| CPC H04B 10/6165 (2013.01) [H04B 10/1143 (2013.01)] | 14 Claims |
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1. A receiver comprising:
processing circuitry configured to
extract a clock signal superimposed on a detection signal of light propagated through space;
determine whether or not a signal-to-noise ratio of the detection signal is lower than a signal-to-noise ratio at which the detection signal is demodulated on a basis of an amplitude of the extracted clock signal;
an adaptive filter to compensate a signal value of the detection signal by using a filter coefficient and output a detection signal after signal value compensation;
calculate, as the filter coefficient, a filter coefficient in which a signal value of the detection signal output from the adaptive filter is a reference value; and
store the calculated filter coefficient when the processing circuitry determines that there is no signal-to-noise ratio degradation, and change the filter coefficient used by the adaptive filter to a stored filter coefficient when the processing circuitry determines that signal-to-noise ratio degradation occurs.
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