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In this paper, the per-layer design for Tomlinson-Harashima precoding (THP) in the downlink of multiuser multiple-input multiple-output (MIMO) systems is investigated. In these systems, multiple antennas are located at all the transceivers, and the number of the receivers is equal to that of the transmit antennas. Based on the criterion of maximizing system sum-capacity, we propose two per-layer joint...
This paper analyzes the influence of independent identical distributed phase noise (PN) at different transmit and receive antennas on the performance of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) based communication systems. Assuming PN is not severe, we can show that the ICI of the phase noises can be separated into two additive terms, which are induced...
A novel low complexity user selection strategy was proposed for MIMO broadcast channels, where zero-forcing beamforming was considered. As the number of simultaneously supportable users at the same frequency is limited by the number of transmit and receive antennas, the base station may select a subset of users in a cell to serve. Exhaustive search for the optimal user set, however, is computationally...
In a multi-user MIMO downlink system, due to the limitation on the number of transmit antennas, we consider employing zero-forcing beamforming (ZFBF) and oblique projection beamforming (OPBF) as the spatial multiplexing strategies when there are many users to be supported simultaneously. Based on the analysis of ZFBF and OPBF, we show these various linear transmitter designs that offer low complexity...
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