how to convert a baseband signal with bandwidth 20MHz to an RF signal with center frequency 2.4GHz and the same bandwidth 20MHz

[Samnath]

Hi,

        I was wondering how to convert a complex baseband signal with bandwidth 20MHz to an RF signal with center frequency 2.4GHz and the same bandwidth 20MHz in simulation. I tried 

    1. Multiplying the complex double type baseband signal (1-D array) by exp( j * 2 * pi * 2.4E+9 * T ) where T is the symbol period of baseband signal.

    2. Usage of MT upconvert baseband but doesnt keep the BW constant

Looking forward to your help. 

[ejkaiser]

Hi,

in the time domain this task is typically done be multiplication with a carrier (2.4 GHz). However, what you get is carrier + baseband and carrier - baseband. So you get double bandwidth and must filter one of the sidebands.

Cheers

Edgar

[ejkaiser]

I should add that you can multiply your baseband signal with two carrier signals that are shifted by 90° and then add or subtract the result to obtain upper or lower sideband only. You can try to search about IQ moduilators/demodulators to learn more.

Cheers

Edgar