Learn More
—Multiple-input multiple-output (MIMO) precoding scheme is developed for time division duplex (TDD) systems in a multicell environment. The proposed scheme is designed to maximize the total achievable rate, and to work in the decentralized manner with only locally available channel state information (CSI) at each transmitter. We first establish and solve a(More)
—In this paper, a generalized MMSE beamforming is proposed for downlink multiple input multiple output (MIMO) systems. Unlike the conventional MMSE beamforming, cellular environments are considered where each user is randomly distributed in a cell and has the different temporal correlation of fading channel. We apply the proposed generalized MMSE(More)
We develop a realistic model for multiple-input multiple-output (MIMO) broadcast channels, where each randomly located user's average SNR depends on its distance from the transmitter. With perfect channel state information at the transmitter (CSIT), the average sum capacity is proven to scale for many users like αM 2 log K instead of M log log K, where α, M(More)
—In this paper, an efficient channel feedback scheme for downlink multiuser multiple-input-multiple-output (MU-MIMO) systems is proposed. The objective of the new feedback design is to adaptively control the feedback rate of each user, depending on the individual channel status, while the overall sum feedback rate is kept the same. The proposed channel(More)
—We investigate channel feedback optimization for network multiple-input multiple-output (MIMO) systems. We consider feedback channel selection to exploit channel asymmetry inherent to network MIMO systems and also consider feedback bit allocation which allows an unequal number of feedback bits to be allocated to users according to the selected channel(More)
This paper proposes the decentralized time slot allocation (DTSA) algorithm in dynamic TDD (D-TDD) system to support traffic asymmetry. In D-TDD systems, additional interferences are introduced when one cell is uplink (downlink) and the other cell is downlink (uplink). These kinds of interferences result in severe performance degradation of SIR, which(More)