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Overview: In this white paper published by University of Texas they propose to exploit channel coherence to send back only a fraction of the beamforming vectors. The coherence of the transmit beamforming vectors is established. A new spherical interpolator, with an additional parameter for phase rotation, is proposed to fill in the gaps between known vectors. The parameters of the interpolator are optimized in the sense of maximizing mutual information and are sent back to the transmitter along with the beamforming vectors through the feedback channel.
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