基于认知无线电的DVB-S2信号接收与解析

doi:10.11896/jsjkx.190700210

摘要/Abstract

摘要： DVB-S2协议作为第二代数字电视卫星广播协议,因具有突出的信号传输性能,在国际上得到了广泛的应用。现有的DVB-S2信号接收多采用标准的商用设备,不便于对信号接收的各个环节进行具体分析。基于此协议,开展了利用认知无线电USRP X310设备和Matlab数字算法实现信号接收解析的研究,同时分析各算法参数对信号接收质量的影响。该研究成果为信号协议进行更深层次的分析和研究以及后续的DVB-S2信号产生、通信对抗等提供可靠的设计指导。为了实现通信系统最大透明化,仅使用认知无线电设备对空间模拟信号进行放大和采样,其余部分全由数字信号处理领域的相关算法完成。文中详细阐述了整个接收平台的硬件设备参数设置和软件系统框架及其内部关键环节的算法实现。关键环节包括符号同步、物理层帧头检测与解析和载波同步等,其中符号同步和载波同步通用于其他通信系统,而物理层帧头检测与解析为针对DVB-S2协议特定设计的环节。最后,以亚洲五号卫星Ku波段上的一个特定节目为例详细说明了DVB-S2信号在接收过程中的处理流程及结果,原始数据传输流最终被正确恢复,该节目视频和音频亦成功播放。

关键词: DVB-S2协议, 认知无线电, 卫星通信

Abstract: DVB-S2 protocol is the second generation of digital television satellite broadcasting protocol,which has been widely used all over the world because of its outstanding signal transmission performance.The existing DVB-S2 signal reception mostly uses standard commercial equipment,which is not convenient for analysis of each module of signal reception.Therefore,this paper carried out the use of cognitive radio USRP X310 equipment and Matlab digital algorithms to realize the reception and analysis final transmission effect which affected by relevant algorithm parameters.This work can provide reliable design guidance for deeper research on signal protocol,subsequent DVB-S2 signal generation and communication countermeasure.Based on DVB-S2 protocol,this paper designed a complete simulation and realization for the reception and analysis system of digital satellite television signals.In order to achieve maximum transparency of the communication protocol,this paper only used cognitive radio equipment to amplify and sample original analog signals,and the rest is completed by digital signal processing algorithms on the software platform.The hardware device to receive and sample DVB-S2 analog signals is a cognitive radio equipment USRP X310 and the software platform for all the digital signal process is MATLAB platform.This paper discussed the details of hardware configuration,digital signal processing framework and theories and implementations of some key modules.The key modules are symbol synchronization,physical layer frame head detection and analysis,and carrier synchronization.In the experimental part,this paper took a specific television program on Ku band of Asian Satellite 5 as an example to illustrate the whole DVB-S2 signal process.Finally,original data transmission stream is obtained and the video and audio of the program can be successfully broadcast.

Key words: Cognitive radio, DVB-S2 protocol, Satellite communication

中图分类号:

TN927

田苗苗, 王祖林, 徐迈. 基于认知无线电的DVB-S2信号接收与解析[J]. 计算机科学, 2020, 47(4): 226-232. https://doi.org/10.11896/jsjkx.190700210

TIAN Miao-miao, WANG Zu-lin, XU Mai. DVB-S2 Signal Receiving and Analysis Based on Cognitive Radio[J]. Computer Science, 2020, 47(4): 226-232. https://doi.org/10.11896/jsjkx.190700210

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