PSK31 Demodulation (Kurt & Michael): Difference between revisions
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Our receiver is split into several steps: |
Our receiver is split into several steps: |
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# We read in the message from a wav file and generate utility signals and matrices. |
# We read in the message from a wav file and generate utility signals and matrices. |
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# We run the signal through an FFT and average over the range of the FFT spike to obtain a carrier frequency guess. |
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=== Code === |
=== Code === |
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Revision as of 20:16, 12 December 2012
Project Description
The goal of this project is to design and code a Matlab script that will encode and decode a PSK31 signal including signals with noise. The receiver should be able to read in signals (as a wav file) from other sources as well.
PSK31 is a audible text encoding that can be sent over the air by amateur radio operators. A computer's sound card can be used to send and receive the signal since the signal is audible. For more information regarding PSK31 see the Wikipedia article.[1]
Our Approach
Code Overview
Transmitter
Our code creates a PSK31 signal given an input carrier frequency and message. For testing our receiver code, the transmitter is setup to generate a random carrier frequency and phase. It also adds random noise to the signal before writing it to a wav file.
Receiver
Our receiver is split into several steps:
- We read in the message from a wav file and generate utility signals and matrices.
- We run the signal through an FFT and average over the range of the FFT spike to obtain a carrier frequency guess.