Title :
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
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;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing (WiCOM), 2012 8th International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-61284-684-2
DOI :
10.1109/WiCOM.2012.6478561
