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We consider joint scheduling and diversity to enhance the benefits of multiuser diversity in an orthogonal frequency-division multiple access (OFDMA) downlink system. The OFDMA spectrum is assumed to consist of resource blocks and the reduced feedback scheme consists of each user feeding back channel quality information (CQI) for only the best- resource blocks. Assuming largest...
We consider joint scheduling and diversity to enhance the benefits of multiuser diversity in a multiuser OFDMA scheduling system. The OFDMA spectrum is assumed to consist of resource blocks and the reduced feedback scheme consists of each user feeding back only the best- signal to noise ratios. Assuming maximum SNR scheduling, we develop a framework to analyze the performance of both...
The multiuser diversity gain increases with the degree and dynamic range of channel fluctuations. For a multi-antenna orthogonal frequency division multiplexing (OFDM) system operating in a channel with limited fluctuations, cyclic delay diversity (CDD) was proposed to increase frequency selectivity. This is achieved by introducing a cyclic delay between the different transmit antennas thereby increasing...
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