[2205.00333] Opportunistic AP Selection in Cell-Free Massive MIMO-OFDM Systems
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Computer Science > Information Theory

arXiv:2205.00333 (cs)
[Submitted on 30 Apr 2022]

Title:Opportunistic AP Selection in Cell-Free Massive MIMO-OFDM Systems

Authors:Wei Jiang, Hans D. Schotten
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Abstract:Exploiting the degree of freedom in the frequency domain and the near-far effect among different access points (APs), this paper proposes an opportunistic transmission scheme in cell-free massive MIMO-OFDM systems. The key idea is to orthogonally assign subcarriers among different users, so that there is only one user on each subcarrier. Then, a user is only served by its near APs through opportunistic selection, while the far APs are deactivated to avoid wasting power over their channels with severe propagation losses. Moreover, the number of active APs per subcarrier becomes small due to the opportunistic selection, making the use of downlink pilots and coherent detection feasible. As corroborated by numerical results, the proposed scheme can bring a significant performance boost in terms of both power efficiency and spectral efficiency.
Comments: 2022 IEEE 95th Vehicular Technology Conference (VTC2022-Spring)
Subjects: Information Theory (cs.IT); Signal Processing (eess.SP)
Cite as: arXiv:2205.00333 [cs.IT]
  (or arXiv:2205.00333v1 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.2205.00333

Submission history

From: Wei Jiang [view email]
[v1] Sat, 30 Apr 2022 19:43:43 UTC (462 KB)
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