It sounds like you don't have a wireless access point, rather a wireless router. Try setting the DHCP on it to a different subnet e.g. 192.168.1.0/24
Do you mean DHCP on AP or router? if you mean on AP, I cant set it like that cause it is like this 192.168.0.X-192.168.0.Y all I can change in AP is the last number X and Y!
I have a D-link AP dwl-2000AP+