| CPC H04B 10/60 (2013.01) [H04B 10/69 (2013.01); H04B 10/693 (2013.01)] | 12 Claims |
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1. A signal demodulation method, comprising:
acquiring a signal to be demodulated;
performing direct current blocking and bias processing on the signal to be demodulated to obtain a processed signal; and
comparing the processed signal with a preset decision signal, and obtaining a demodulation signal according to a comparison result,
wherein said acquiring a signal to be demodulated comprises:
receiving an optical power signal;
performing photoelectric conversion on the optical power signal to obtain a modulation signal; and
performing low-pass filtering processing on the modulation signal to obtain the signal to be demodulated,
wherein said performing direct current blocking and bias processing on the signal to be demodulated to obtain a processed signal comprises:
performing direct current blocking processing on the signal to be demodulated to obtain an alternating current signal;
superposing the alternating current signal with a preset bias voltage signal to obtain a superposed signal; and
performing gain processing on the superposed signal according to a preset gain coefficient to obtain the processed signal,
wherein said performing gain processing on the superposed signal according to a preset gain coefficient to obtain the processed signal comprises:
performing gain processing on the alternating current signal in the superposed signal based on a first preset gain coefficient, and performing gain processing on the preset bias voltage signal in the superposed signal based on a second preset gain coefficient, so as to obtain the processed signal, wherein the first preset gain coefficient is equal to or not equal to the second preset gain coefficient.
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