TBCC译码辅助的短数据块盲帧同步技术

Blind Frame Synchronization Assisted by Decoding of TBCC Based on Soft Decision

咬尾卷积码(Tail-biting Convolutional Codes,TBCC)消除传统归零卷积码带来的码率损失,在短数据块编码时具有较明显的性能优势。本文结合TBCC译码,从降低同步开销,提高短数据块传输效率角度,提出一种适用于TBCC译码辅助盲帧同步方案。该方案利用TBCC校验矩阵约束构造节点矩阵,然后累加每个比特的真实度量作为同步度量准则,并在识别出正确同步位置的同时完成译码。仿真结果表明,对于短数据块盲同步,基于软判决的计算真实度量方案相比硬判决有明显的性能优势,在高信噪比下接近理想同步的性能。

Tail-biting convolutional codes(TBCC)eliminates the bit rate loss caused by traditional zero-tail convolutional codes,and has obvious performance advantages in short data block encoding.Combining with TBCC decoding,this paper proposes a blind frame synchronization scheme which is suitable for TBCC decoding to reduce the synchronization cost and improve the transmission efficiency of short data blocks.In this scheme,the node matrix is constructed by TBCC check matrix constraint,and then the real measure of each bit is accumulated as the synchronization measure criterion,and the correct synchronization position is identified while the decoding is completed.The simulation results show that for short data block blind synchronization,the scheme based on soft decision to calculate the real measurement has obvious performance advantages compared with hard decision,and is close to the performance of ideal synchronization under high SNR.