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Monday, March 3, 2008

Power-line Communication and Data Transmission

power-line communication
This project is about power-line communication over the low-voltage grid. The main advantage with power-line communication is the use of an existing infrastructure. Wires exist to every household connected to the power-line network.
Project starts with a general introduction to power-line communication. Then an existing application, communicating on a low-voltage grid, is investigated in order to obtain some knowledge of how the power line acts as a communication channel.
The power-line communication channel can, in general, be modeled as having a time varying frequency-dependent signal-to-noise ratio over the communication bandwidth. Robust, low-complexity, modulation methods are investigated which simplifies the implementation of transmitter and receiver.
There are two obvious ways to decrease the strain on the power line infrastructure. One is to build more grids and other is to make the grids more efficient. The latter is a better option because building more inefficient grids will not decrease the problems that are faced with.
The key solution to this problem is Power Line Data Transmission (PLDT). PLDT can ease the congestion and load on the power lines, and also, give the electric companies the chance to offer new services such as broadband internet access and Power on Demand.
A communication strategy is described that eventually could be used for information transfer over the power-line communication channel. In order to achieve effective communication, the transmitter with better impedance matching and frequency modulation techniques are implemented. Similarly receiver is designed with better tuning and filtering to reproduce the exact message.

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