Enhanced Achievable DoF Bounds for Cache-Aided MIMO Communication Systems
NaseriTehrani, Mohammad; Salehi, Mohammad Javad; Tölli, Antti (2024-10-07)
IEEE
07.10.2024
M. N. Tehrani, M. J. Salehi and A. Tölli, "Enhanced Achievable DoF Bounds for Cache-Aided MIMO Communication Systems," 2024 IEEE 25th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Lucca, Italy, 2024, pp. 61-65, doi: 10.1109/SPAWC60668.2024.10694609.
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© 2024 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202412097098
https://urn.fi/URN:NBN:fi:oulu-202412097098
Tiivistelmä
Abstract
Integrating coded caching (CC) into multiple-input multiple-output (MIMO) communications may significantly enhance the achievable degrees of freedom (DoF) of the wireless networks. In this paper, we consider a cache-aided MIMO configuration with a CC gain t, where a server with L Tx antennas communicates with K users, each with G Rx antennas. In the proposed content-aware MIMO strategy, we carefully adjust the number of users Ω and the number of parallel streams decoded by each user β served in each transmission to maximize the DoF. As a result, we achieve a DoF of maxβ,ΩΩβ, where β ≤ min G, L(Ω−1 t)/1+(Ω−t−1)(Ω−1 t). To prove the achievability of the proposed DoF bound, we provide a novel transmission strategy based on the simultaneous unicasting of multiple data streams. In this strategy, the missing data packets are scheduled such that the number of parallel streams per transmission is maximized while the decodability of all useful terms by each target user is guaranteed. Numerical simulations validate the findings, confirming the enhanced DoF and improved performance of the proposed design.
Integrating coded caching (CC) into multiple-input multiple-output (MIMO) communications may significantly enhance the achievable degrees of freedom (DoF) of the wireless networks. In this paper, we consider a cache-aided MIMO configuration with a CC gain t, where a server with L Tx antennas communicates with K users, each with G Rx antennas. In the proposed content-aware MIMO strategy, we carefully adjust the number of users Ω and the number of parallel streams decoded by each user β served in each transmission to maximize the DoF. As a result, we achieve a DoF of maxβ,ΩΩβ, where β ≤ min G, L(Ω−1 t)/1+(Ω−t−1)(Ω−1 t). To prove the achievability of the proposed DoF bound, we provide a novel transmission strategy based on the simultaneous unicasting of multiple data streams. In this strategy, the missing data packets are scheduled such that the number of parallel streams per transmission is maximized while the decodability of all useful terms by each target user is guaranteed. Numerical simulations validate the findings, confirming the enhanced DoF and improved performance of the proposed design.
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