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Unformatted text preview: EE 308: Communication Systems IIT Bombay, Dept. of Electrical Engineering Semester: Autumn 2009 Instructor: B. K. Dey Assignment 2: Amplitude Modulation - DSB-FC,DSB-SC,SSB,VSB Date: 14 August 2009 1. For each of the following baseband signals: 1. m(t) = 2cos 1000 t + cos 2000 t 2. m(t) = 2cos 1000 t + cos 2000 t (a) Sketch the spectrum of m(t). (b) Sketch the spectrum of the DSB-SC signal m(t)cos 10 , 000 t. (c) Identify the upper sideband (USB) and the lower sideband (LSB) spec- tra. (d) Identify the frequencies in the baseband, and the corresponding fre- quencies in the DSB-SC, USB and LSB spectra. 2. Below gure shows a scheme for coherent (synchronous) demodulation. Show that this scheme can demodulate the AM signal [A + m(t)] cosω c t regardless of value of A. 3. For the AM signal shown in below gure with μ = 0 . 8 : (a) Find the amplitude and power of the carrier. (b) Find the sideband power and power e ciency η ....
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- Spring '09
- Electrical Engineering, Single-sideband modulation, LSB, Single Sideband Modulation, DSB-SC signal