Method and apparatus for power line communication network
A reliable method and apparatus for communications over AC power lines that may have substantial interference is disclosed. A controller can be plugged into an AC outlet and communicate with a device plugged into any other AC outlet over the power lines within the facility. The controller may perform an analysis of the interference that is present on the power lines that run throughout the facility. In some cases, the particular path for power line signals can be selected to reduce the potential for interference. In some cases, the controller has a front end that comprises a Fast Fourier Transform (FFT) module and a neural network. In addition, devices under the control of the controller may have neural networks that can be used in combination to form a collaborative neural network.
1 . A power line communication controller comprising:
a) a front end comprising:
i. a spectrum analyzer having an input coupled to an AC outlet into which the controller is plugged and configured to detect, analyze and output the spectral content of a power line; and
ii. a signal generator configured to output commands to be transmitted over the power line;
b) a communication processor having an input and an output, the input coupled to the output of the spectrum analyzer and configured to:
i. receive the spectral content of the power line;
ii. determine, from the spectral content, when interference is present and when communications can be transmitted over the power line with a predetermined likelihood of success and which frequencies are clear of interference at a particular time and send a transmission at a particular frequency and time when interference is unlikely to be present; and
iii. output control signals to the signal generator to control the transmission of the commands output by the signal generator based on an analysis of the spectral content, the analysis having been received from the spectrum analyzer, the control signals causing the transmission of the command output to occur when the power line is clear enough of interference that the communications can be transmitted over the power line with the predetermined likelihood of success.
2 . The power line communication controller of claim 1 , wherein the spectrum analyzer is a Fast Fourier Transform (FFT) module.
3 . The power line communication controller of claim 1 , wherein the spectrum analyzer is a filter/detector module.
4 . The power line communication controller of claim 1 , wherein the output of the spectrum analyzer is a sequence of words, each word representing whether interference present on the power line is above a predetermined threshold.
5 . The power line communication controller of claim 4 , wherein the predetermined threshold is set based upon a determination as to the amount of interference that would result in an unacceptable likelihood of a successful communication between the power line controller and a device to which the power line controller is attempting to send commands.
6 . The power line communication controller of claim 1 , wherein the communication processor comprises an artificial intelligence module.
7 . The power line communication controller of claim 6 , wherein the artificial intelligence module is a neural network.
8 . The power line communication controller of claim 7 , wherein the neural network determines the likelihood that communications from the power line communication controller will be successfully received by a device plugged into an AC output on the power line.
9 . The power line communication controller of claim 8 , wherein the neural network predicts when communications from the power line communication controller to at least one device plugged into an AC outlet of the power line will have a likelihood of success that is acceptable.
10 . The power line communication controller of claim 8 , wherein the neural network predicts which frequency from among a predetermined set of frequencies will support communications from the power line communication controller to at least one device plugged into an AC outlet of the power line with an acceptable likelihood of success.