一种低复杂度的DVB-T定时同步方法

提出了一种低复杂度的定时同步方法,采用基于循环前缀的最大似然联合估计算法完成符号粗同步;采用估算同一符号的导频点数据相位差的算法完成符号细同步;采用估算相邻符号的导频点数据相位差的算法完成采样频偏同步.仿真结果表明,在DVB-T给定的多径衰落信道条件下,整个定时同步环路能准确定时,最大能纠正相对误差为330×10-6的采样频偏.较传统的Wallace Tree方法实现符号粗同步,降低了53.2%的硬件复杂度,整个定时同步环路节省了约26%的逻辑电路资源.

A Timing Synchronization Method of Low Complexity for DVB-T System

A timing synchronization method of low complexity is presented.It makes use of joint maximum likelihood estimation based on the cyclic prefix to finish coarse timing synchronization.It fulfills fine symbol synchronization by detecting the phase difference between two adjacent pilots of one symbol.It completes sampling frequency synchronization by detecting the phase difference between two pilots of two successive symbols.Simulation of the system shows that the whole timing synchronization loop meets the requirement of idea reception,even for execrable multipath channel of DVB-T.Compared with the traditional Wallace Tree implementation,the hardware cost of the proposed scheme is decreased by 53.2%,while the total area of logic circuits is decreased by 26%.