Robust Non-linear Precoder for Multiuser MISO Systems Based on Delay and Channel Quantization

In multiuser multiple-input single-output (MISO) systems, non-linear precoder is able to achieve the theoretical sum capacity of downlink channel with perfect channel state information (CSI). However, the perfect CSI is not available at the transmitter in practical system, especially in frequency di...

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Bibliographic Details
Published in:Wireless personal communications Vol. 72; no. 4; pp. 1993 - 2014
Main Authors: Sun, Yanzhi, Wu, Muqing, Guo, Qilin, Zheng, Feng, Xu, Chunxiu
Format: Journal Article
Language:English
Published: Boston Springer US 01.10.2013
Springer
Subjects:
Algorithmics. Computability. Computer arithmetics
Algorithms
Applied sciences
Communications Engineering
Computer Communication Networks
Computer science; control theory; systems
Engineering
Equipments and installations
Exact sciences and technology
Mobile radiocommunication systems
Networks
Radiocommunications
Signal,Image and Speech Processing
Telecommunications
Telecommunications and information theory
Theoretical computing
Robust non-linear precoder
Channel quantization
Tomlinson–Harashima precoding (THP)
Multi-user multiple-input single-output (MISO)
Delay
Multiple access
Input output
Quantization error
Cellular radio
Permutation
Transmission channel
Downlink
Minimization
Computational complexity
Duplex
Mean square error
Precoding
Tomlinson-Harashima precoding (THP)
Cholesky method
Signal quantization
Channel estimation
Defect
Wireless network
Cholesky factorization
ISSN:0929-6212, 1572-834X
Online Access:Get full text
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Summary:In multiuser multiple-input single-output (MISO) systems, non-linear precoder is able to achieve the theoretical sum capacity of downlink channel with perfect channel state information (CSI). However, the perfect CSI is not available at the transmitter in practical system, especially in frequency division duplex (FDD) system where the imperfect CSI is the delayed, quantized channel direction information relayed back from the receiver through a dedicated feedback channel. So the performance of conventional non-linear precoder degrades significantly. In this paper, a robust non-linear Tomlinson–Harashima precoding (THP) based on sum mean squared error (SMSE) minimization for the downlink of multiuser MISO FDD systems is proposed. The proposed precoder is robust to the channel uncertainties arising from channel delay and quantization error. Furthermore, an improved non-linear THP with channel magnitude information (CMI) consideration is introduced to compensate the instantaneous CMI shortage at the transmitter. Additionally, the computational complexity of both proposed precoders can be reduced remarkably by Cholesky factorization with symmetric permutation. Simulation results demonstrate the improvement in bit error ratio performance and illustrate the SMSE performance of the proposed algorithms compared with conventional THP with perfect CSI in the literature.
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ISSN:0929-6212
1572-834X
DOI:10.1007/s11277-013-1117-9