Sunday, December 24, 2017

ook demodulation update

Another small update

The signal has been simplified for now, until I know what is going on. There will be two LEDs for now. These will be turned on and off using OOK modulation. There will be three parts to the signal. The demodulator will use the following sequence;


  • The starter bits are 1 1 0
  • A bit of 1 or 0 to select LED 1 or LED 2 respectively 
  • A bit of 1 or 0 to turn the LED on or off respectively 
The 'starter bits' are longer than any passable following sequence to help prevent errors.

Here is an example of two cases blue LED 1, on and red LED  2 on.
 
I haven't applied the leds yet it's just an idea. I first need to demodulate the signal and remove the nose.

To remove the nose I plan on using a exponential smoothing filter, this is by a recommendation of some stranger I ment at swing dancing.

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