双帧长同步判决的数据复接方法

针对高误码率、存在滑码的恶劣无线数字传输链路,本文提出一种基于最大后验概率(MAP)的双帧长同步判决算法。该算法根据信道实时反馈的误码率和滑码率,利用特定应用中滑码长度的先验概率特性以及前后帧的相关性进行帧同步判决;并结合一种帧同步的快速判决方法以提高算法效率。本文算法相对于传统的帧同步搜索取得了明显的性能改善,提高了帧同步判决的可靠度及进行音视频同传的传输效率,在实际应用中取得了很好的效果。

Multiplex Scheme of Dual-Frame length Synchronization Algorithm

To enhance the transmission efficiency of digital communication links suffering high bit error rate and high slip rate, this paper proposes an MAP (Maximum A Posteriori) based dual- frame length synchronization algorithm, wherein the a priori knowledge of slipping and channel errors,as well as the correlation of adjacent synchronization codes are efficiently exploited to make the deci- sion of synchronization; combined with an algorithm of quick synchronization judgement,it enhances the reliability of synchronization and the transmission efficiency of the combination of video and audio.This method has been implemented in shortwave communication, and gets good gains.