[Discuss-gnuradio] Reply: Subject: FM transmitter on MatLab and transmission on USRP

[senthil murugan]

Hi Rakesh,

In GNU Radio, FM demodulator is implemented digitally as

a = present_complex_sample * conj(previous_complex_samples)

out[current] = some gain * arctan ( imag(a), real(a) ); //demodulated FM signal

So, you can also implement the same for demodulating FM signal in MATLAB. Recorded FM files may already be available in internet. So, use that file and test your MATLAB code.

For connecting USRP to Matlab, toolbox is already released by Mathworks from 2011 versions. If using older version of Matlab, you can use http://www.flexible-radio.com/tools4sdr/download   third-party plugins. But, you can only use RFX 900 board which will not support FM reception freq.range :-(

Hope this might help you,

Senthil