| 摘要 |
A method and a device for monitoring and controlling a phase difference based on DQPSK modulation are provided in the invention, and the method includes: performing the n th power multiplication operation respectively on a first differential current signal and a second differential current signal output after DQPSK demodulation to correspondingly obtain a first monitor signal and a second monitor signal, where, n is a positive integral multiple of 4; monitoring a phase difference between two arms of a first demodulator according to the first monitor signal; monitoring a phase difference between two arms of a second demodulator according to the second monitor signal; adjusting the phase difference between the two arms of the first demodulator and the phase difference between the two arms of the second demodulator using the above monitor result, so that the differences can meet the requirements of demodulation respectively and a receiver can obtain transmitted information by the first differential current signal and the second differential current signal. In the invention, the direction of phase error between two arms of a demodulator can be judged, and the phase difference can be monitored and controlled more precisely, thereby restoring the transmitted information accurately. |
