iam using laptop dell inspiron 15R 5537 ... using dell wireless card 1705 ... and wireless is not defined on any linux distro i tried (ubuntu , debian , elemetary OS luna , gentoo ) :( i searched google for it .. but i couldn't find any useful solution ..btw when it type  ifconfig  .. it displays lo and eth0 only  .. and iwconfig  no wireless driver ... and lspci it contain the network ethernet but no wireless defined 
get driver for dell wireless card
linux;wifi
Then there is no driver for that card available. Perhaps a bleeding-edge distribution (rolling experimental release like Fedora's rawhide) has this enabled, or there is an experimental driver you can compile yourself. You might rummage in Linux wireless, perhaps there is something cooking there. I seem to remember Dell offered (offers?) some of it's machines with Linux preinstalled, perhaps you can find a driver there.As a workaround, there are some USB WiFi cards that do work with Linux (but check them out first, I've got one at home that worked fine but only with open networks, any sort of encryption made it loose connection after a few minutes; should check how it goes now...).