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针对高误码率、高滑码率的恶劣无线数字传输链路,为了提高帧同步判决的可靠度并从而提高系统传输效率,该文提出了一种基于最大后验概率(MAP)的定长帧同步判决算法。该算法能够根据信道实时反馈的误码率和滑码率,并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。这种算法相比传统的帧同步搜索性能有明显的改善,在误码率为5×10-2且滑码率为1×10-8时,误同步率仍然低于5×10-5。该同步算法还具有可扩展性,可以方便地扩展到变长帧的同步判决、变长包的解复接等多种应用场合。
In order to improve the reliability of the frame synchronization decision and improve the transmission efficiency of the system, aiming at the bad wireless digital transmission link with high bit error rate and high coding rate, this paper proposes a scheme based on maximum a posteriori probability (MAP) Frame synchronization decision algorithm. This algorithm can make the frame synchronization decision based on the bit error rate and the sliding rate of the real-time feedback of the channel, and using the prior probability of the sliding length in a specific application and the correlation of the previous and the latter frames. Compared with the traditional frame synchronization search performance, this algorithm has obvious improvement. When the bit error rate is 5 × 10-2 and the code rate is 1 × 10-8, the error synchronization rate is still below 5 × 10-5. The synchronization algorithm also has the scalability, which can be easily extended to the variable length frame synchronization decision, variable length packet de-multiplexing and other applications.