一种新的基于小波变换的QPSK信号解调方法

doi:10.16088/j.issn.1001-6600.2016.02.006

广西师范大学学报（自然科学版） ›› 2016, Vol. 34 ›› Issue (2): 35-45.doi: 10.16088/j.issn.1001-6600.2016.02.006

一种新的基于小波变换的QPSK信号解调方法

陈锦, 罗晓曙

广西师范大学电子工程学院,广西桂林541004

收稿日期:2015-12-10 出版日期:2016-06-25 发布日期:2018-09-14
通讯作者: 罗晓曙(1961—),男,湖北应城人,广西师范大学教授,博士。E-mail:lxs@mailbox.gxnu.edu.cn
基金资助:
国家自然科学基金资助项目(11262004)

A Novel QPSK Signal Demodulation Method Based on Wavelet Transform

CHEN Jin, LUO Xiaoshu

College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004,China

Received:2015-12-10 Online:2016-06-25 Published:2018-09-14

摘要/Abstract

摘要： 本文根据小波变换具有时频分析的特点,提出一种通信系统中QPSK(quadrature phase shift keying)信号解调的新方法。该信号解调新方法与传统的QPSK相干解调方式不同之处在于,首先它是直接对接收到的QPSK信号中的频率和相位(相当于瞬时值)进行提取和判决,是一种具有多分辨特性的时频分析检波方法;其次,发送端信号和接收端信号之间不需要严格同步,是一种“盲检测”方法。仿真结果表明:该新的信号解调方法在抗噪声性能和抗复杂信道的鲁棒性等方面具有比传统解调方法更优异的性能。

关键词: 小波变换, 时频分析, QPSK, 盲检测, 鲁棒性。

Abstract: According to the characteristics of the time-frequency analysis of the wavelet transform, a novel QPSK(quadrature phase shift keying) signal demodulation method in the communication system is proposed. The novel demodulation method for QPSK signal is different from the traditional demodulation method. First of all, it can directly extract and decide the frequency and phase (equivalent to the instantaneous value) of the received QPSK signal and it is a time-frequency detection method which has the multi-resolution properties; second, it is a "blind detection" method without strict synchronization between the transmitter signal and receiver signal. The computer simulation results show that the novel signal demodulation method has better performance than the traditional one in anti-noise property and robustness of anti complex channel.

Key words: wavelet transform, time-frequency analysis, QPSK, blind detection, robustness

中图分类号:

TN911

陈锦, 罗晓曙. 一种新的基于小波变换的QPSK信号解调方法[J]. 广西师范大学学报（自然科学版）, 2016, 34(2): 35-45.

CHEN Jin, LUO Xiaoshu. A Novel QPSK Signal Demodulation Method Based on Wavelet Transform[J]. Journal of Guangxi Normal University(Natural Science Edition), 2016, 34(2): 35-45.

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一种新的基于小波变换的QPSK信号解调方法

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