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The authors study the resource allocation problem in OFDMA based 802.16 broadband wireless access systems. Frequency and time resources must be allocated by a central controller (Base Station) to a number of users. They consider variations of a resource allocation problem, some of which are difficult to solve. Situations in which only the objective of the Base Station need to be maximized are easily dealt with as are cases where all the users perceive the same channel conditions. Scenarios where both the objectives of the BS as well as those of the end users must be met simultaneously require more complicated solutions since individual users experience different channel conditions. They present linear programming relaxations for the resource allocation problem.
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