I will assume that your are trying to port forward for your torrent client and/or playing game/s clients.
Unfortunately if you are using a wireless broadband, you are somewhat connecting to a globe DHCP router, hence your portforwarding on your router would not work because the internet that is coming out from your wireless stick is already filtered by the network administrator.
This has nothing to do with DHCP servers blocking packets. Why?
If you are using a DSL connection on the other hand has a different setup, your modem is still connected to the DHCP server of your ISP, BUT the authentication is being provided by your modem, hence, you can portforward using this type of connection.
Always remember you can only portforward on a device which terminates/orginates your connection. The same is true if you have a DSL modem connected to a router but the modem should be on BRIDGE mode before you portforward on your router.
You can always PM me if you need clarification. Kindly tag your thread accordingly!