I did a quick destructive interference extension to my ADS-B ongoing project. Take a look!

## Background

Interference is what happens when two signals with different amplitudes combine. Due to the theory of superposition, the wave’s amplitudes can be added on top of each other. Destructive Interference specifically happens when one signal has a negative amplitude compared to the other; when the amplitudes add, they subtract off of the total amplitude.

## Code

My code is a simple extension of last week’s matlab solution. I found my approximate packet, and reversed the amplitude of each signal. It can be identified below:

``````reverse_packet = -packet1;
reverse_array{i} = reverse_packet;
new_signal = packet1+reverse_packet;
signal_array{i} = new_signal;
``````

This code also takes both the inverse signal and the summed signal (should be a string of 0’s) and saves it into an array.

## Results

In a finite-time script like I have (reading from a data file not in real time), I am able to create inverse values for all of my packets. To visualize them I pick random strings and present their inverse values. The wave output should be 0 here:

``````for i=1:4
nexttile
r = randi(length(packet_starts1));
plot(packets{1,r})
hold on
plot(reverse_array{1,r})
ylim = ([-1.1, 1.1]);