| 一种QPSK信号数字解调大频偏载波恢复算法 |
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| 引用本文： | 尚耀波,郭英,龚成.一种QPSK信号数字解调大频偏载波恢复算法[J].通信技术,2008,41(12). |
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| 作者姓名： | 尚耀波 郭英 龚成 |
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| 作者单位： | 空军工程大学,电讯工程学院,陕西,西安,710077 |
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| 摘 要： | 在全数字QPSK解调器中,有时存在着相当大的相对载波频偏,导致接收机不能正常工作.针对QPSK信号相干解调中载波同步问题,提出一种采用FFT及锁相环联合提取大频偏信号载波的方法,达到了对大频偏进行有效估计并提取较纯载波的目的.该方法统计性能好,结构简单,可估计的载波频率适应范围大,算法适合数字电路实现.
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| 关 键 词： | 锁相环 载波估计 四相相移键控 快速傅里叶变换 |
An Algorithm for Carrier Synchronization in Large Frequency Offset in Digitized QPSK Demodulation |
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| SHANG Yao-bo,GUO Ying,GONG Cheng.An Algorithm for Carrier Synchronization in Large Frequency Offset in Digitized QPSK Demodulation[J].Communications Technology,2008,41(12). |
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| Authors: | SHANG Yao-bo GUO Ying GONG Cheng |
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| Abstract: | In fully digitized QPSK demodulator,sometimes there exists a rather large frequency offset so that the demodulator can not work normally.A new algorithm for a large frequency offset estimating QPSK transmission based on FFT associate with phase lock loop is proposed,which has reached a good statistic and a big range for frequency offset estimating.This is suitable for the implementation of digital hardware. |
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| Keywords: | phase-lock loop carrier estimation QPSK FFT |
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