8. (10 Point) Which of the following type of modulation is most bandwidth efficient. a. AM...
below is used to modulate a carrier to generate the AM signal yt) (Am()) cos(1000t) The periodic signal m() shown a) The power efficiency of the system is measured to be 1 () The type of AM modulation, i.e. SSB, DSBSC, (i) The constant A. (ili) The modulation index 1/13. Determine DSB with carrier enit -3 b) An angle modulated signal is given by d(t-2 cos (2n1061+ sin 2 1000). Find i) The carrier frequency. ii) The baseband signal bandwidth....
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CHAPTER 8-NOISE IN MODULATION SYSTEMS a. Describe the characteristics of the following modulation methods. Use the "Comments" column in the table to define the variables, expand on and justify. SSB FM PCM Comments PCM SSB FM PCM- Bandwidth SNR Adjustments SSB- FM PCM- SSB- FM- Salient Characteristics Design a communications alphabet with 16 symbols. Use Amplitude and Phase Modulation (16-QAM). b. Formula of the modulated waveforms Xe (t) i. i. Constellation diagram...
Consider the following Amplitude Modulation (AM) signal given by Xc(t)=Ac[1 + μx(t)]cos(wct) where x(t) is the message signal, and μ the modulation index. Also consider the following message signal x(t) for parts (a) and (b)' shown in Fig 1. a) Provide a sketch of the AM signal when the modulation index μ < 1. b) Provide a sketch of the AM signal when the modulation index μ = 1. c) Provide a sketch of the AM signal when the modulation index μ > 1. d) If the bandwidth...
In a broadcasting communication system, the transmitter power is 40 KW, the channel attenuation is 80 dB, and the noise power spectral density is 10-10 W/Hz. The message signal has a bandwidth of 104 Hz and a normalized message signal power of 0.2 Determine the output SNR if the modulation format of the signal is: (a) DSB-SC (b) SSB-SC (c) Conventional AM with a modulation index of 0.85. (d) FM with a frequency modulation index of 3
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(1) Compute the SNR at reception for the following scenarios: (Provide answers in dB.) (4 points each) (a) AM DSB-LC system with input SNR of 110 and m(u)=0.9. (b) AM DSB-SC system with input SNR of 6 dB. (c) AM SSB-SC system with input SNR of 25. (d) A two stage system, with an AM DSB-SC stage with input SNR of 15 that feeds into an AM DSB-LC stage with m(u) - 0.75. (2) A modulating...
For the baseband signal m(t) = cos(1000πt) cos(3000πt), do the following. (a) Sketch the spectrum of m(t) (b) Sketch the spectrum of the DSB-SC signal m(t)cos(10, 000πt). (c) Identify the upper sideband (USB) and the lower sideband (LSB) spectra. (d) Identify the frequencies in the baseband, and the corresponding frequencies in the DSB-SC, USB and LSB spectra. Explain the nature of frequency shifting in each case.
QUESTION 5Select the correct statement(s) regarding amplitude modulation (AM). a. If the AM Index is greater than 1 (i.e., µAM>1), then over modulation occurs leading to signal distortion b. With AM, the message is captured as amplitude changes to the carrier’s amplitude. c. The AM modulated signal bandwidth is dependent upon the highest frequency (fm), and frequency bandwidth, of the message d. All of the above are correct QUESTION 6 Amplitude Modulation (AM) describes a method where the baseband message...
A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10²πt)) cos(106πt) volts. a) Plot the spectrum of the signal and calculate its bandwidth. b) Calculate the total signal power in dbm. c) If the message signal is a single-tone signal, explain if this is an AM-DSB-SC or an AM-DSB-C signal. What is the modulation efficiency? d) The signal s(t) is passed through the following system. Find the output mout(t) as a function of time and its Fourier transform, Mout(f).
Question A modulated voltage signal is given as: s(t) = 10(1 + 0.5cos(10?rt)) cos(106mt) volts. Plot the spectrum of the signal and calculate its bandwidth. b) Calculate the total signal power in dbm. c) If the message signal is a single-tone signal, explain if this is an AM-DSB-SC or an AM-DSB-C signal. What is the modulation efficiency? d) The signal s(t) is passed through the following system. Find the output mout(t) as a function of time and its Fourier transform,...
Twelve different message signals, each with a bandwidth of 10 kHz, will be multiplexed and transmitted. Determine the minimum bandwidth required for each of the following methods: a-) FDM b) SSB C) TDM D) PAM