| 一种用于全数字化QPSK解调的大频偏矫正算法 |
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| 引用本文： | 周德锁,田红心,李建军,易克初. 一种用于全数字化QPSK解调的大频偏矫正算法[J]. 电子学报, 2000, 28(7): 55-58 |
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| 作者姓名： | 周德锁 田红心 李建军 易克初 |
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| 作者单位： | 1.西安电子科技大学综合业务网国家重点实验室,西安 710071;2.清华大学电子工程系,北京 100084 |
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| 基金项目： | 国家自然科学基金!(No.69872 0 2 7) |
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| 摘 要： | 在全数字化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.本文提出了一种新的算法,该算法将对频偏的直接估计转换成对一个新序列的周期进行估计,达到对大频偏进行有效估计并矫正的目的,解决了这一难题.此算法计算量较小,统计特性好,已在用单片DSP TMS320C6201实现的多路QPSK信号的数字化解调系统中得到应用.
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| 关 键 词： | 频偏估计 全数字化接收机 QPSK解调 |
| 收稿时间： | 1999-05-24 |
An Algorithm for Rectifying Large Frequency-Offset in Fully Digitized QPSK Demodulation |
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| ZHOU De-suo,TIAN Hong-xin,LI Jian-jun,YI Ke-chu. An Algorithm for Rectifying Large Frequency-Offset in Fully Digitized QPSK Demodulation[J]. Acta Electronica Sinica, 2000, 28(7): 55-58 |
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| Authors: | ZHOU De-suo TIAN Hong-xin LI Jian-jun YI Ke-chu |
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| Affiliation: | 1. National Key Lab.On ISN,Xidian University,Xi'an 710071,China;2. Dept.of Electronic Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | In fully digitized QPSK (Quadrature phase shift Keying) demodulator,sometimes th ere exists a rather large freque ncy-offset so that the demodulator can not work normally.This paper proposes a novel algorithm to solve this challenging problem.Instead of estimating frequenc y-offset directly,we estimate the period of some new sequence,resulting in a go od statistic for frequency-offset estimating.The algorithm is less expensive co mputationally in rectifying frequency-offset,and has been applied to a multi-c hannel QPSK demodulation system,which is implemented with a single DSP(Digital s ignal processing) of TMS320C6201. |
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| Keywords: | frequency-offset estimate fully digitized receiver QPSK demodulation |
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