基于SOPC的软件无线电资源共享自适应结构

介绍了软件无线电的基本结构，研究了新一代可编程片上系统（system on a programmable chip，SOPC）的特征，提出了基于新一代SOPC的软件无线电资源共享自适应结构，给出了采用这种结构的感知信道衰落、调制方式自适应的软件无线电系统实例，这种结构有望成为软件无线电及感知无线电（cognitive radio）的支柱技术之一。     

软件无线电的产生与应用

本文介绍了软件无线电概念、特点和产生历程，以及软件无线电在移动通信中的应用前景。     

软件无线电技术及其应用前

文章介绍了软件无践电的概念、基本结构、关键技术和目前软件无线电的发展状况，最后阐述了软件无线电的应用前景。特别是在商用移动通信领域的应用前景。     

软件无线电中的数字化解调技术

文章介绍了软件无线电的概念以及数字化调制解调技术在软件无线电中的作用，分析了数字化正交解调方案，提出了一种基于DFT的AM和QDPSK信号数字化解调算法。     

基于软件无线电思想的雷达信号采集系统设计

提出了一种基于软件无线电思想的测速雷达信号采集法。文中分别讨论了用传统方法实现的和基于软件无线电思想实现的变采样频率信号采集系统，着重分析了后者的各个功能模块，并给出了其原理框图。     

基于SOPC技术的软件无线电系统研究

介绍了软件无线电的概念和结构,针对传统软件无线电实现方案,提出一种基于SOPC技术的中频软件无线电解决方案.系统采用基于Nios Ⅱ软核处理器的SOPC技术,在ALTERA公司的FPGA上实现了片上系统.基于SOPC技术的软件无线电系统具有极高的灵活性、可扩展性,这充分体现了软件无线电的设计思想.     

软件无线电中的多主DSP系统结构

本文讨论了现有无线电通信的主要问题。介绍了软件无线电的概念,分析了软件无线电的基本原理,主要特征和体系结构。提出并讨论了能满足软件无线电需求的多主DSP系统结构。     

软件无线电及其在数字电视中的应用

本文阐述了软件无线电的结构和主要关键技术,提出了软件无线电可以用于解决目前数字电视中的多体制问题,并简要地介绍解决方案,指出软件无线电用于数字电视有待研究的课题。     

软件无线电技术研究

目前,软件无线电技术已成为无线电通信领域,特别是军用无线电通信领域的技术热点。文中介绍了软件无线电的概念,分析了其关键技术和难点,给出了两种软件接收机的设计方法,最后讨论了软件无线电的应用问题。     

基于DSP和交换芯片的中频软件无线电接收控制系统设计

软件无线电是无线通信方式之一,为了精准接收中频软件无线电信号,确保中频软件无线电信号接收控制效果,设计了基于DSP和交换芯片的中频软件无线电接收控制系统。加设数字信号处理芯片和交换芯片,通过振荡器、滤波器、混频器等元件的连接,设计无线电接收机,通过调整逻辑控制电路优化接收控制器,生成并执行接收控制指令。在系统硬件的支持下,利用DSP技术采集并处理中频软件无线电信号,校准无线电信号的不平衡程度,通过调制样式识别、解调以及分类存储等步骤,实现系统的接收控制功能。系统测试结果表明,在此次设计系统的控制下,无线电接收信号的平均信噪比高达47.4dB,能够精准接收中频软件无线电信号,具有较好的中频软件无线电信号接收控制效果,有效扩大无线电的接收范围。     

Software defined cloud: Survey,system and evaluation

Next generation cloud systems will require a paradigm shift in how they are constructed and managed. Conventional control and management platforms are facing considerable challenges regarding flexibility, dependability and security that next generation systems must handle. The cloud computing technology has already contributed in alleviating a number of the problems associated with resource allocation, utilization and management. However, many of the elements of a well-designed cloud environment remain “stiff” and hard to modify and adapt in an integrated fashion. This includes the underlying networking topologies, many aspects of the user control over IaaS, PaaS or SaaS layers, construction of XaaS services, provenance and meta-data collection, to mention but few. In many situations the problem may be due to inadequacy of service abstraction. Software Defined Systems (SDSys) is a concept that help abstract the actual hardware at different layers with software components; one classical example of this abstractions are hypervisors. Such abstraction provides an opportunity for system administrators to construct and manage their systems, more easily, through flexible software layers. SDSys is an umbrella for different software defined subsystems including Software Defined Networking (SDN), Software Defined Storage (SDStorage), Software Defined Servers (Virtualization), Software Defined Data Centers (SDDC), Software Defined Security (SDSec) etc. and ultimately Software Defined Clouds (SDCloud). Individual solutions and seamless integration of these different abstractions remains in many respects a challenge. In this paper, the authors introduce Software Defined Cloud (SDCloud), a novel software defined cloud management framework that integrates different software defined cloud components to handle complexities associated with cloud computing systems. The first part of paper presents, for the first time, an extensive state of the art critical review of different components of software defined systems, constructing the proposed SDCloud. The second part of the paper proposes the novel concept of SDCloud, which is implemented and evaluated for its feasibility, flexibility and potential superiority.     

