基于无线传感网的矿井环境监测系统设计

由于ZigBee无线通信技术具有低功耗、低成本、应用简单等特点,提出了基于ZigBee无线通信技术的矿井环境监测系统方案,采用在井下主巷道RS-485有线通信和采掘巷道ZigBee无线通信相结合的网络结构,ZigBee采用网型网络拓扑结构,井上部分上位机和井下监测节点采用标准的Modbus协议进行通信,上位机采用hbview进行数据接收、显示和存储。本文进行了监测节点的硬件设计,编程实现了监测系统ZigBee无线通信和ModbuS协议通信过程。测试结果显示,该系统能够准确可靠显示环境监测信息,证实了该方案可行。     

基于物联网技术的新型数据采集与监控系统设计

文章根据物联网的三种应用架构并结合数据采集与监控系统的体系结构,设计了一种新型数据采集与监控系统方案,该系统将有线通信与无线通信、无线传感网络短距离通信与GPRS／CDMA,3G远距离通信有机地结合起来,提出了监控中心应用软件网络功能的需求、远程数据采集终端现场传感器与终端之间无线组网的方式。该系统与传统的实现方案相比,该方案的通信组网有明显的优势。     

基于无线通信的煤矿井下温度监测系统设计

本文针对现有的煤矿井下温度检测装置与监测系统大都采用有线通信的方式,并且存在现场布线复杂、检修不方便且对电气设备监测能力弱的问题,提出了一种基于有线和无线通信相结合的煤矿井下温度监测系统。该系统主要由温度监测终端、无线信息传输模块、上位机等三大部分组成,解决了现场通信线缆复杂和井下全覆盖监测的问题,实现了对井下温度的安全监测。     

光子辅助的宽带太赫兹通信技术

首先,介绍了光子辅助的宽带太赫兹通信系统中的关键技术.然后,介绍了大容量和长距离太赫兹无线和有线通信技术方面的研究进展.采用这些关键技术,先后实现了太赫兹信号超过1 Tbit/s的无线传输,以及超过100 Gbit/s太赫兹信号在无太赫兹放大器的情况下无线传输54.6 m.最后,介绍了采用空芯光纤进行有线传输超过100...     

宽带无线通信系统的研究与设计

无线通信在军事通信领域一直占有重要地位.新时期军事斗争中,指挥员需要实时地获得现场的视频、语音信息,而传统的无线电台仅仅能够传输数据和话音,已不能满足需要.设计了一种宽带无线通信系统,在研究系统组成和性能指标的基础上,重点研究了补码键控(CCK)调制解调和系统通信协议设计,该系统可用于区域电子系统的超短波数据链,实现战场综合信息的实时传输,也可用于试验训练基地的综合业务数据无线接入和场区各阵地的数据无线传输.     

基于无线传感器网络的远程自动抄表系统设计

针对居民小区抄表系统的技术要求,设计了一种基于无线传感器网络的的远程自动抄表系统方案,该系统将有线通信与无线通信、ZigBee短距离通信与GPRS/CDMA/3G远距离通信有机地结合起来,实现了居民小区的远程自动抄表。给出了组网结构图,阐述了抄表管理中心的软件结构框图和主要功能。与传统的实现方案相比,该方案的通信设计有明显的优势。     

无线光通信的关键技术研究

无线光通信(WirelessOpticalCommunica-tion)结合了光纤通信与无线通信的优点,在解决"最后一公里"接入问题中充分发挥了优势。结合自行研制的系统Agile155对无线通信系统中的几项关键技术进行了分析介绍,并探讨其性能指标和要求及其子系统部件的选择设计。     

无线光通信的关键技术研究

随着高科技的快速发展,无线光通信集无线通信与光通信的各种特点,不断地涌入了我国无线通信工具产业,已成了我国无线通信产业的骨干技术,对人们生活以及国家的无线通信领域带来了极大的便利。本文首先介绍无线光通信技术,探析无线光通信技术的概念和基本原理,其次,探究无线光通信技术的相关应用,再次研究与无线光通信相关的关键技术并探讨数字滤波技术、多接受技术等关键技术的设计以及信道编码技术的介绍,总之,对无线光通信的关键技术进行深入的研究。     

一种低功耗半双工无线话音通信器的实现

介绍了一种针对短距离通信的、半双工、低功耗无线话音通信器的实现方案。从硬件电路和软件设计进行了阐述。给出了射频IC选取中需要注意的事项，详细地论述了无线半双工通信协议的设计过程和整个系统的电源管理。同时对该设计中采用的CVSD语音编码算法作了简要介绍。该设计实现了预期目标。     

无线LED显示系统收发模块的设计

设计了一种无线通信LED显示板的硬件部分．着重介绍了LED点阵显示器的无线收一发模块电路。实践证明该系统便于扩展，工作稳定可靠。     

海上遇险搜救综合通信系统的设计与实现

为了提高我国海上搜救应急反应的调度、指挥能力,利用现代通信、计算机、计算机电信合成(CTI)等技术,实现了海上遇险搜救综合通信系统.该系统采用程控调度交换和无线电台适配的方案,使用无线电台适配器将无线通信转换为有线通信,再通过程控交换机将各级海上搜救中各类卫星、语音电话、视频系统等异构终端综合互联,实现有线通信系统与无线通信系统的无缝连接,从而为值班和搜救指挥人员提供专业、便捷的通信、操作手段,提高指挥判断的准确性和效率.     

