Explain the advantage and disadvantage of ASK modulation. A binary data with 100

Question

Explain the advantage and disadvantage of ASK modulation.

A binary data with 100 bps rate is once modulated on ASK, once on PSK and once on FSK. Explain which modulation demands more RF bandwidth.

What are advantage and disadvantage of DPSK over PSK?

Compare the delay type in DPSK modulator and demodulator. For which one you may use digital device and for which one you have to use analog device.

What are the advantages of GMSK over FSK and what real-life communication system uses this modulation?

Explanation / Answer

1) Advantages of ASK: a) Easy to implement and its Detection(demodulation) is also Easy One important advantage of ASK is it need lees bandwidth than FSK.

.b) ASK is used to transmit digital data over optical fibre, to transmit moarse code etc.

DISADVANTAGE: It is very much affected by noise,here probability of error is maximum.ASK is linear and sensitive to atmospheric noise, distortion.It requires excessive bandwidth and is therefore a waste of power.

Bandwidth For ASK is given by: 2*(Bit Rate) = 2*100=200 Hz

Bandwidth For PSK is given by: 2*(Bit Rate) = 2*100 = 200Hz.

Bandwidth For FSK is given by: F1 + F2 + 2*(Bit Rate), which would be greater than ASK and PSK Rf Bandwidth,hence FSK requires max. bandwidth.

GMSK has advantages over FSK because it reduces the sideband power (or the power that frequencies directly above or below a given channel produce), which prevents the interference from signal carriers on adjacent frequencies( or undesired frequencies).

AAPLICATIONS IN real life communication.

This is mostly advantageous to cell phone companies, which must ensure that their signals do not pick up any interference from other companies.

GMSK is used mostly in MSK applications to perfect the transmission of digital data from satellites and radio broadcasting towers to mobile devices as well as from mobile devices to satellites and radio broadcasting towers.

GMSK is used in remote controlled devices, cellular phones, Bluetooth headsets etc.

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