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TDMA信号的宽范围载波同步译码联合迭代处理
侯骁宇,李天昀,杨司韩
0
(战略支援部队信息工程大学 信息系统工程学院,郑州 450002)
摘要:
针对时分多址(Time Division Multiple Access,TDMA)信号提出了宽范围的载波同步译码联合迭代处理的方案。该方案主要分为三个部分,首先利用TDMA信号的同步码进行数据辅助同步,对信号中的大频偏和相偏进行粗估计和纠正;然后利用线性调频Z变换(Chirp-Z Transform,CZT)算法针对整突发帧进行非数据辅助同步,精确估计和纠正信号的剩余频偏;最后通过利用译码器输出的软信息进行编码辅助同步,多次迭代得到剩余相偏的精确估计,最终实现载波的精确同步并输出译码结果。实验结果表明,所提方案具有同步捕获范围宽、参数估计精度高、译码输出误比特率低等优点,在低信噪比环境下也能表现出优良性能。
关键词:  时分多址  载波同步  联合迭代  编码辅助同步
DOI:
基金项目:国家自然科学基金资助项目(U1736107)
Wide range carrier synchronization decoding joint iterative processing for TDMA signals
HOU Xiaoyu,LI Tianyun,YANG Sihan
(Institute Information System Engineering,Strategic Support Force Information Engineering University,Zhengzhou 450002,China)
Abstract:
A wide range carrier synchronization decoding scheme is proposed for time division multiple access(TDMA) signals.The scheme is divided into three parts.First,the synchronization code of TDMA signal is used to carry out data-aided(DA) synchronization.The large frequency offset and phase deviation in the signal are roughly estimated and corrected.Then the Chirp-Z transform(CZT) algorithm is used to carry out non-data-aided(NDA) synchronization for the whole burst frames.The residual frequency offset of the signal is estimated and corrected.Finally,the code-aided(CA) synchronization is carried out by using the soft information of the decoder output,and the accurate estimation of the residual phase deviation is obtained by multiple iterations.Eventually,the accurate synchronization of the carrier is realized and the decoding results are output.The experimental results show that the proposed scheme has a wide range of synchronization acquisition,high precision of parameter estimation,low bit error rate of decoding output and good performance in low signal-to-noise ratio(SNR) environment.
Key words:  TDMA  carrier synchronization  joint iteration  code-aided synchronization
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