DVB-S2载波恢复算法研究

Study on Algorithms of DVB-S2 Carrier Recovery

对DVB-S2的载波恢复算法进行了理论分析和仿真验证,给出利用M&M算法和L&R修正算法相结合实现载频同步,并在不考虑信道编码时,针对16APSK信号进行了载波恢复。得出结论:M&M算法在0dB时仍能够对大频偏进行有效估计,C-4Q-DD算法相位精同步曲线逼近理想同步曲线;验证了为满足线性内插的要求,L&R修正算法至少需要1 000个导频块,FFML线性内插法有3°的固有相差,符合标准的要求。

This paper analyzes and simulates the carrier recovery algorithm of DV B-S2,proposes to combine MM algorithm with LR correction algorithm to achieve frequency synchronization,and realizes 16APSK carrier recovery without considering channel coding.The results indicate that the MM algorithm can estimate a large fr equency offset at 0dB.The curve of fine carrier phase recovery based on C-4QDD algorithm is almost the same as the ideal curve.It is validated that LR correction algorithm needs at least 1000 pilot blocks to meet the de m and of linear interpolation,and FF ML linear interpolation algorithm tends to reach a floor at about 3 degrees,which meets the standard of DVB-S2.