International Journal of Computer Networks and Communications Security (IJCNCS)
"An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. The architecture of the IEEE 802.11 WLAN is designed to support a network where most decision making is distributed to the mobile striation. The first, IEEE Standard 802.11a, is an Orthogonal Frequency Domain Multiplexing (OFDM) radio in the UNII bands, delivering up to 54Mbps data rates. The second, IEEE standard 802.11b is an extension to the DSSS PHY in the 2.4GHz band, delivering up to 11Mbps data rates."