How to recover bits coded by different frequency values (states)?

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Sylwia Kantor 2021-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/724877-how-to-recover-bits-coded-by-different-frequency-values-states

回答： Shubham Rawat 2021-2-2

Hello. I'm trying to complete a task. Firstly I was supposed to download a FM modulated signal.

[y,fs] = audioread('Olivia16-500.wav');

And then I have to recover bits that are coded by different frequency values. How can I do that? I was trying demodulation:

fc=1000;
z=demod(y,fc,fs,'fm');

But I don't know what to do next. Can you help me?

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Answer 1

Shubham Rawat 2021-2-2

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Hi Sylwia,

You may use a shift keying techniques and more over to extract bits from a signal you may prepare a table which frequency correspond to what set of bits, and then when you receive a particular frequency based on this table. Now you can extract bits from that.

For Shift Keying Techniques:

https://www.mathworks.com/matlabcentral/fileexchange/66543-shift-keying-techniques

Hope this Helps!