一种用于软件通信体系结构的构件模型

软件通信体系结构(SoftwareCommunicationsArchitecture,简称SCA)已被软件无线电(SoftwareDefinedRadio,简称SDR)论坛采纳为嵌入式系统的标准通信软件结构。SCA提供了一种支持通信软件和硬件可移植、可配置、可扩充和可重用的软件平台,但作为构件框架时仍显不足,主要是缺乏明确的构件模型。在研究CORBA构件模型(CORBAComponentModel,简称CCM)基础上,提出了适用于SCA的轻量级(Lightweight,简称Lw)CORBA构件模型———LwCCM。     

Optimized traffic engineering in Software Defined Wireless Network based IoT (SDWN-IoT): State-of-the-art,research opportunities and challenges

Wireless networks have been in focus since the last few decades due to their indispensable role in the future generation networks like the Internet of Things (IoT). However, the associated challenges in wireless network implementation such as distance, line-of-sight, interference, weather, power issues, etc., affect the performance adversely. Software Defined Networking (SDN) is a future generation networking technology and has been proven to alleviate the performance challenges in the existing wireless IoT networks. It helps to evolve the wireless IoT domain in the form of Software Defined Wireless Network based IoT (SDWN-IoT). Traffic Engineering (TE) has been part of traditional network designs since long back, to improve the performance of the communication networks. However, its more optimized forms and their usefulness in SDWN-IoT networks have been under active investigation. This work explores the existing literature related to the major types of SDWN-IoT networks namely, Software Defined Wireless Sensor Network based IoT (SDWSN-IoT) and Software Defined Wireless Mesh Network based IoT (SDWMN-IoT). Additionally, the article also draws some useful inferences, and compares respective contributions and shortcomings. Finally, various research opportunities and challenges have been discussed with respect to the SDWSN-IoT and SDWMN-IoT networks.     

Protection of centralized SDN control plane from high-rate Packet-In messages

International Journal of Information Security - The logically centralized network control in Software Defined Networks (SDN) facilitates global network vision, flexible and automatic network...     

Discriminate,locate and mitigate DDoS traffic in presence of Flash Crowd in Software Defined Network

The Journal of Supercomputing - Discrimination of Flash crowd and Distributed Denial of Service (DDoS) traffic has been addressed already in legacy network and Software Defined Network (SDN), and...     

An adaptive type-2 fuzzy traffic engineering method for video surveillance systems over software defined networks

Multimedia Tools and Applications - Software Defined Network (SDN) is a new network technology which allows network providers to afford predefined Quality of Service (QoS) for video streaming...     

基于拓扑分割与聚类分析的虚拟软件定义网络映射算法

针对目前大部分基于虚拟软件定义网络（vSDN）的映射算法未充分考虑节点与链路之间的相关性的问题,提出了一种基于网络拓扑分割与聚类分析的vSDN映射算法。首先,通过根据最短跳数进行拓扑分割的方法,降低物理网络的复杂度;然后,通过根据节点拓扑和资源属性进行聚类分析的方法,提升映射算法的请求接受率;最后,通过将链路约束分散到节点带宽资源以及节点的度进行约束考量,对不符合链路要求的节点进行重映射,从而优化了节点与链路映射过程。实验结果表明,该算法有效地提升了基于软件定义网络（SDN）架构的虚拟网络映射算法在较低连通概率物理网络下的请求接受率。     

A novel framework for software defined based secure storage systems

The Software Defined Systems (SDSys) paradigm has been introduced recently as a solution to reduce the overhead in the control and management operations of complex computing systems and to maintain a high level of security and protection. The main concept behind this technology is around isolating the data plane from the control plane. Building a Software Defined System in a real life environment is considered an expensive solution and may have a lot of risks. Thus, there is a need to simulate such systems before the real-life implementation and deployment. In this paper we present a novel experimental framework as a virtualized testbed environment for software defined based secure storage systems. Its also covers some related issues for large scale data storage and sharing such as deduplication. This work builds on the Mininet simulator, where its core components, the host, switch and the controller, are customized to build the proposed experimental simulation framework. The developed emulator, will not only support the development and testing of SD-based secure storage solutions, it will also serve as an experimentation tool for researchers and for benchmarking purposes. The developed simulator/emulator could also be used as an educational tool to train students and novice researchers.     

基于SDS架构的多级DDoS防护机制

随着互联网的高速发展,网络安全的问题越来越严峻。软件定义网络（SDN）的出现为解决网络安全问题提供了全新的解决方案,如软件定义安全（SDS）。在SDS架构的基础上,针对分布式拒绝服务（DDoS）攻击的特点,提出一种新的DDoS防护机制SDS for DDoS。这种防护机制结合了以往检测方式和防护方式的优点,将安全服务原子化,并实现安全策略盒的多级防护策略。在受到DDoS攻击时,机制可以根据检测到的攻击力度进行动态决策,还能先验式地对攻击流量进行阻隔,不仅增加了决策的可信度,还解决了以往所采用的静态防护和后验式防护的不足。实验验证了机制的可行性,能有效地避免服务器受到DDoS攻击,更突出了它在决策时的灵活性和在遭受攻击时的先验性。     

基于计算机网络的下一代软件无线电

1.引言软件无线电(Software Radio,Software Defined Radio)起源于美国国防部的易通话(speakeasy)战术通信系统计划。软件无线电的概念是在1992年全美远程会议上由Joe Mitola等人率先提出的,其定义为:软件无线电基于一个硬件平台,其A/D(模/数)变换应尽量靠近天线,而将尽可能多的无线通信用软件来实现。由此可见,软件无线电代表的是一个软件可重构的无线电体系,它的可重构性主要体现在其射频(RF)、中