Adaptive Antenna System


Is there any document / link that explains the Adaptive Antenna System (AAS) w.r.t WiMAX in detail . I did search , but got only high level idea about Adaptive Antenna System.

- An Adaptive Antenna System (AAS) can focus its transmit energy to the direction of a receiver. While receiving, it can focus to the direction of the transmitting device. Some of the techniques used a) Beamforming or beamsteering or beamshaping. b) SDMA (Space Division Multiple Access) for multiple SSs that are separated (w.r.t space) to transmit and receive at the same time over the same sub-channel.

But, i would liket to have more info regarding the techniques and its implementation w.r.t WiMAX. I do not find any elaborative tutorial/pdf/link/document w.r.t this in internet. Any links/pdfs ?

Thx in advans, Karthik Balaguru

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