Filter to be used for FSK modulator

[Ninuts]

Hi,

I am designing a FSK modulator which uses serial bit transmission.

Currently I am stuck at the choice of Filter to be used in the transmitter.

Which one is more suitable raise cosine filter or gaussian filter. And what criteria determines my choice?

Can anyone help me with this?

[charan langton]

Use Gaussian of it is fading link such as a cell phone link that goes through urban environment and RRC if tis a log-normal or line of site link.

Charan Langton