| 摘要 |
A method and a device for monitoring and controlling a phase difference based on DQPSK modulation are provided, and the method includes: performing the nth 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 phase differences between respectively two arms of a first demodulator according to the first monitor signal and two arms of a second demodulator according to the second monitor signal; adjusting the phase differences between respectively two arms of the first demodulator and two arms of the second demodulator using the monitor result, so that the differences can meet demodulation requirements and a receiver can obtain transmitted information.
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