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On Achievable Multiplexing Gain of BD in MIMO Broadcast Channels With Limited Feedback SCIE SCOPUS

Title
On Achievable Multiplexing Gain of BD in MIMO Broadcast Channels With Limited Feedback
Authors
Min, MoonsikJEON, YO SEBIm, Gi-Hong
Date Issued
2016-02
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract
To maintain a specific degree of multiplexing gain with limited feedback in multiple-input/multiple-output broadcast channels, the number of feedback bits has been increased linearly with the signal-to-noise ratio (SNR) measured in decibel, and conditions for the slope of this increase have been derived in previous studies. However, previous studies mostly focused on the chordal distance (ChD) for channel quantization, although it is not an optimally designed distance measure. Thus, the possibility exists that the same degree of multiplexing gain can be obtained by using fewer feedback bits than the existing method requires. In this paper, we propose an optimal distance measure that can maximize the multiplexing gain achieved by limited-feedback-based block diagonalization over broadcast channels. Then, we provide a sufficient condition for the number of feedback bits to achieve a specific degree of multiplexing gain with the proposed method. The sufficient number of feedback bits is given by a linear function of the SNR (decibel) as in previous studies, but the slope of the linear increase can be much less than that obtained in previous studies. As a consequence, the proposed method achieves higher multiplexing gain and corresponding throughput than the existing methods with the same number of feedback bits.
URI
https://oasis.postech.ac.kr/handle/2014.oak/95024
DOI
10.1109/TWC.2015.2480069
ISSN
1536-1276
Article Type
Article
Citation
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, vol. 15, no. 2, page. 871 - 885, 2016-02
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임기홍IM, GI HONG
Dept of Electrical Enginrg
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