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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...
The combination of relay and Multiple-Input Multiple-Output (MIMO) techniques can significantly benefit the signal transmission in cellular networks. In this work, we propose a novel relaying scheme for the relay assisted MIMO broadcast channel including user classification and preceding. The users are firstly classified as Direct Link (DL) users and Relay Link (RL) users according to their channel...
In this paper we study a MIMO fading broadcast channel where each receiver has perfect channel state information (CSI) while the transmitter only acquires quantized CSI by finite rate feedback. We analyze the zero-forcing dirty-paper coding (ZF-DPC) scheme, which is a nonlinear preceding scheme inherently superior to linear ZF beamforming. Lower bound in closed-form expression and upper bound on the...
In this paper, we propose a limited-feedback preceding scheme, successive and dynamic per-user rate control (SD- PURC), in the multiuser multiple-input multiple-output (MIMO) downlink systems. This scheme is characterized by the successive process of scheduling and the dynamic adjustment of correlation parameters with regard to a set of non-orthogonal precoding vectors. Simulation results indicate...
Using the duality of multiple input multiple output broadcast (MIMO BC) and MIMO multiple access (MIMO MAC), a lower bound and an upper bound of mutual information of MIMO BC systems with imperfect channel estimation are investigated. The gap between two bounds is considerably tight especially at high SNR region. The point-to-point MIMO system is a special case of our results. In the limit where the...
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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