I need to jam GSM signals in-order to prevent mobiles in near-by vicinity from connecting to the BTS. I am employing a noise based jamming strategy. What type of noise will be most appropriate for this task?
Almost any kind on in-band interference (like Gaussian noise) will mess up the GSM signal and prevent its correct reception. Note, however, that:
- Transmitting on the GSM band without a license is illegal in many locations.
- Tampering with cell phone operation in general is also illegal.
If you insist on doing this, one approach would be to set up a GSM base station using OpenBTS in an environment where your signals won't interfere with other base stations and won't be otherwise detected (for example in a laboratory with RF shielding). You can use unlocked phones to connect to your OpenBTS base station, and then measure the effect of your interefernce on their performance.