Filter Design(Complex Bandpass Filter)

Started by adnan kiani January 10, 2008
I need some help regarding complex bandpass filter design. The task is to design a complex BPF with passband at 8-12MHz and stopbands at -16-7MHz and 13-16MHz. The idea is to design with through complex modulation of proper lowpass prototype filter. I was wondering how to include the negative frequencies if i design it using firpm/remez function. The LPF has passband at -2 to 2MHz and stopbands at -26MHz to -3MHz and 3MHz to 6MHz and modulating this LPF with an exponential of 10MHz we can achieve the desired filter response(I'm not sure abt this). Anyone who can help, please reply.
Thanks in advance..