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• W2024196175 abstract "Current OFDMA systems group resource blocks into subband to form the basic feedback unit. Homogeneous feedback design with a common subband size is not aware of the heterogeneous channel statistics among users. Under a general correlated channel model, we demonstrate the gain of matching the subband size to the underlying channel statistics motivating heterogeneous feedback design with different subband sizes and feedback resources across clusters of users. Employing the best-M partial feedback strategy, users with smaller subband size would convey more partial feedback to match the frequency selectivity. In order to develop an analytical framework to investigate the impact of partial feedback and potential imperfections, we leverage the multi-cluster subband fading model. The perfect feedback scenario is thoroughly analyzed, and the closed form expression for the average sum rate is derived for the heterogeneous partial feedback system. We proceed to examine the effect of imperfections due to channel estimation error and feedback delay, which leads to additional consideration of system outage. Two transmission strategies: the fix rate and the variable rate, are considered for the outage analysis. We also investigate how to adapt to the imperfections in order to maximize the average goodput under heterogeneous partial feedback." @default.
• W2024196175 created "2016-06-24" @default.
• W2024196175 creator A5001700017 @default.
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• W2024196175 date "2013-02-01" @default.
• W2024196175 modified "2023-09-23" @default.
• W2024196175 title "Performance Analysis of Heterogeneous Feedback Design in an OFDMA Downlink With Partial and Imperfect Feedback" @default.
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• W2024196175 doi "https://doi.org/10.1109/tsp.2012.2229275" @default.
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