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A novel low complexity multi-user MIMO downlink architecture has recently been proposed in literature. While this system seeks to palliate the limitation, imposed by some linear precoders in the absence of scheduling, that the total number of users' antennas be less than the number of base-station antennas, the system does not entirely null-out multi-user interference. The system was originally designed...
In this paper we consider the CQI reporting problem in MIMO downlink with adaptive switching between single user and multiuser mode and finite rate feedback. The feedback consist of channel directional information, which is the precoding weight, and channel quality information, which is a quantized value of estimated post processing SINR. The quantization of the channel directional information causes...
The paper considers precoder design for the downlink of multi-user MIMO systems where antenna array are used at both the base station and the mobile receiver. The proposed precoder does not completely eliminate multi-user interference (MUI) as previous schemes with multiple receive antennas per user, but obtains an optimum compromise between noise enhancement and MUI mitigation. Furthermore, by extracting...
We propose a two-stage precoder/equalizer to suppress intercarrier interference (ICI) and multiuser interference (MUI) in downlink multiuser OFDM with multiple transmit antennas. The first stage, non-linear Tomlinson-Harashima preceding (THP) at the base station (BS) transmitter, mitigates the effect of the spatial inter-stream interference caused by transmission from multiple transmit antennas to...
Many precoding schemes in downlink multiuser MIMO systems require perfect channel state information of all users at the transmitter, which is hard to realize in practical systems. Random beamforming scheme is a conventional method to reduce the amount of feedback. However, it only enjoys significant performance gains with a large number of users, which limits its practical application. We propose...
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