25 June 2002 Capacity efficiencies of time slot allocation schemes for adaptive antenna systems
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Abstract
The performance of the fixed-user-per-slot allocation method and the dynamic slot allocation method for time slot allocation in SDMA (Space-Division Multiple Access) is evaluated. The unsorted/sorted first come first serve (USFCFS/SFCFS), first fit (FF) and modified first fit (MFF) methods are studied. Each slot allocation scheme is evaluated with a number of beamforming algorithms. Two different capacity efficiencies are defined as the thresholds in the slot assignment, with one threshold potentially achieving higher efficiency but sacrificing some of the benefits an adaptive antenna system can provide. The computational complexity of the algorithms is considered when evaluating their performance. We define a new performance indicator, the effective relative angle (ERA), and show that it can be used in evaluating not only the performance of the power gain achieved by the antenna array, but also the capacity efficiency. The system performance benefit of the sorting process for the fixed-user-per-slot allocation method is also studied. Theoretical and simulation results are examined to try to find a rule of thumb for the capacity improvement over a conventional (single antenna) system of an adaptive antenna system using each slot allocation method.
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Garret T. Okamoto, Garret T. Okamoto, Chih-Wei Chen, Chih-Wei Chen, } "Capacity efficiencies of time slot allocation schemes for adaptive antenna systems", Proc. SPIE 4740, Digital Wireless Communications IV, (25 June 2002); doi: 10.1117/12.472956; https://doi.org/10.1117/12.472956
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