Title :
Limited Feedback Scheme Using Constant Amplitude Codebook for Tomlinson-Harashima Precoding in Multi-User MIMO Systems
Author :
Yan, Chunlin ; Kayama, Hidetoshi
Author_Institution :
DOCOMO (Beijing) Commun. Labs. Co., Ltd., Beijing, China
Abstract :
This paper studies the constant amplitude codebook based feedback scheme for Tomlinson-Harashima Precoding (THP) in multi-user multiple-input-multiple-output (MU-MIMO) systems. Conventional THP precoding scheme uses non-constant amplitude codebook to encapsulate channel direction information as well as channel amplitude information. In this paper we first prove that channel amplitude information is not necessary in the user channel quantization for THP precoding with limited feedback, thus in the proposed scheme we can apply constant amplitude codebook for channel quantization. Because we do not waste feedback bits to represent the channel amplitude information in the codebook applied, the proposed scheme achieves better quantization accuracy leading to better sum-rate performance compared with the conventional one. Our analysis and the validity of the proposed scheme are verified by numerical simulations.
Keywords :
MIMO communication; feedback; numerical analysis; precoding; wireless channels; THP precoding scheme; Tomlinson-Harashima precoding; channel amplitude information; channel direction information encapsulation; constant amplitude codebook; limited feedback scheme; multiuser MIMO system; multiuser multiple-input-multiple-output system; nonconstant amplitude codebook; numerical simulation; sum-rate performance; user channel quantization; Interference; MIMO; Matrix decomposition; Quantization; Signal to noise ratio; Transmitting antennas;
Conference_Titel :
Communications (ICC), 2011 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-61284-232-5
Electronic_ISBN :
1550-3607
DOI :
10.1109/icc.2011.5962831