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13-11-2012, 04:16 PM
Post: #1
power line carrier communication abstract
power line carrier communication

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Power Line Carrier Communication:

The communication device used for the communication over the power lines is a MODEM, commonly known as Power Line MODEM (PLM). It works as both transmitter and receiver, i.e., it transmits and receives data over the power lines. A power line modem not only modulates the data to transmit it over the power lines and but also demodulates the data it receives from the power lines. By using modulation techniques, binary data stream is keyed on to a carrier signal and then coupled on to the power lines by PLM. At the receiver end another PLM detects the signal and extracts the corresponding bit stream.
In a PLCC system the communication is established through the power line. The audio frequency is carried by a carrier frequency and the range of carrier frequency is from 50 kHz to 500 kHz. The modulation generally used in these system is amplitude modulation. The carrier frequency range is allocated to include the audio signal, protection and the pilot frequency. The pilot frequency is a signal in the audio range that is transmitted continuously for failure detection.
This is the basic block diagram to transmit the information signal from one place to another place.
In this block The Wave trap, Coupling Capacitor, Matching Devices & PLCC Panel is used at the both end of transmission line. It should be noted that the circuit is same at the both end (transmitting &Receiving end).
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