a) The bipolar signal scheme is often used in practical Pulse Code Modulation (PCM)systems due to it possesses one-bit error detection ability. Assume that the binarysource symbols zeros and ones occur equally likely, and let the transmitting filtershaping has an impulse response,D=9hr(t) = AxrectA=51. What are the factors which control the Power Spectral Density (PSD) of thebipolar signaling scheme?2. Construct the Non-Return to Zero (NRZ) bipolar format for the binarysequence10010101011 (be careful to use h7(t) to draw the sequence)3. Determine the PSD of the NRZ bipolar signaling scheme.

1) The Power Spectral Density (PSD) of line codes must be considered while studying their…

Answered: a) The bipolar signal scheme is often…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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3. The role of mixer in the Armstrong modulator is to. a) raise the carrier frequency b) lower the carrier frequency c) to change the carrier frequency to any required value For AMDSB-SC, The carrier is suppressed using a) A mixer b) A frequency multiplier c) A balance modulator 5. In FM modulation, frequency deviation is equal to .........., if the amplitude of the modulating signal is 4 V, and the frequency sensitivity of the modulator is 30 Hz/V. a) 120 Hz b) 34 Hz c) 100 Hz 6. A voltage controlled oscillator (VCO) is an oscillator that its frequency output is varied according to any change in the ............... at its input. 4. a) Frequency b) Current c) Voltage Q1: (B) Draw A block diagram to generate the SSB using Hilbert Transform method, Write an equation for an input, and output signals?
C. Phase reversal D. Modulator's sensitivity factor 39. In linear modulation, the intelligent signal is conveyed in A. The amplitude of the transmitted signal BA The sideband components of the transmitted wave C. The phase deviation modulated signal D. None of the above | 40. What communication technique or modulation scheme make use of channel noise as an added advantage? A. Asynchronous shift key modulation B. Vestigial sideband modulation C. Spread-spectrum D.4 Wideband Frequency modulation |41. Narrowband FM and AM share a lot of similarities except that , A+ The lower side frequencies are 180° out of phase. B. The upper side frequencies are 180° out of phase. C. The sideband frequencies are 180° out of phase. D. None of the above | 42. Modulation is done in , A. Transmitter B. Radio receiver C. Between transmitter and radio receiver D. None of the above |43. At 100 % modulation, the power in each sidebands is, A 50 % В. 40 % С. 60 % D 25 % | 44. In a TV transmission, picture is…
Q2. For the scheme shown in Figure Q2, i. Draw the spectrum of the baseband signal (multiplexer output) for the multiplexer. ii. Determine the bandwidth of the baseband signal (multiplexer output) for the multiplexer. iii. Determine the minimum transmission bandwidth of the multiplexer. Explain, briefly, the modification needed for the multiplexer in the figure to achieve this bandwidth. 3 kHz cos 10,000nt Bascband signal cos? 1000nt Σ cos 22,000rt 4 kHz cos 36,000nt Figure Q2
24/ b
Q1): Use the PCM method to convert the signal below into a digital signal by assuming fm = 1000 Hz and n- 3. 4 -5 0.5 1 1.5 2.5 3 3.5 4 4.5 5 Time(ms) Q2): Use the DPCM method to: 1. convert the signal below into a digital signal by assuming fm = 500 Hz and n = 3. 2. reconstruct discrete signal at the receiver end. 3. calculate the error between the sampled discrete signal at transmitter end and the reconstructed discrete signal at the receiver end. 3 2 -2 3 2 3 4 5 10 1, (HOA) apnadury Amplitude (volt)
For single sideband (SSB) modulation d) Explain with drawing the demodulation process of SSB signal.e) How many single sideband (SSB) stations can be accommodated in a 180 KHz bandwidth if the highest modulating signal frequency fmax is 9 KHz?f) What are the main advantages and disadvantages of single sideband (SSB) modulation compared with ordinary amplitude modulation (AM).
A sinusoidally modulated AM waveform is shown below: Determine: a) Peak amplitude of the upper and lower side frequencies. b) Peak amplitude of the unmodulated carrier. The modulation index. The carrier power and the power in the sidebands. The total transmitted power. 3 0 -3 -9 The transmission efficiency. The amplitude of the carrier which must be added or subtracted to attain a modulation index of 0.5. In AM modulation, the modulation index is kept < 100%, why?
a b c please
Generate a QAM signal: - use the 100 kHz cosine and sine signals as the quadrature carriers. - use a 2 kHz sine as first message on the cosine carrier and the audio signal generator at 1 kHz as the second message for the sine carrier.And show the waveform and the spectrum of the upper path (cosine carrier), lower path (sine carrier) and final QAM. Explain (show calculations) why you obtained such a spectrum.
Plot an AM modulated signal , that has an information signal m ( t ) = 10 sin ( 10nt ) and a carrier signal c ( t ) = 15 cos ( 1000nt ) . Calculate the modulation index ( u ) . Is it a good modulation ? If no , suggest a change in one of the signals above and calculate u again , so that it approaches ideal case

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