| 摘要: |
| 针对卫星通信第二代卫星数字电视广播（Digital Video Broadcasting-Satellite 2,DVB-S2）系统中可变的编码调制方式和物理层帧长，以及接收机需要工作在低至-2 dB的信噪比条件的要求，提出了一种基于DVB-S2帧头结构的最优相关间隔相关检测和双阈值峰值检测帧同步方法，并采用状态机控制PLS（Physical Layer Signaling）码解码，通过解出帧头信息快速跟踪下一帧头位置。仿真结果表明，该方法性能明显优于传统的SOF+PLSC（Start of Frame and Physical Layer Signaling Code）算法，并且能够适用于低信噪比条件和可变的编码调制方式。 |
| 关键词: 卫星通信 DVB-S2系统 可变编码调制 帧同步 相关检测 峰值检测 |
| DOI： |
|
| 基金项目: |
|
| An optimal correlation interval frame synchronization method for DVB-S2 system |
| ZHANG Ying,YAO Chen,WANG Zhugang,LI Jionghui,XIONG Weiming |
| (1.National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;2.University of Chinese Academy of Sciences,Beijing 100049,China) |
| Abstract: |
| For variable encoding and modulation method and variable length of physical frame in satellite communication digital video broadcasting-satellite 2(DVB-S2) system,as well as required condition that receiver needs to work in as low as -2 dB signal-to-noise ratio(SNR) condition,a frame synchronization method with an optimal interval-correlation detection based on the structure of the DVB-S2 frame header and a double threshold peak detection is proposed.The state machine is adopted to decode physical layer signaling(PLS) code,and the position of the next frame header can be quickly tracked through obtaining the frame header information.The simulation shows that the performance of this method is superior to that of the traditional start of frame and physical layer signaling code(SOF+PLSC) algorithm,and it is suitable for low SNR and variable encoding and modulation mode. |
| Key words: satellite communication DVB-S2 system variable encoding and modulation frame synchronization correlation detection peak detection |
《电讯技术》编辑部 