How to quantize an audio file to be ready for OFDM?

I am trying to send an audio file over a channel using OFDM. But it keeps giving me an error at the very start:

% Read the audio file
[y, Fs] = audioread('file.wav');
binaryData = dec2bin(quantize(y, 8));

AfterwardsI use PSK modulation, then I convert it from Serial to paralell. And comes IFFT. But here at this line I get this error:

Error using quantize

Inputs of class 'double' are not supported.

I don't understand how I can fix this problem. I tried using int8 but had no luck as I received more errors.

If I am approaching the problem in a wrong way, please tell.

I am somewhat new at everything. I would appretiate any help given.

Answer 1

[Aditya Srikar]

Hi Harry,

The first parameter of quantize() should be a quantizer object.

Please refer the documentation for more details

https://in.mathworks.com/help/fixedpoint/ref/embedded.quantizer.quantize.html

https://in.mathworks.com/help/fixedpoint/ref/embedded.quantizer.html

Hope it helps.