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20 lines
667 B
Mathematica
20 lines
667 B
Mathematica
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function [y_FM_demodulated] = FM_IQ_Demod(y)
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%This function demodualtes an FM signal. It is assumed that the FM signal
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%is complex (e.g. an IQ signal) centered at DC and occupies less than 90%
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%of total bandwidth.
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d=normalize(y);%normalize the signal to put in unit circle range
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realsignal=real(d); %real part of normalized siganl.
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imagsignal=imag(d); %imaginary part of normalized signal.
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realsignal_delay=realsignal(2:end,1);
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imagsignal_delay=imagsignal(2:end,1);
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size_signal=size(d);
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%最小角度法解调：X(n)=Q(n)I(n-1)-I(n)Q(n-1);
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y_FM_demodulated = realsignal(1:size_signal-1).*imagsignal_delay-imagsignal(1:size_signal-1).*realsignal_delay;
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end
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