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Unequal Error Protection (UEP) is the key to future multi-layer and scalable data and video transmission. This paper presents a novel bit-loading and channel adaptation technique to realize UEP properties in the physical transport using greedy and sub-optimal bit-loading algorithms. In this case, the authors exploited the power minimization approach developed by the greedy algorithm to allow for an arbitrary number of classes, arbitrary SNR margins between the classes, and arbitrary numbers of bits per class. They achieved similar results using a fast sub-optimum power minimization bit-loading algorithm based on Campello's algorithm.
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