Q2.
(a)
With appropriate block diagram, describe two methods/principles of
demodulating a Frequency Modulation (FM) signal.
(b)
Consider a frequency modulated signal FM )]sin(cos[)(tttsmcωβω+=
where mω is the frequency of a sinusoidal message signal, cω is the
carrier frequency and β is the modulation index.
i)
Using the above equation )(ts, explain the definition of Narrowband
FM and wideband FM.
ii)
Prove that the narrowband FM signal is given by the equation
)sin()sin()cos()(ttttsmccωωβω−=.
(c)
An angle modulated signal is given...
According to the perspective of QPSK digital signal processing,
design a block diagram for the given diagram below
and explain for the given diagram (how does the signal go
through the given diagram).
The following figure is a homodyne detection for
coherent optical fiber communications . Once is the signal from
laser and the other one is the local oscillator. After the QPSK
demodulation, the electric field E will go through the photo diode
detection. (you dont have to consider the...
Estimate the desired parameters and draw the block diagram of an
Armstrong indirect FM modulator to generate an FM carrier with a
carrier frequency of 102 MHz and Δ?=25 kHz based on following
constraint:
A narrow-band FM generator is available at a carrier frequency
200 KHz and Δ? is 12.2 Hz.
The local oscillator has an adjustable range of 9 MHz to 10
MHz.
There is bandpass filter with any center frequency.
And only doublers are...
Estimate the desired parameters and draw the block diagram of an
Armstrong indirect FM modulator to generate an FM carrier with a
carrier frequency of 102 MHz and ∆? = 25 kHz based on following
constraint: (1) A narrow-band FM generator is available at a
carrier frequency 200 KHz and ∆? is 12.2 Hz.( 2) The local
oscillator has an adjustable range of 9 MHz to 10 MHz. (3) There is
bandpass filter with any center frequency. (4) And only...
What method(s) should be used to monitor if risks are being
triggered? Describe the method(s) that should be used to identify
and plan responses to newly identified risks. Describe the
method(s) to use to review and update any contingency reserves.
Describe the timing on all of the above. For example, some you may
do daily, others weekly, others monthly. Perhaps these tasks will
be done as part of your regular status meetings or at special
meetings to discuss risk.
Draw block diagram of the JPEG default encoder for encoding
still colour image.
Describe progressive and hierachical mode of JPEG compression
standard, respectively
Describe how image artifacts occur in decoded still images