Wednesday, April 11, 2007

Adaptive modulation v.s. High order diversity

Today's learning: adaptive modulation may become unnecessary as the diversity order is increased. It can be viewed as a lower-complexity alternative to diversity technologies, such as MIMO.

Remember, adaptive modulation or diversity only offers advantages over fading channels. Adaptive modulation can employ high-order modulation schemes to adapt to the channel state and then increase the system throughput. Diversity utilizes the independent property between two or more links. When only one receiver is provided, adaptive modulation can be employed. But when more than two receivers are available, it is better to use diveristy technologies.

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