how to change amplitude? phased.FMCWWaveform

How can I change the amplitude of in "phased.FMCWWaveform" ? Its default value is 1 but i want to change it and i don't know how?

please someone help ne in this issue, thanks

Answer 1

[Pratyush Roy]

Hi Khurram,

One cannot directly set the amplitude value using the phased.FMCWWaveform.

As a workaround the step function on the FMCW Waveform object can be used to get the values of the signal in time-domain and scale that with an amplitude value.

The following code snippet illustrates the use of the step function:

waveform = phased.FMCWWaveform('SweepBandwidth',100.0e3,...
'OutputFormat','Sweeps','NumSweeps',2); % Get the FMCW waveform object with particular specifications
wv1 = step(waveform); %Generates the complex values obtained from the FMCW signal in time domain
wv_real = amp*real(wv1); %amplitude of the signal is scaled to the value amp
plot(wv_real)

In case of an amplitude which is time varying one can multiply the amplitude vector with the "wv1" vector element-wise:

wv_real = amp.*real(wv1);

You can go through the following links for further help

https://www.mathworks.com/help/phased/ref/phased.fmcwwaveform-system-object.html#rs3nn93-2

Regards,

Pratyush.