In a multi-rate wireless network, a node can dynamically adjust its link transmission rate by switching between different modulation schemes. http://ns2code.com/
Concepts involved in multi rate networks:
• To attain throughput in multi- rate ad hoc wireless networks
• a rate selection algorithm to maximize throughput in a multi-hop multi-rate wireless network
• how the classical theory of nonblocking networks was generalized to accommodate multirate switching systems
• to better exploit durations of high-quality channels conditions
• routing decisions in multi-rate ad hoc wireless networks
• define distributed and localized rate-aware broadcast algorithms
• To improve the packet forwarding efficiency
• a rate-adaptive video multicast scheme
• a rate scheduling model
• To maximize the total visual quality for a multicast group subject to the minimum-visual-quality-guaranteed constrain etc.