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Tuesday, 14 March 2017

Communication Systems - IV


Classification of Pulse Modulation:
Pulse modulation could be classified as: Pulse Amplitude Modulation (PAM), Pulse Duration Modulation (PDM) or Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM).

Demodulation:
Demodulation is the process of recovering the signal intelligence from a modulated carrier wave.

Transmitter:

Receiver:

Detection of an AM signal:
AM detection, which is the process of recovering the modulating signal from an AM waveform, is carried out using a rectifier and an envelope detector.

Internet:
It permits communication and sharing of all types of information between any two or more computers connected through a large and complex network.
The application includes,
a) E- mail
b) File transfer
c) WWW
d) E- commerce
e) Chat

Mobile Telephony:
The concept of this system is to divide the service area into a suitable number of cells centred on an office called MTSO (Mobile Telephone Switching Office). Each cell contains a low-power transmitter called a base station and caters to a large number of mobile receivers (popularly called cell phones). When a mobile receiver crosses the coverage area of one base station, it is necessary for the mobile user to be transferred to another base station. This procedure is called handover or handoff.

Facsimile (FAX):
It scans the contents of a document (as an image, not text) to create electronic signals. These signals are then sent to the destination (another FAX machine) in an orderly manner using telephone lines.Then the signals are reconverted into a replica of the original document.

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