Wifi connection for office 100 meter radius - only BSNL available

Dear Sir,

I wanted to take Wi-Fi connection for my Office area of approximately 100mts radius. I need your help to know about the equipments/procedure, to cover this area with WI-FI connectivity. Here I want to mention that only BSNL network is available for this area.

Your help will be highly appreciable.

Thanks and regards
Anurag Mani

Just by a BSNL WIFI router and put it in center of office. Actually whatever connection you have, all you need a wifi AP or router and you can use internet in your whole office. You can also buy another WIFI router if you can't cover area with single AP and use both together where one can work as repeater to extend area.