Design of Pilots and Power Control in the Cell-Free Massive MIMO Uplink

Trang Mai, Hien-Quoc Ngo, Le-Nam Tran

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper considers the uplink of cell-free massive
MIMO (CFM-MIMO) with the matched-filtering technique
used at each access point. Imperfect channel information, nonorthogonal
pilot sequences, and data power control are taken
into account. To reduce the effect of pilot contamination (and
hence, improve the system performance), we propose a joint
pilot design and data power control algorithm which selects pilot
sequences and data power coefficients to maximize the minimum
rate of all users. The proposed algorithm is based on first-order
optimization method, and thus, its computational complexity
scales favorably with the system size. The considered system
model and the proposed design can be applied to any CFMMIMO
systems regardless of the length of pilot sequence and
the number of users. Numerical results show that our proposed
method outperforms the conventional greedy pilot assignment
combined with data power control.
Original languageEnglish
Title of host publicationThe Asilomar Conference on Signals, Systems, and Computers
Publication statusPublished - 2020

Publication series

NameAsilomar Conference on Signals, Systems, and Computers: Proceedings
ISSN (Electronic)2576-2303

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