海底光缆技术发展研究

海底光缆作为洲际之间、岛屿与大陆之间、岛屿与岛屿间通信传输的纽带,以其大容量、高可靠性、低损耗、抗电磁干扰能力强、保密性好等特点,在国际通信和国防通信中起着极其重要的作用,而新技术和新材料的发展也为海底光缆的发展提供了极佳的平台。简要概述了海底光缆技术发展情况及国内外海底光缆概况,介绍了我国海底光缆的技术要求和结构特点,并指出其技术发展趋势。     

海底光缆安全研究

海底光缆通信具有大容量、通信质量稳定可靠,隐蔽性好,抗毁、抗干扰能力强等特点,成为现代洲际通信的主力.从介绍海底光缆通信系统的组成入手,分析了影响海底光缆传输线路安全和光缆所传输信息安全的主要因素,提出了光缆质量与施工、故障定位与排除和加强信息传输安全等防护措施.     

飞速发展的无中继海底光缆通信技术

本文介绍了海底光缆通信技术飞速发展的原因,着重论述无中继海底光缆通信系统的构成和相关技术的发展,同时对系统设计、光缆敷设、验收测试、维修中要注意的问题也进行了说明。     

层绞式海底光缆的结构优势

海底光缆通信是当今世界洲际通信的主力.与中心管式海底光缆相比,层绞式海底光缆由于缆芯结构的不同,它的光纤余长控制简单、准确、有效;能容纳更多的光纤芯数,通信容量更大;具有更好的温度性能和机械性能.在当今信息时代对通信容量的需求越来越大的背景下,层绞式海底光缆具有很大的理论研究价值和实际应用价值.     

高速发展的海底光缆通信

世界海底光缆通信线路在1988年以后发展十分迅速，这对于建设全球数字通信网将起到重要作用。本文除概述世界海底光缆线路建设现状和今后发展计划之外，还浅谈海底光缆在国际通信中的作用。最后指出海底光缆通信技术发展动向。     

海缆市场曙光重现国内企业竞相发力

近年来,随着宽带业务和互联网的飞速发展,作为国际通信最重要的传输手段,海底光缆系统,特别是国际海底光缆系统正发挥着越来越重要的作用.在全球范围内,海缆行业逐渐摆脱困境,宽带业务和互联网用户数的快速增长刺激了海缆市场的繁荣.在国内,一批传统光纤光缆企业也开始积极研发相关海底光缆技术,向国际市场进军.     

海底光缆通信技术

结合设计实例，介绍了第三代海底光通信的最新技术，为海底光缆通信系统工程设计提供了思路。最后，探讨了海底光缆通信的发展趋势。     

海底光缆通信标准及诠释

本文简要介绍了海底光缆通信标准的制修定情况,其次对制定海底光缆产品标准的背景、必要性及有关的技术内容进行了论述。 海底光缆以其容量大、可靠性高及传输质量优良等特点,在光通信领域中日益显示其特殊的重要性和现实意义。随着光通信技术的不断进步,借助于相应的国际标准化蓬勃发展的势头,我国海底光缆通信系列标准的发布和制定已有了长足的进步,并在逐渐完善。众所周知,标准是以科学、技术和社会实践的综合成果为基础     

海底通信光缆水下设备供电系统设计

海底通信光缆是国际通信流量的主要载体,国际互联网带宽加速增长推动了海底通信光缆的加速建设。介绍了海底通信光缆水下设备供电系统基本结构,分析了海底光中继器、海底分支单元和远供电源设备等器件的工作原理及内部电路设计,提出了海底通信光缆水下设备供电系统设计方法,并结合案例分析供电系统的切换保护机制。     

海底光缆通信技术的现状和发展趋势

介绍了海底光缆的传输技术，网络互联技术和敷设／维护技术等，并就海底光缆通信技术的现状和发展趋势提出参考意见。     

对我国通信技术创新发展的思考

经过多年努力,我国通信业取得长足发展,在大多数领域已具备了生产世界先进产品的能力,部分企业拥有了较强的技术研发能力。但与世界先进水平相比,仍存在一定差距,技术创新势在必行。对各国通信技术发展与创新历程进行了总结,初步提出我国通信技术创新体系框架,以及技术创新过程中应把握的几个关键点。     

1999年中国蜂窝移动通信及手机市场走向分析

中国移动电话数已跃居世界第三位，增长速度在部分城市妆近或开始超过普通固定电话。而在设备市场上，中国开发的ＧＳＭ产品正在取得突破性进展，开始了国外产品的角逐，手机市场尤其如此。此外，中国移动通信标准的选择正处于关键时刻，可能影响到第三代移动通信技术的选用。     

