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Most cellular standards for the forthcoming Beyond 3G (B3G) and 4G technologies state Orthogonal Frequency-Division Multiple Access (OFDMA) as the preferred multiplexing technique. OFDMA combines an efficient multiple access with Adaptive Quadrature Amplitude Modulation (AQAM) to maximize system performance while keeping the errors below a certain target. In order to achieve this objective, Channel Quality Indicators (CQI) are fed back from the receivers. However, potential errors and/or delay in the reception of such CQI as well as imperfect channel estimation may lead to system performance degradation. This paper analyzes the impact of an imperfect adaptation on a Long Term Evolution (LTE) cellular network.
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