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Coordination of MIMO transmission across multiple cells can effectively reduce cell-edge interference. However, downlink multi-cell MIMO transmission requires additional channel state information at the cooperating base stations compared to the single-cell case. Therefore, reducing the feedback overhead is an important issue in multi-cell MIMO systems. This paper proposes an adaptive feedback interval...
To mitigate the sum rate ceiling problems, high-resolution quantization and feedback schemes for the channel state information (CSI) are highly demanded in multi-user (MU) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In this paper, we investigate three adaptive codebook-based limited feedback techniques for MU-MIMO-OFDM broadcast systems. Using the...
A MIMO diversity scheme that utilizes varying amounts of channel state information (CSI) for mobile users is presented. CSI at the transmitter is obtained through a time-duplexed feedback channel, and thus by varying the periodicity of feedback intervals, an optimal balance is struck between obtaining accurate CSI and minimizing the overhead of uplink transmission. The optimal feedback amount is shown...
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