QPSK Carrier Signal Detection Based on Double Duffing Oscillators

• Main Authors: Yongfeng WU, Shaoping HUANG, Weicai XIE
• Format: Article
• Language: English
• Published: IFSA Publishing, S.L. 2014-02-01
• Series: Sensors & Transducers
• Subjects: Weak signal detection; Double duffing oscillators; QPSK carrier signal; Low voltage power line communication; Phase information.
• Online Access: http://www.sensorsportal.com/HTML/DIGEST/february_2014/Vol_165/P_RP_0073.pdf

The paper proposed a new method for the detection of QPSK carrier signal that based on double duffing oscillator to solve the problems as high attenuation and strong noise interference in the QPSK carrier communication of low voltage power line. This method has making use of the different phase of QPSK carrier signal to stimulate the double duffing oscillators to enter different states and through the judgment of the state of the double duffing oscillators to detect the phase information that the QPSK carrier signal carries. At the same time, through the study of the system solutions of duffing oscillator, obtained the change rule of them, based on these rules, the paper proposed a discriminant algorithm that used the difference distribution, and this algorithm is characterized by small calculating amount and low error judgment rate. The numerical simulation and experimental test show that the double duffing oscillator method can detect the phase information of QPSK carrier signal in low voltage power line accurately with the low SNR environment.