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Adaptive resource allocation based on perfect Channel State Information (CSI) can significantly improve the performance of Orthogonal Frequency Division Multiple Access (OFDMA) systems. However, in real systems, accurate CSI is impossible because of noisy channel estimates, channel feedback delays, and processing delays. Therefore, only imperfect CSI can be used for resource allocation purposes. In this paper, the authors minimize the impact of errors caused by imperfect CSI and evaluate the significance of periodic CSI feedback in a fast fading environment.
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