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We consider downlink multi-user MIMO transmission based on block-diagonalization precoding with quantized channel state information at the transmitter, obtained through limited feedback. We assume that users are equipped with excess receive antennas, i.e., the number of receive antennas is larger than the number of data streams per user, and propose a novel receive antenna combining method that maximizes...
In this paper, we consider multi-user MIMO (MU-MIMO) based on block-diagonalization (BD) precoding with limited feedback in the downlink of a cellular network. Non-codebook based MU-MIMO is already considered in LTE Advanced (LTE Rel. 10) as an important technology to improve the average cell spectral efficiency. Still, channel state information (CSI) feedback and downlink signaling are mainly designed...
In this paper, we present a linear precoder design for cognitive radio (CR) multi-user multiple-input multiple-output (MU-MIMO) downlink systems where unlicensed secondary users (SUs) can simultaneously utilize the same spectrum used by a licensed primary user (PU). Although a zero-forcing block diagonalization (ZF-BD) precoder is extended to the CR network with the PU, a transmit power boost problem...
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