Integrated Localization and Communication in Cell-Free Massive MIMO with Zero Over-the-Air Communication Overhead

In user-centric cell-free massive MIMO systems, a large number of low-complexity access points jointly serves a smaller number of mobile stations in the same communication bandwidth. Employing time division duplex mode and exploiting uplink/downlink channel reciprocity, the phases of uplink training...

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Bibliographic Details
Main Authors: Herfeh, Mahdi Shakiba, Kamoun, Mohamed, Chu, Yun Yaw, Buzzi, Stefano
Format: Conference Proceeding
Language:English
Subjects:
Cell-Free massive MIMO
channel estimation
Costs
Estimation error
integrated localization and communication
Location awareness
millimeter wave
Partial transmit sequences
Power control
Training
user localization
user-centric
Wireless networks
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Summary:In user-centric cell-free massive MIMO systems, a large number of low-complexity access points jointly serves a smaller number of mobile stations in the same communication bandwidth. Employing time division duplex mode and exploiting uplink/downlink channel reciprocity, the phases of uplink training and uplink/downlink data transmission sequentially take place within each channel coherence interval. This paper tackles the problem of integrated localization and communication in user-centric cell-free massive MIMO systems and proposes using the uplink decoded data as an additional virtual pilot to improve location and channel estimation for the mobile stations. In particular, after the usual training phase and uplink data transmission, the central processing unit shares the decoded uplink data with the access points, that use it as a long virtual pilot to refine the estimate of the users' locations. Extensive computer simulation results show the effectiveness of the proposed approach in the operating region of large Signal-to-Interference plus Noise Ratios.
ISSN:1558-2612
DOI:10.1109/WCNC57260.2024.10570734