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Reckon for the considerable beamforming gain, eigen-based beamforming (EBB) has been proved to be a promising case to ensure cell edge link robustness. For simplicity, both spatial multiplexing gain and beamforming gain can be obtained with conventional rank adaptive EBB scheme, however, former researches suggest that it doesn't work well at cell edge region. A novel ACK/NAK aided rank adaptive algorithm...
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