Cross Layer optimization is going to be important

Cross Layer Optimization
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This concept is going to be important from the perspective of developing a cognitive and adaptive WiMAX radio. The use of MIMO and other advanced antenna technologies are going to enhance the PHY layer significnatly. From a simulation perspective a cross layer approach is going to be required in order really show the true performance. the MAC layer side of the system needs to be incorporated with the advanced PHY layer.

There is research in the area of developing better simulations in order ot address the cross layer issues.

Definitely need to consider some of this with regards to cognitive WiMAX