摘要
为了解决数字电视地面广播中信号同步的难题,提出了一种新的正交频分复用的定时同步算法,该算法针对最新出台的中国数字电视地面广播传输系统国家标准的帧结构构思定制。它能根据国标中信号帧前缀PN头的良好自相关特性,无需本地PN序列而直接进行帧同步,基于最大似然估计并加以改进,在此基础上再利用其双向循环前后缀的特性进行频偏校正,效果良好。
In order to solve the problem of signal synchronization in digital TV terrestrial broadcasting , aiming at the frame structure of the newly released Chinese DTV terrestrial broadcasting national standard, this paper proposes a new synchronization algorithm based on OFDM system. Because of the good performance of the autocorrelation characteristic of the signal PN frame head, this algorithm does not use the local PN sequence and synchronizes directly. This algorithm bases on the ML estimation and improves it. More, it utilizes the characteristics of its bidirectional cyclic prefix to perform frequency offset correction. The result is good.
出处
《电子器件》
CAS
2008年第6期1739-1742,共4页
Chinese Journal of Electron Devices
基金
国家自然科学基金资助(60472058)
教育部博士点基金资助(20050286001)
教育部"新世纪优秀人才支持计划"的资助
关键词
无线通信
同步
OFDM(正交频分复用)
频偏
wireless communication
synchronization
OFDM （ Orthogonal Frequency Division Multiple- xing）
frequency offset
