Limited Feedback Scheme for Tomlinson-Harashima Precoding in Close-Loop MIMO Systems

Author

Chen Runqian ; Wu Muqing ; Zheng Feng ; Lu Guoxian

Author_Institution

Lab. of Network Syst. Archit. & Convergence, Beijing Univ. of Posts & Telecommun., Beijing, China

fYear

2012

fDate

21-23 Sept. 2012

Firstpage

1

Lastpage

5

Abstract

In this paper, a novel limited feedback scheme, based on scalar quantization, is proposed for Tomlinson-Harashima precoding (THP) in multi-user multiple-input multiple-output (MU-MIMO) systems. Due to the sensitivity of THP to erroneous channel state information (CSI), the conventional codebook-based channel vector quantization (CVQ) is no longer suitable since its complexity grows exponentially with the increase of feedback bits. This paper combines the optimum Gaussian scalar quantization (GSQ) with THP to improve the accuracy of CSI for the flat Rayleigh fading channel. Simulation results show that the GSQ-THP scheme provides a very high capacity and a good bit error rate (BER) performance.

Keywords

Gaussian processes; MIMO communication; Rayleigh channels; error statistics; precoding; vector quantisation; BER performance; CSI accuracy; CVQ; GSQ-THP scheme; MU-MIMO systems; THP sensitivity; Tomlinson-Harashima precoding; bit error rate; close-loop MIMO systems; conventional codebook-based channel vector quantization; erroneous channel state information; feedback bits; flat Rayleigh fading channel; limited feedback scheme; multiuser multiple-input multiple-output systems; optimum GSQ; optimum Gaussian scalar quantization; Bit error rate; Complexity theory; Interference; MIMO; Quantization; Signal to noise ratio; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2012 8th International Conference on

Conference_Location

Shanghai

ISSN

2161-9646

Print_ISBN

978-1-61284-684-2

Type

conf

DOI

10.1109/WiCOM.2012.6478561

Filename

6478561