If the lspci command on your computer give the following configuration for your Network Controller :
02:00.0 Network controller: Broadcom Corporation BCM43225 802.11b/g/n (rev 01)
Then to get the wireless up on your system follow these steps :
for Debian (Easy Way)
1.Install the following package for your Debian distribution : firmware-brcm80211_0.27_all.deb
for Debian (Long way)
1.Install Module Assistant , broadcom-sta-common_5.60.48.36-2_all.deb ,broadcom-sta-source.
2.Run the module-assistant from the command select the broadcom driver and then do get , build and install sequentially .
for Fedora
1. Install the following packages
broadcom-wl-5.60.48.36-1.fc13.noarch.rpm
kmod-wl-[uname -r]-5.60.48.36-1.fc13.5.i686.rpm
kmod-wl-5.60.48.36-1.fc13.5.i686.rpm
2.Do system-config-network and probe new hardware accepting all the default options
Reboot and enjoy.