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It is crucial to have accurate channel state information at the transmit side to achieve the maximum performance in Multiple-Input Multiple-Output (MIMO) systems, especially for multi-user systems. Frequency division duplexing systems based on limited feedback facilitate this, but these techniques are reliant on carefully design codebooks that are optimized for various antenna deployment scenarios. In this paper, the authors discuss the channel model for Rotated-Dual-Polarized (RDP) antenna systems and propose an efficient way of designing practical differential codebooks for RDP scenarios.
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