@inproceedings{811ae63ac31a4373b5fe6e0b1197ef9e,
title = "Least-Squares Pilot Sequence Design for TDD Massive MIMO Systems under Inter-Cell Timing Misalignment",
abstract = "Pilot contamination (PC) is known as a dominant factor for the performance of time-division duplex massive MIMO systems. Most of the existing studies of PC assumed perfect inter-cell synchronization, which is too costly to achieve or even impossible in practice. In this paper, we consider the unsynchronized scenario, in which the reused pilot signals from other cells are subject to timing misalignment, and propose a method for pilot sequence design for reducing the mean square error (MSE) of the linear least squares (LS) channel estimation. An analytic MSE formula is first derived, which is a very complicated function of the pilot coefficients. To ease analysis, an upper bound on the MSE is then derived. Through minimization of this upper bound, an analytic solution is obtained. Computer simulations are used to illustrate the performance of the proposed pilot sequence.",
keywords = "Channel estimation, Least squares, Massive MIMO, Pilot contamination, Synchronization, Time-division duplex",
author = "Li, {Wen Hsuan} and Jwo-Yuh Wu and Hsu, {Chia Kang} and Li-Chun Wang",
note = "Publisher Copyright: {\textcopyright} 2018 IEEE.; 29th IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2018 ; Conference date: 09-09-2018 Through 12-09-2018",
year = "2018",
month = sep,
day = "9",
doi = "10.1109/PIMRC.2018.8580816",
language = "English",
series = "IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2018",
address = "美國",
}