Feedback granularity control for multiuser MIMO-OFDMA systems

Author

Kim, Hyun-Myung ; Min, Moonsik ; Im, Gi-Hong

Author_Institution

Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Kyungbuk, 790-784, South Korea

fYear

2013

fDate

7-10 April 2013

Firstpage

3051

Lastpage

3055

Abstract

In this paper, we propose a feedback granularity control scheme for multiuser multiple-input multiple-output orthogonal frequency-division multiple access (MIMO-OFDMA) systems. The proposed scheme resizes the unit and the resolution of the feedback to efficiently exploit channel correlations in both the time and the frequency domains. Two types (centralized and distributed) of granularity search methods are proposed, and their performance characteristics over practical wireless channels are investigated. Simulation results show that the proposed schemes (particularly the distributed method) effectively calculate the optimal granularity, and thus significantly improve the sum-rate of multiuser MIMO-OFDMA systems.

Keywords

Base stations; Correlation; Delays; MIMO; OFDM; Optimization; Wireless communication; correlated channel; limited feedback; multiuser multiple-input multiple-output (MU-MIMO); orthogonal frequency-division multiple-access (OFDMA);

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference (WCNC), 2013 IEEE

Conference_Location

Shanghai, Shanghai, China

ISSN

1525-3511

Print_ISBN

978-1-4673-5938-2

Electronic_ISBN

1525-3511

Type

conf

DOI

10.1109/WCNC.2013.6555048

Filename

6555048