How to do complex bandpass filter in matlab?

I know the theory behind the topic but i didn't manage to create the filter with matlab. I'am using firpm command to first create the low pass filter.

Could someone give a short example how it's done with some bandpass range?

Answer 1

[Wayne King]

You have to use cfirpm() not firpm() and then specify your constraints.

For example:

 b = cfirpm(30,[-1 -.5 -.4 .7 .8 1],@lowpass);
 fvtool(b); % View filter response.

[Vili]

thanks for answer but I think it coulb be done with firpm. First you have to do a lowpass filter prototype with firpm and then multiply that using a complex exponential to get the actual complex filter impulse response.