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• W2169791475 abstract "Orthogonal frequency division multiplexing (OFDM) is a practical broadband signaling technique for use in multipath fading channels. Over the past ten years, research has shown that power loading, where the power allocations on the OFDM frequency tones are jointly optimized, can improve error rate or capacity performance. The implementation of power loading, however, is dependent on the presence of complete forward link channel knowledge at the transmitter. In systems using frequency division duplexing (FDD), this assumption is unrealistic. In this paper, we propose power loading for OFDM symbols using a limited number of feedback bits sent from the receiver to the transmitter. The power loading vector is designed at the receiver, which is assumed to have perfect knowledge of the forward link channel, and conveyed back to the transmitter over a limited rate feedback channel. To allow for the vector to be represented by a small number of bits, the power loading vector is restricted to lie in a finite set, or codebook, of power loading vectors. This codebook is designed offline and known a priori to both the transmitter and receiver. We present two power allocation selection algorithms that optimize the probability of symbol error and capacity, respectively. Simulation results show that the proposed limited feedback techniques provide performance close to full channel knowledge power loading." @default.
• W2169791475 created "2016-06-24" @default.
• W2169791475 creator A5001355478 @default.
• W2169791475 creator A5029812222 @default.
• W2169791475 date "2005-09-01" @default.
• W2169791475 modified "2023-10-15" @default.
• W2169791475 title "OFDM Power Loading Using Limited Feedback" @default.
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• W2169791475 doi "https://doi.org/10.1109/tvt.2005.853473" @default.
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