的优点以及缺点等一系列问题,并根据实际需要进行了比较,最终还将配网通信中的无线通信技术进行细致地讨论.     

地铁专用无线通信网络覆盖及场强计算

地铁中无线信号的传播环境非常复杂,给无线信号的覆盖带来许多困难,文章着重论述了地铁中不同空间环境下专用无线信号的覆盖方案及场强覆盖计算,并综合了合各厂商产品的技术指标特性以及在地铁无线覆盖设计方面的经验,给出了主要射频、漏泄同轴电缆等相关场强覆盖所需指标,对地铁专用无线覆盖设计具有一定参考价值。     

Attack modeling and intrusion detection system for 5G wireless communication network

Research has been going around the globe to overcome the challenges that are associated with the increase in the number of users, such as interference management, load sharing, and increased capacity. 5G is emerging as a budding prospect for fulfilling demand and overcoming these challenges. For meeting the increased demands, new technologies such as relays in device‐to‐device communication and small cell access points have been introduced. However, these introductions have opened up security issues in the 5G wireless communication networks. This article focuses on security issues of the 5G wireless communication networks and analyzes the effect of a bandwidth spoofing attack using game theory on the small cell access point in 5G wireless communication network. This article also proposes an adaptive intrusion detection system using a hidden Markov Model for detecting an intrusion on small cell access point in a 5G wireless communication networks.