Hello Rashmi,
Please look into the below treads it may help you
http://www.cisco.com/c/en/us/support/wireless/aironet-1830-series-access-points/products-installation-and-configuration-guides-list.html
http://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/mobility-express/q-and-a-c67-734485.html