【摘要】 在"第三次技术革命"的浪潮下,人们对4K甚至8K超高清电视、互动电视等富媒体展示出更高的热衷度。新一代数字卫星传输技术DVB-S2X提供了更多适用场景。为解决极低信噪比场景下DVB-S2X卫星通信信息接收系统定时存在抖动,难以满足终端小型化趋势。针对DVBS2X接收系统定时同步展开研究,利用LDPC编码的内联特性,基于M值编码辅助算法,提出了一种改进的基于三角插值的码辅助算法。仿真结果显示,该算法可以进一步提升接收系统同步性能,且复杂度得到优化。更多还原

【Abstract】 Driven by the third wave of technical revolution, people show a higher enthusiasm for rich media such as 4K or even 8K ultra-high definition television, interactive TV and so on. The new-generation digital satellite transmission technology DVB-S2X provides more applicable scenarios. For the timing jitter of DVB-S2X satellite communication information receiving system in very low SNR scenario, it is difficult to meet the trend of terminal miniaturization. So the timing synchronization of DVB-S2X receiver system is explored. By using the inline characteristic of LDPC coding, and based on M-valued code-aided algorithm,a modified algorithm based on trigonometric interpolation is proposed. The simulation results indicate that the proposed algorithm can further improve the synchronization performance of the receiver system, and the complexity is optimized.更多还原