Low-Overhead Feedback Topology Design for the K-User MIMO Interference Alignment

Abstract

Since designing a feedback topology is a practical way to implement interference alignment at reduced cost of channel state information (CSI) feedback, six feedback topologies have been presented in prior works for a K-user multiple-input multiple-output interference channel. To fully reveal the potential benefits of the feedback topology in terms of the saving of CSI overhead, we propose a new feedback topology in this paper. By efficiently performing dimensionality-decreasing at the transmitter side and aligning interference signals at a subset of receivers, we show that the proposed feedback topology obtains substantial reduction of feedback cost over the existing six feedback designs under the same antenna configuration. . He has several papers published in journal and conferences, has authored several patents and he has worked on several funded research projects on the wireless communications areas. His research interests include MIMO communication, cooperative communication, hardware constrained communication, non-orthogonal multiple access (NOMA), physical layer security, FSO communications, and performance analysis of fading channels.