ISSN : 1796-2021
Volume : 2    Issue : 5    Date : August 2007

A Link Adaptation Algorithm in MIMO-based WiMAX Systems
Tsz Ho Chan, Mounir Hamdi, Chui Ying Cheung, and Maode Ma
Page(s): 16-24
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In order to extend the coverage of wireless communication to metropolitan scale, the Worldwide
Interoperability for Microwave Access (WiMAX) standard was developed and ratified as the IEEE
802.16d standard in June 2004. The standard defines an adaptive modulation framework which
allows a WiMAX system to communicate with various burst profiles according to the link quality. The
selection mechanism of a suitable burst profile is left open for research. In this paper, we devised a
novel link adaptation algorithm with dynamic threshold probing based on an extension of our
previous work on a MIMO-based WiMAX systems simulation framework. Our algorithm was capable
of quickly adapting to channel conditions using PHY layer metrics and MAC layer statistics.
Evaluation showed that our algorithm could achieve high system throughput while minimizing the
packet drop rate significantly.

Index Terms
WiMAX, link adaptation, MIMO, algorithm, cross-layer design