In analyzing the performance of an FM discriminator, operating in the presence of noise, the post detection

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In analyzing the performance of an FM discriminator, operating in the presence of noise, the post detection SNR, (SNR)D, is often determined using the approximation that the effect of modulation on (SNR)Dis negligible. In other words, |δ̅ f̅| is set equal to zero. Assuming sinusoidal modulation, investigate the error induced by making this approximation. Start by writing a computer program for computing and plotting the curves shown in Figure 8.14 with the effect of modulation neglected.


Figure 8.14

80 B =20 ß = 10 70 * B =5 60 - ß =1 50 30 20 10 -10 10 15 20 25 30 35 40 45 50 Predetection SNR in dB Postdetection SN

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