Question: In analyzing the performance of an FM discriminator, operating in the presence of noise, the post detection SNR, (SNR) D , is often determined using

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, |Î´Ì… fÌ…| 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 = 10 70 * B =5 60 - =1 50 30 20 10 -10 10 15 20 25 30 35 40 45 50 Predetection SNR in dB Postdetection SNR in dB

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