Reference : Multipair Two-Way DF Relaying with Cell-Free Massive MIMO
Scientific journals : Article
Engineering, computing & technology : Computer science
Computational Sciences
http://hdl.handle.net/10993/49530
Multipair Two-Way DF Relaying with Cell-Free Massive MIMO
English
PAPAZAFEIROPOULOS, ANASTASIOS K. []
KOURTESSIS, PANDELIS []
Chatzinotas, Symeon mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
SENIOR, JOHN M. []
2021
IEEE Open Journal of the Communications Society
Institute of Electrical and Electronics Engineers (IEEE)
2
423-438
Yes
2644-125X
New York
NY
[en] We consider a two-way half-duplex decode-and-forward (DF) relaying system with multiple pairs of single-antenna users assisted by a cell-free (CF) massive multiple-input multiple-output (mMIMO) architecture with multiple-antenna access points (APs). Under the practical constraint of imperfect channel state information (CSI), we derive the achievable sum spectral efficiency (SE) for a finite number of APs with maximum ratio (MR) linear processing for both reception and transmission in closed-form. Notably, the proposed CF mMIMO relaying architecture, exploiting the spatial diversity, and providing better coverage, outperforms the conventional collocated mMIMO deployment. Moreover, we shed light on the power-scaling laws maintaining a specific SE as the number of APs grows. A thorough examination of the interplay between the transmit powers per pilot symbol and user/APs takes place, and useful conclusions are extracted. Finally, differently to the common approach for power control in CF mMIMO systems, we design a power allocation scheme maximizing the sum SE.
http://hdl.handle.net/10993/49530
https://ieeexplore.ieee.org/ielx7/8782661/9309127/09360649.pdf

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