广义多载波合成滤波器组的快速算法

近年来,移动通信业务在全球范围内发展迅猛。除了通话短信等服务外,人们要求更多的多媒体服务,能满足无所不在的各种个性化的需求。即将推出的3G系统也不能满足未来用户的实际需求,国内外移动通信领域的专家已经在进行B3G/4G系统的研究和开发工作。推导了广义多载波合成滤波器组的快速实现算法,并且结合Xilinx公司Virtex-Ⅱ系列芯片的结构特点,设计出了广义多载波合成滤波器组的FPGA实现结构。     

未来移动通信系统展望和我国的发展战略

综述了未来移动通信系统的发展趋势及其在技术上所面临的桃战，在分析国内外移动通信发展现状的基础上，指出了我国移动通信领域的发展战略。未来移动通信系统更高量级数据速率的要求、数据速率的大动态变化范围、IP地址的个人化和有限的频谱资源等诸多方面的特点，要求系统有更加先进的网络、更加灵活高效的空中接口和移动终端等。世界各国已经开始了4G的研制工作。我国应该抓体时机，及时开始4G关键技术的研究，在不断发展科研力量和输出知识产权的基础上，要充分利用各种有利因素，扩大我国在移动通信领域的国际影响，以推动我国未来移动通信事业的发展。     

Machine Learning and Deep Learning powered satellite communications: Enabling technologies,applications, open challenges,and future research directions

The recent wave of creating an interconnected world through satellites has renewed interest in satellite communications. Private and government-funded space agencies are making advancements in the creation of satellite constellations, and the introduction of 5G has brought a new focus to a fully connected world. Satellites are the proposed solutions for establishing high throughput and low latency links to remote, hard-to-reach areas. This has caused the injection of many satellites in Earth's orbit, which has caused many discrepancies. There is a need to establish highly adaptive and flexible satellite systems to overcome this. Machine Learning (ML) and Deep Learning (DL) have gained much popularity when it comes to communication systems. This review extensively provides insight into ML and DL's utilization in satellite communications. This review covers how satellite communication subsystems and other satellite system applications can be implemented through Artificial Intelligence (AI) and the ongoing open challenges and future directions.     

空时编码研究进展综述

空时编码是近年来发展很快的无线通信新技术,MIMO与空时编码结合的技术具有通信容量高,克服多径效应好等特点,在无线通信领域获得广泛应用。综述空时编码研究已取得的重要研究成果及其应用现状,介绍了集中式和分布式MIMO模型,分析比较了典型空时码的结构特点、主要特性和应用场合,指出其有待进一步研究解决的问题,分析了空时编码研究的发展方向。     

ATM knits voice, data on any net

The hottest topic in the communications industry is asynchronous transfer mode, or ATM. After hiding out for several years in standards committees around the world, the technology is grabbing headlines in every periodical in the field; the reason is that ATM is the first technology to merge voice and data communications into a common format that is equally and equitably inefficient for both. Here, the author presents an overview of ATM technology and applications     

Introduction to "Synchronous Communications"

The paper "Synchronous Communications," originally published in this journal in December 1956 by John P. Costas, has had a profound effect on modem digital communications. At the time of its publication, virtually all communications were analog in nature and, in fact, the stated goal of the paper was to demonstrate an amplitude-modulated (AM) system that could provide significantly improved performance for analog signaling and to dispel the notion that single sideband (SSB) had inherent performance advantages over properly constructed AM signaling systems. This paper is particularly significant because it was the first to demonstrate that carrier phase could be reliably recovered from the received signal using a structure that has come to be known as the Costas Loop.     

Tropospheric scatter communications Past, present, and future

In the 11 years since the first practicable operational tropo systems were developed, there has been a tremendous growth in their number and complexity. This article describes the principles and applications of tropospheric scatter communications and discusses current development trends. Included is a table listing practically all of the tropo systems installed around the world, with pertinent technical data, together with maps showing the geographic location of most systems. The maps are keyed to the table for easy reference.     

Radiowave propagation research in the tropics using a transportablemultiparameter radar system

Although accurate models for Earth-space microwave propagation, based on extensive measured data, exist for temperate regions of the world, this is not the case for the tropics. With the proliferation of satellite communications in these areas, it has become important to test the validity of currently recommended techniques for calculating circuit availability and co-channel interference levels due to attenuation by precipitation and scattering from precipitation, respectively. Multiparameter radar measurements, employing both polarimetric and Doppler techniques and made over a significant period of time on a statistically-valid basis, provide an ideal tool for these investigations. The paper describes the design considerations for, and construction of such a radar. A selection of its data products are presented, illustrating its potential for radio propagation and meteorological research