Authentication and ID-Based Key Management Protocol in Pervasive Environment

The combination of wired and wireless technologies is spreading rapidly with the advance of Internet and networks, since it enables the creation of new services, and provides new features to both users and service providers. In such wired and wireless integrated services, network integration is very important, because such systems involve linking heterogeneous networks; and they involve integrating transmission technologies across networks. In this situation, existing security and communication technologies are unsuitable, since network integration involves heterogeneous networks. The network may have several security vulnerabilities. Also, the available services are for roaming users. In these services, we must provide fast authentication and security for roaming. Therefore, in this paper we proposed authentication and ID-based key management in pervasive environments. Our system provides efficient, secure communication.     

现代通信技术在油气生产自动化中的应用

介绍了采用现代通信技术构建华北油田采油五厂自动化监控系统的技术方案。针对采油生产现场的多业务需求,分别建设自动化数据采集、话音和视频监控接入系统。同时,根据采油五厂地理位置特点,灵活运用光纤、微波、WLAN等通信技术构成有线/无线混合的三级Ethernet网络,实现多业务综合接入。     

未来中国4G开放移动通信终端和网络接入架构

This paper relates to an advanced open mobile communication system and method of integrating the mobile communications, wireless access systems and wired communications into one common platform architecture for China＇s 4th generation mobile communications, supporting costeffective broadband voice, data and video services in wireless, mobile and wired environment with one single integrated mobile terminal device. The paper includes new architecture in the integrated mobile device and converged network access, and minimum modification in the existing mobile telecommunication infrastructures. This paper introduces the long-term evolution strategy for China＇s TDD system platform towards China＇s future 4G mobile communications.     

Wireless Technology in Industrial Networks

With the success of wireless technologies in consumer electronics, standard wireless technologies are envisioned for the deployment in industrial environments as well. Industrial applications involving mobile subsystems or just the desire to save cabling make wireless technologies attractive. Nevertheless, these applications often have stringent requirements on reliability and timing. In wired environments, timing and reliability are well catered for by fieldbus systems (which are a mature technology designed to enable communication between digital controllers and the sensors and actuators interfacing to a physical process). When wireless links are included, reliability and timing requirements are significantly more difficult to meet, due to the adverse properties of the radio channels. In this paper, we thus discuss some key issues coming up in wireless fieldbus and wireless industrial communication systems: 1) fundamental problems like achieving timely and reliable transmission despite channel errors; 2) the usage of existing wireless technologies for this specific field of applications; and 3) the creation of hybrid systems in which wireless stations are incorporated into existing wired systems.     

Multiple access control protocols for wireless ATM: problemsdefinition and design objectives

The concept of wireless ATM is now being actively considered as a potential framework for next-generation wireless communication networks capable of supporting integrated multimedia services with different QoS requirements. Several key subsystem design issues for wired ATM and wireless networks need to be readdressed in the scope of the wireless ATM. One of the main key subsystem issues is the development of the appropriate medium access control (MAC) protocol, which has the capability to extend the statistical multiplexing of the wired ATM network into the wireless medium. In this article the authors address the problem of a suitable MAC protocol for the specification of a wireless ATM network and outline the design objectives. In addition, the authors address some other challenging key issues that the wireless medium and wireless network architecture impose on the ATM stack protocol     

电力调度无线激光通信系统的研究

分析了无线激光通信在电力调度综合自动化系统中应用的需求与优越性,开发了计算 机仿真与辅助设计系统,研究了变结构编码、变功率发射、备用微波链路等可靠性传输技术,对无线激光通信面向电力行业的组网方案进行了讨论,并提出一种新型多介质宽带通信方式———无线光2电力线通信(OWPLC) 。     

A Framework for Planning a Unified Wired and Wireless ICT Infrastructure

The increase in the use of information and communication technology (ICT) has pushed the existing access networks to their limits. Whole new access networks are currently being deployed and are expected to fully support the already started synergy of services converging on to one network. Through a brief survey of synergy and technology trends, it is concluded that a future network will use wired and wireless as complementary technologies. In this context the paper proposes a framework for planning of unified wired and wireless ICT infrastructures. The framework includes different input parameters of relevance for the planning and implementation, which also include a step-wise implementation plan. Planning methods for wired and wireless planning is presented and a simplified large-scale case study is conducted to verify and illustrate the use of the framework. The framework is concluded to be useful and the discussion lists some areas for further consideration.     

基于GSM的通信枢纽站远控系统的设计

随着通信信息化建设步伐的迈进,对通信管理网络质量提出了更高要求,立足于目前的无线通信枢纽站的网络传输系统现状,阐述了项目开发的研究内容及指标要求,提出了基于GSM的无线通信枢纽站远控系统的方案设计,并进行了可行性分析,及关键技术的实现等。系统利用当前新技术,具有设计和建设低成本、高质量、安全可靠的特点,可以极大地提高通信枢纽的管理效益。     

Single frequency wireless power transfer and full-duplex communication system for intracranial epilepsy monitoring

Current clinical neural recording methods which employ wired connections to the external world can be improved by eliminating the wires thanks to integrated circuit and microsystems technology. This study presents design and implementation of such a system which performs wireless power transfer and data transmission for intracranial epilepsy monitoring. Proposed system provides power to the implant by inductive coupling. Full-duplex communication is also performed at the same frequency as the power transfer. Consequently, a system which can transfer power from 10 mm distance with 30% efficiency has been realized. The system supports 400 kbps uplink communication while downlink communication is performed with 1 kbps at the same time. Design challenges for uplink communication in terms of energy-per-bit and interaction between uplink and downlink communication have been discussed in detail to give an insight about the design trade-offs for a full-duplex communication system superposed on a wireless power transfer link.