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8. What is a goal of pulse shaping? ( ) A. Hiding the information in the...
7. A mode-locked Ti:Al203 laser with a cavity length of 1.5m and center wavelength of 790nm is used for optical frequency metrology. If the pulse duration is 20fs, and the laser has a hyperbolic secant square pulse profile a) Estimate the frequency bandwidth of the laser output.HINT: AtAf0.315 b) Estimate the number of modes in the laser output. c) If the pulse to pulse carrier envelope phase changes by 0.1rad, calculate the carrier offset frequency shift HINT: ΔωςΕ-ter d) What...
7. (5 Points) In a Polar NRZ format, a) complete pulse duration b) O half pulse duration c) O 1 is transmitted by a positive pulse and O is transmitted as a negative pulse d) 1 is transmitted by a positive pulse and O is transmitted as a zero e) None of the mentioned EXPLANATION: 8. (5 Points) QAM modulation scheme where each symbol consit of a) 4 bits b) 2 bits c) O 1 bit d) IM the number...
4. Nyquist pulses. Let 9rx[n] be a (discrete-time) pulse shaping filter, Grx[n] be the causal) matched filter for 9rx[n], and p[n] be the convolution of grx[n] and gex (n). Suppose that p[n] is a Nyquist pulse. Finally, let there be P = 7 samples per symbol interval. Answer the following as "always true" or "possibly false," and give a brief reason. (a) p[0] = 0 (b) p[0] = 1 (c) p[7] = 0 (d) 9tx[0] = 1 (e) 9rx[7] =...
Q2 Fig.2 is a simplified diagram of a WCDMA system downlink signalling 20 construction, in which different channelization code CensF are used to PAPER CODE: EEE326/17-18/S2/ exam Page 2 of 6 separate different physical channels in downlink whilst the scrambling code Sa is used to differentiate the BSs. Each physical channel is assigned to different user with a gain factor Gi. Assume QPSK modulation is employed for digital transmission and the spectrum is 3.84 MHz. One user has a data...
question 2
Question 2: (10 points) A narrowband signal has a bandwidth of 8 kHz centered on a carrier frequency of 150 kHz. It is proposed to represent this signal in discrete-time form by sampling its in-phase and quadr ature components individually. What is the minimum sampling rate that can be used for this representation? tify you Jus answer. How would you reconstruct the original narrowband sig ampled versions of its in-phase and quadrature components?
Question 2: (10 points) A...
KS31603 SULIT/CONFIDENTIAL QUESTION 4 (20 marks) (a) A message signal has a peak voltage of 1V and its average power is 125 mW. Design a PCM system (find minimum value of R of the R bit A/D) with uniform quantization to achieve at least a signal to quantization noise ratio of 36 dB. What is the signal to quantization noise ratio obtained in your design? [6 marks] (b) If the signal is sampled at 9kHz in 4(a), what is the...
3.(30 points) Pulse Code Modulation A-to-D Ideal Lowf Pass Filter xit)- #x) cos(2rfet) (10 points) Consider the system in the above figure. The ideal low pass filter is one which has a brick-wall frequency response (or an ideal sinc function for its impulse response). If the bandwidth of the ideal low pass filter is IkHz and B 2kHz is the bandwidth of a bandpass signal x(t) that is centered at fo 19700Hz, determine the minimum sampling rate fs to avoid...
1. [20 points] An angle modulated signal is given as d(1-8 cos(wl + 2 sin (5000π1)) with carrier frequency 1 MHz (a) Find the power of the modulated signal (b) Find the frequency deviation and the phase deviation (c) Find the bandwidth of the modulated signal (d) Repeat the above parts when the signal is ф(1) : 7 cos(wct + 10 sin( 1300nt) + 12 cos(6000t))
46. What is meant by the term deviation ratio? a. The ratio of the audio modulating frequency to the center carrier frequency. b. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency c. The ratio of the carrier center frequency to the audio modulating frequency d. The ratio of the highest audio modulating frequency to the average audio modulating frequency. 47. What is a wave front? a. A voltage pulse in a conductor. b. A...
10. Answer the following questions: 10.1 What characteristic of the carrier wave is changed to represent the data in ASK? a. amplitude b. frequency c. phase d. period 10.2 What kind of keying or modulation changes both the amplitude and phase of a carrier wave to represent data? a. FM 6. FSK c. PSK d. QAM 10.3 PSK is keying, not analog modulation. a. true b. false 11. Match. Data is the original information and signal is the information as...