Trade-Offs in Decentralized Multi-Antenna Architectures : Sparse Combining Modules for WAX Decomposition
Vidal Alegría, Juan LU
and Rusek, Fredrik
LU
(2023)
In IEEE Transactions on Signal Processing
71.
p.2879-2894
- Abstract
With the increase in the number of antennas at base stations (BSs), centralized multi-antenna architectures have encountered scalability problems from excessive interconnection bandwidth to the central processing unit (CPU), as well as increased processing complexity. Thus, research efforts have been directed towards finding decentralized receiver architectures where a part of the processing is performed at the antenna end (or close to it). A recent paper put forth an information-lossless trade-off between level of decentralization (inputs to CPU) and decentralized processing complexity (multiplications per antenna). This trade-off was obtained by studying a newly defined matrix decomposition-the WAX decomposition-which is directly... (More)
With the increase in the number of antennas at base stations (BSs), centralized multi-antenna architectures have encountered scalability problems from excessive interconnection bandwidth to the central processing unit (CPU), as well as increased processing complexity. Thus, research efforts have been directed towards finding decentralized receiver architectures where a part of the processing is performed at the antenna end (or close to it). A recent paper put forth an information-lossless trade-off between level of decentralization (inputs to CPU) and decentralized processing complexity (multiplications per antenna). This trade-off was obtained by studying a newly defined matrix decomposition-the WAX decomposition-which is directly related to the information-lossless processing that should to be applied in a general framework to exploit the trade-off. The general framework consists of three stages: a set of decentralized filters, a linear combining module, and a processing matrix applied at the CPU; these three stages are linear transformations which can be identified with the three constituent matrices of the WAX decomposition. The previous work was unable to provide explicit constructions for linear combining modules which are valid for WAX decomposition, while it remarked the importance of these modules being sparse with 1s and 0s so they could be efficiently implemented using hardware accelerators. In this work we present a number of constructions, as well as possible variations of them, for effectively defining linear combining modules which can be used in the WAX decomposition. Furthermore, we show how these structures facilitate decentralized calculation of the WAX decomposition for applying information-lossless processing in architectures with an arbitrary level of decentralization.
(Less)
- author
- Vidal Alegría, Juan
LU
and Rusek, Fredrik
LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- decentralized processing, linear equalization, LIS, Massive MIMO, matched filter, MIMO, WAX decomposition
- in
- IEEE Transactions on Signal Processing
- volume
- 71
- pages
- 16 pages
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- scopus:85167817935
- ISSN
- 1053-587X
- DOI
- 10.1109/TSP.2023.3302939
- language
- English
- LU publication?
- yes
- id
- f13c1040-e371-4cef-907b-f4ea6949b911
- date added to LUP
- 2024-01-12 14:23:10
- date last changed
- 2024-01-12 14:25:10
@article{f13c1040-e371-4cef-907b-f4ea6949b911,
abstract = {{<p>With the increase in the number of antennas at base stations (BSs), centralized multi-antenna architectures have encountered scalability problems from excessive interconnection bandwidth to the central processing unit (CPU), as well as increased processing complexity. Thus, research efforts have been directed towards finding decentralized receiver architectures where a part of the processing is performed at the antenna end (or close to it). A recent paper put forth an information-lossless trade-off between level of decentralization (inputs to CPU) and decentralized processing complexity (multiplications per antenna). This trade-off was obtained by studying a newly defined matrix decomposition-the WAX decomposition-which is directly related to the information-lossless processing that should to be applied in a general framework to exploit the trade-off. The general framework consists of three stages: a set of decentralized filters, a linear combining module, and a processing matrix applied at the CPU; these three stages are linear transformations which can be identified with the three constituent matrices of the WAX decomposition. The previous work was unable to provide explicit constructions for linear combining modules which are valid for WAX decomposition, while it remarked the importance of these modules being sparse with 1s and 0s so they could be efficiently implemented using hardware accelerators. In this work we present a number of constructions, as well as possible variations of them, for effectively defining linear combining modules which can be used in the WAX decomposition. Furthermore, we show how these structures facilitate decentralized calculation of the WAX decomposition for applying information-lossless processing in architectures with an arbitrary level of decentralization.</p>}},
author = {{Vidal Alegría, Juan and Rusek, Fredrik}},
issn = {{1053-587X}},
keywords = {{decentralized processing; linear equalization; LIS; Massive MIMO; matched filter; MIMO; WAX decomposition}},
language = {{eng}},
pages = {{2879--2894}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
series = {{IEEE Transactions on Signal Processing}},
title = {{Trade-Offs in Decentralized Multi-Antenna Architectures : Sparse Combining Modules for WAX Decomposition}},
url = {{http://dx.doi.org/10.1109/TSP.2023.3302939}},
doi = {{10.1109/TSP.2023.3302939}},
volume = {{71}},
year = {{2023}},
}