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Principles of Communication Engineering In amplitude modulation, the total bandwidth required is (i) fm (ii) 2fm (iii) fc + fm (iv) fc - fm20252mPrinciples of Communication Engineering A frequency-modulated (FM) signal with a frequency deviation of 75 kHz and a modulating frequency of 5 kHz has a modulation index of: (i) 15 (ii) 50 (iii) 75 (iv) 10020242mPrinciples of Communication Engineering Define power spectral density and bandwidth efficiency. Explain their importance in digital modulation.20257mPrinciples of Communication Engineering Which of the following is an advantage of PCM over analog modulation techniques? (i) Requires less bandwidth (ii) Higher noise immunity (iii) Simpler receiver design (iv) Lower power requirements20242m