Telcommunication laboratory ybu engineering solution homework quizz exam (15)

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YILDIRIM BEYAZIT UNIVERSITY EE 305 – TELECOMMUNICATIONS 1 PRELIMINARY MANUAL – 2 – DSB and SSB Modulation & Demodulation Preliminary work: 1) Two signals m1(t) and m2(t),amplitude of 2Vp-p, both band limited to 5000 rad/s are to be transmitted simultaneously over a channel by the multiplexing scheme shown in Figure . The signal at point b is the multiplexed signal, which now modulates a carrier of frequency 20000 rad/sn. The modulated signal at point c is transmitted over a channel. a-) Sketch signal spectra at points a, b and c. b-) Design a receiver to recover signal m1(t) and m2(t) from the modulated signal at point c.

Figure

2) A SSB signal is generated by modulating a fc carrier by the signal m(t) = cos 2000π.t The amplitude of the carrier is Ac. (a) Determine the hilbert transform of m(t). (b) Determine the time domain expression for the Lower Sideband of the SSB signal. (c) Determine the magnitude spectrum of the Lower Sideband SSB signal. (d) Calculate the power of the SSB signal. (e) Bandwidth = ?


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