Research on Timing Synchronization Algorithm of Higher-Order 64-APSK Signals Based on DVB-S2X Standard

Abstract

64-APSK modulation is added in the new generation standard of DVB-S2X, the higher order factor causes the signal to be more seriously affected by the clock frequency difference of the transceiver system, and the requirement of synchronization algorithm is more strict. This paper explores timing synchronization algorithms for high-order 64-APSK signals. First, the applicability of two commonly used timing synchronization algorithms for higher order 64-APSK signals, the Gardner algorithm of feedback structure and forward structure algorithm based on the digital square ring are studied in this paper. And then, through the analysis of these two algorithms with the characteristics of higher-order APSK signals, an improved idea of eliminating high-order influence in timing synchronization algorithm is obtained.