一种基于FPGA的DVB-S2信号解调方法与实现  

Method and Implementation of DVB-S2 Demodulation Technology Based on FPGA

作　　者：王占文 汤新广[2] 韩星[2] WANG Zhanwen;TANG Xinguang;HAN Xing(Chengde Service Center for Promoting Sustainable Development Hebei,Chengde 067000,China;The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]承德市可持续发展促进服务中心,河北承德067000 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2021年第3期333-337,共5页Radio Communications Technology

基　　金：国家部委基金资助项目。

摘　　要：DVB-S2信号接收目前多采用商用芯片接收方案,但其存在使用不够灵活、中间处理结果无法选择输出等问题。针对需要实时获取解调数据、TS/GS码流及同步数据等中间数据的特殊需求,提出一种采用FPGA实现解调、译码及多种数据码流选择输出的处理方法,采用基于SOF+PLSC差分相关以及能量自适应门限方法实现帧头搜索同步,以及采用基于精简星座图的直接判决鉴相算法实现高阶调制信号载波相位同步解调。基于单块FPGA信号处理板完成功能和性能验证,中间解调、译码等处理结果可以选择输出。该方法性能可靠、工作稳定、接口丰富、功能升级方便,可以广泛应用于具有特殊需求的卫星信号侦察接收场合。Currently,DVB-S2 receivers mostly use commercial chip solutions.But it has problems such as insufficient flexibility in use.For the special needs of real-time acquisition of demodulated data,TS/GS code stream,synchronization data and other data,a processing scheme is designed that uses FPGA demodulation,decoding and multiple data stream selection and output.The scheme adopts frame head search and synchronization technology based on SOF+PLSC and carrier phase synchronization technology based on multiple modulation styles.Finally,the function and performance of a signal processing board base on FPGA is verified,and the receiving performance meets the design requirement.The scheme provides advantages of stable operation,rich interface and easy software upgrade,which can be widely used in various satellite signal receivers.

关 键 词：DVB-S2 帧头搜索及同步 载波相位同步 FPGA实现 

分 类 号：TN911[电子电信—通信与信息系统]