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

• Jin Jin,
• Xiang-Chuan Gao,
• Xingwang Li,
• Charles C. Cavalcante,
• Lihua Li,

Vol. 12, No. 11, November 29, 2018
10.3837/tiis.2018.11.008, Download Paper (Free):

• interference alignment
• Channel state information
• feedback topology
• Interference channel
• multiple-input-multiple-output

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.

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