多模噪声理论及其在通信保密中的应用

给出了一种比较通用的非高斯噪声模型——多模噪声,采用无惯性非线性变换器给出了多模噪声中信号的检测与估计方法,该方法对概率密度函数形状对称的噪声是普遍适用的。在此基础上设计了可用于通信保密的多模噪声,说明了本加密方法适用于无线通信信道加密,并从统计分析的角度研究了可能的密码分析方法。     

未来电磁频谱管理对信息通信技术的需求分析

无线电通信的高速发展,使频谱使用越来越广泛,频谱资源日益紧张,为使有限的频谱资源发挥更大的价值,一方面依赖于无线通信技术的进步,开发出频谱利用率更高的应用系统,另一方面要加强频谱的科学管理,将行政管理和科学技术紧密结合。信息通信技术在过去的50年中发展迅速,大量研究证实信息通信技术在管理创新和决策活动中的作用非常明显。文章针对电磁频谱管理技术手段的发展,对信息通信技术的需求做相关分析。     

Bacterial communication systems: A mathematical formulation of negative chemotaxis

The emergence of molecular communication (MC) has provided a new paradigm for communication at nanoscale, besides the electromagnetic one. Numerous biological systems have been proposed that could be used for communication, using mostly bacteria as information carriers, ensuring biocompatibility and low complexity requirements. In this work, message dissemination dynamics in a bacterial communication system was under investigation by means of a simulation framework that was designed and developed based on a commercial tool. A mathematical formulation is proposed, in an effort to accurately predict the system's behavior under the presence of chemotactic‐like nodes. Simulation results are in strong agreement with the respective mathematical model, for a wide range of biological processes, including phenomena such as chemotaxis, bacterial growth cycle, and biological message transformation dynamics. In the case of a simple simulation scenario exhibiting chemotaxis, the mean accuracy improvement reaches values of up to 19% .     

Mitigating adjacent channel interference in vehicular communication systems

In the last few decades, dedicated wireless channels were specifically allocated to enable the development and implementation of vehicular communication systems. The two main protocol stacks, the WAVE standards proposed by the IEEE in the United States and the ETSI ITS-G5 in Europe, reserved 10 MHz wide channels in the 5.9 GHz spectrum band. Despite the exclusive use of these frequencies for vehicular communication purposes, there are still cross channel interference problems that have been widely reported in the literature. In order to mitigate these issues, this paper presents the design of a two-stage FIR low-pass filter, targeting the integration with a digital baseband receiver chain of a custom vehicular communications platform. The filter was tested, evaluated and optimized, with the simulation results proving the effectiveness of the proposed method and the low delay introduced in the overall operation of the receiver chain.     

Optical Communications Research Activities at COM RD1 Siemens S.A.

Abstract

This article summarizes the research activities carried out by the R&D Optical Networks Communications group (COM RD1), at Siemens S.A., in collaboration with both universities and other research institutes. These activities cover various aspects of advanced modulation formats, all optical wavelength conversion, optical quality of signal monitoring in transparent WDM networks, routing, and wavelength assignment in optical networks.     

60 GHz无线通信技术发展现状及趋势研究

60 GHz无线通信技术以其丰富的频谱资源和高速的数据传输速率,成为目前无线通信领域的研究热点之一。首先介绍了60 GHz无线通信技术的概念内涵、特点优势和应用场景;接着重点阐述了60 GHz无线通信技术形成的产业联盟和通信标准;然后分析了60 GHz无线通信技术发展面临的问题;最后根据信息技术的发展形势,展望了60 GHz无线通信技术的发展趋势。     

高动态临近空间飞行器海上组网测控方案设计

为解决高动态临近空间飞行器海上测控对测量船数量需求较多、现有船队规模无法满足的难题,在分析测控需求特点的基础上,提出了一种基于测量船与临近空间飞艇组网测控的新模式。结合近中程、远程飞行试验分别进行了测控总体方案设计,并讨论了海上组网测控需要研究的关键技术。相关研究对我国后续开展高动态临近空间飞行器海上测控系统建设具有一定的参考价值。     

融合通信业务与OTT业务互通的研究与实践

移动互联网大发展的背景下融合通信面向手机用户提供增强型的基础通信服务,对话音、消息和通讯录等基础通信业务进行升级,通过分析研究融合通信与即时通信(IM)为代表的OTT业务互通,找到一种融合通信与OTT业务消息互通、协调发展的模式。     

高速铁路场景移动通信系统切换研究综述

高铁的高速、全封闭特性给移动通信系统的越区切换性能带来了极大挑战,直接影响用户体验。阐述了移动通信系统中越区切换的概念,并指出高速铁路场景下越区切换面临的问题。回顾了国内外为解决这些问题所进行的相关研究及最新进展,包括网络架构优化和切换流程中测量、参数设置、执行策略、数据传输环节的优化,并指出群切换机制是未来值得关注的研究方向。     

平流层通信新思路——谷歌气球计划

平流层通信具有低延迟、信道衰落小、造价低廉、机动灵活等特点,在军事应用和应急通信领域都有重要的战略价值,也曾经引起各国的重视,并成为研究热点。然而平流层通信平台的稳定性对各国研究者而言一直是一个挑战,谷歌公司从鸟群飞行中得到启发,开启了Google Loon项目,其目的是为全球偏远地区2/3人口提供速度较快、价格可承受的互联网接入服务,同时为自然灾害发生地区提供通信服务。文中分析了谷歌气球的技术细节,谷歌气球初次试验的情况,以及谷歌气球面临的挑战。谷歌气球计划为平流层通信提供了又一新思路。