Joint time-domain correlation and code-aided carrier synchronization algorithm

2013 IEEE International Conference on Signal Processing, Communication and Computing (ICSPCC 2013) Pub Date : 2013-11-14 DOI:10.1109/ICSPCC.2013.6663921

Jinhua Sun, Xuemei Wang, Xiaojun Wu

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引用次数: 2

Abstract

Considering low estimation accuracy and small synchronization range of carrier synchronization algorithms in low signal-to-noise ratio (SNR) for short burst communication systems, a joint time-domain correlation and code-aided carrier synchronization algorithm is proposed. Firstly, a frame structure in which the pilot symbols are separated with data symbols is used. Then, a new frequency estimation method using the summation of the entire cross correlation is deduced based on the time-domain correlation frequency estimation criterion. Based on this, the summation of the cross correlation of the pilot symbols after removing modulation is utilized to perform coarse synchronization and of the pilot symbols and decoding soft information is utilized to perform fine synchronization. So a joint time-domain correlation and code-aided carrier synchronization algorithm is obtained. Simulations by the Turbo code verify that the proposed algorithm can obtain higher estimation accuracy with only 32 QPSK pilot symbols, and the SNR degradation of Turbo decoder is within 0.5dB when the normalized frequency offset is smaller than 1.5×10-3.

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联合时域相关和编码辅助载波同步算法

针对短突发通信系统低信噪比条件下载波同步算法估计精度低、同步范围小的问题，提出了一种时域相关和编码辅助载波同步联合算法。首先，采用导频符号与数据符号分离的帧结构。然后，在时域相关频率估计准则的基础上，推导了一种利用全互相关和的新频率估计方法。在此基础上，利用导频符号去调制后的互相关之和进行粗同步，利用导频符号与译码软信息的互相关之和进行精同步。给出了一种时域相关和码辅助载波同步的联合算法。Turbo码仿真验证了该算法仅使用32个QPSK导频符号即可获得较高的估计精度，当归一化频偏小于1.5×10-3时，Turbo译码器的信噪比下降在0.5dB以内。

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2013 IEEE International Conference on Signal Processing, Communication and Computing (ICSPCC 2013)

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