Electronics Work Assignment, Assignments of Communications Engineering

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Homework 5

Due Date: 11/23/2020 11:59 pm

Homework 5 Due Date: 11/23/2020 11:59 pm 5-3. For the AM signal given in Prob. 5-2, (a) Evaluate the average power of the AM signal. (b) Fyaluate the PEP of the AM signal. 5-16 An SSB-AM transmitter is modulated with a sinusoid m(7) =5 cos w,t, where w, = 27}. fj =500 Hz, and A. = 1. (a) Evaluate n(t). (b) Find the expression for a lower SSB signal. a(S) ne s(t) ~Q a(t) T o-tan | v(t) Oscillator Oscillator v7(t) 1 f=z8| party + , ~\ s(t m(t) v Y Modulation _oo° _oy Sy SSB input oulpul phase phase shift shift val!) (1) Low-pass 62) a(t) nee v(t) Q vio (t) — o-tar — Figure P5-13 Weaver’s method for generating SSB. (c) Find the RMS value of the SSB signal. (d) Find the peak value of the SSB signal. (e) Find the normalized average power of the SSB signal. (f) Find the normalized PEP of the SSB signal 5-28 A sinusoidal modulating waveform of amplitude 4 V and frequency | kIIz is applied to an TM exciter that has a modulator gain of 50 Hz/V. (a) What is the peak frequency deviation? (b) What is the modulation index? 5-29 An FM signal has sinusoidal modulation with a frequency of f,, = 15 kHz and modulation index of B=2.0. (a) Find the transmission bandwidth by using Carson’s rule.