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

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 pot...

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Bibliographic Details
Published in:KSII transactions on Internet and information systems 2018-11, Vol.12 (11), p.5304-5322
Main Authors: Jin, Jin, Gao, Xiang-Chuan, Li, Xingwang, Cavalcante, Charles Casimiro, Li, Lihua
Format: Article
Language:Korean
Subjects:
channel state information
feedback topology
Interference alignment
interference channel
multiple-input-multiple-output
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Summary: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.
ISSN:1976-7277
1976-7277