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Despite significant advances in physical layer technologies, today's Wireless LAN still cannot offer the same level of sustained bandwidth as their wired brethren. The advertised 54 Mbps bandwidth for IEEE 802.11a/g based hardware is the peak link-level data rate. When all the overheads - MAC contention, 802.11 headers, 802.11 ACK, packet errors - are accounted for, the actual good put available to applications is almost halved. In addition, the maximum link-layer data rate falls quickly with increasing distance between the transmitter and receiver. The bandwidth problem is further aggravated for multi-hop ad hoc networks because of interference from adjacent hops in the same path as well as from neighboring paths.
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