论文部分内容阅读
针对在动态多径信道条件下残余频偏波动较大、难以获得高估计精度及大估计范围的问题,提出一种应用于数字电视地面多媒体广播(DTMB)系统频偏估计的改进算法.根据DTMB标准中相位旋转的初始相位规律,尽可能使参与相关运算的2段伪噪声序列数据一样,从而使系统可较容易地选出多条径参与偏频的计算,达到频偏估计的多径合成效果.多径信道下的仿真结果证明:该算法提高了动态载波恢复模块的工作稳定性,延长了系统锁定时间,系统残余频偏绕中心±10Hz以内波动,改善了系统频偏估计性能.
Aiming at the problem that the residual frequency offset fluctuates greatly under dynamic multipath channel condition and it is difficult to obtain the high estimation accuracy and large estimation range, an improved algorithm is proposed for frequency offset estimation of digital television terrestrial multimedia broadcasting (DTMB) system. According to DTMB Standard phase rotation of the initial phase law, as far as possible to participate in the relevant operations of the 2 pseudo-noise sequence data, so that the system can be more easily selected multiple paths involved in the calculation of frequency offset to achieve frequency offset estimation of multipath synthesis The simulation results under multipath channel show that this algorithm improves the stability of the dynamic carrier recovery module, prolongs the system lock time and the system residual frequency fluctuation fluctuates within ± 10Hz around the center, which improves the system frequency offset estimation performance.