Task-Based Quantizer for CSI Feedback in Multi-User MISO VLC/RF Systems Article Swipe
Fugui He
,
Congcong Wang
,
Yao Nie
,
Xianglin Fan
,
Chensitian Zhang
,
Yang Yang
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/electronics14112277
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/electronics14112277
The performance of multiple-input single-output (MISO) transmission is highly dependent on the accuracy of the channel state information (CSI) at the base station (BS), which necessitates precise CSI estimation and reliable feedback from the user equipment. However, the overhead of the CSI feedback occupies substantial uplink bandwidth resources. To alleviate the overhead, this paper proposes a novel task-based quantizer for uplink MISO visible light communication (VLC) systems. In particular, a hybrid radio frequency (RF)/VLC system is considered, where VLC links are mainly used for large-volume downlink transmissions and RF links are used for uplink CSI feedback. Since the RF bandwidth resources are limited, the CSI is quantified to reduce the uplink resource requirements, which, however, inevitably causes CSI estimation errors at the BS. To guarantee the CSI estimation accuracy while minimizing the RF resource cost, a task-based quantization scheme for channel estimation (TQ-CE) is proposed. In the TQ-CE, both the quantized codebook and the post-processing matrix are optimized to minimize the mean square error (MSE) of the channel estimation. Taking the minimum MSE as the target task, the TQ-CE leverages vector quantization (VQ) to generate a codebook, which is designed to reduce the feedback overhead without compromising the precision of the channel estimation. Then, an optimal closed-form solution of the post-processing matrix is derived based on the minimum mean square error (MMSE) criterion. The simulation results demonstrate that the proposed TQ-CE achieved 0.25Mbit/s and 0.62Mbit/s higher data rates compared with the conventional scalar quantization-based channel estimation (SQ-CE) schemes and vector quantization-based channel estimation (VQ-CE) schemes, respectively. Moreover, in terms of the feedback overhead, compared with the 18-bit SQ-CE, the 4-bit TQ-CE achieved a 22.2% reduction in uplink bits.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3390/electronics14112277
- https://www.mdpi.com/2079-9292/14/11/2277/pdf?version=1748947934
- OA Status
- gold
- References
- 44
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4410997534
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4410997534Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3390/electronics14112277Digital Object Identifier
- Title
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Task-Based Quantizer for CSI Feedback in Multi-User MISO VLC/RF SystemsWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
-
2025Year of publication
- Publication date
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2025-06-03Full publication date if available
- Authors
-
Fugui He, Congcong Wang, Yao Nie, Xianglin Fan, Chensitian Zhang, Yang YangList of authors in order
- Landing page
-
https://doi.org/10.3390/electronics14112277Publisher landing page
- PDF URL
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https://www.mdpi.com/2079-9292/14/11/2277/pdf?version=1748947934Direct link to full text PDF
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
- OA URL
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https://www.mdpi.com/2079-9292/14/11/2277/pdf?version=1748947934Direct OA link when available
- Concepts
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Task (project management), Computer science, Visible light communication, Electronic engineering, Real-time computing, Engineering, Electrical engineering, Systems engineering, Light-emitting diodeTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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10Other works algorithmically related by OpenAlex
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| primary_location.license | cc-by |
| primary_location.pdf_url | https://www.mdpi.com/2079-9292/14/11/2277/pdf?version=1748947934 |
| primary_location.version | publishedVersion |
| primary_location.raw_type | journal-article |
| primary_location.license_id | https://openalex.org/licenses/cc-by |
| primary_location.is_accepted | True |
| primary_location.is_published | True |
| primary_location.raw_source_name | Electronics |
| primary_location.landing_page_url | https://doi.org/10.3390/electronics14112277 |
| publication_date | 2025-06-03 |
| publication_year | 2025 |
| referenced_works | https://openalex.org/W3108314304, https://openalex.org/W1649136331, https://openalex.org/W3025061635, https://openalex.org/W4286374925, https://openalex.org/W3200509761, https://openalex.org/W3152891870, https://openalex.org/W4293812011, https://openalex.org/W3037818400, https://openalex.org/W4285217109, https://openalex.org/W3045932802, https://openalex.org/W3182309252, https://openalex.org/W4319866450, https://openalex.org/W4408452795, https://openalex.org/W3074572758, https://openalex.org/W4221143069, https://openalex.org/W4409223197, https://openalex.org/W4399768035, https://openalex.org/W2803549871, https://openalex.org/W3048582106, https://openalex.org/W3045865620, https://openalex.org/W2157276749, https://openalex.org/W2132049438, https://openalex.org/W2104689973, https://openalex.org/W4401386934, https://openalex.org/W4310153932, https://openalex.org/W2113158412, https://openalex.org/W4224988694, https://openalex.org/W4367016247, https://openalex.org/W4407007412, https://openalex.org/W2089622953, https://openalex.org/W3162996531, https://openalex.org/W4285217677, https://openalex.org/W4226278557, https://openalex.org/W2422351375, https://openalex.org/W6853751573, https://openalex.org/W2917759050, https://openalex.org/W2181750318, https://openalex.org/W3111980777, https://openalex.org/W2475781058, https://openalex.org/W2755091861, https://openalex.org/W2145287259, https://openalex.org/W3106866071, https://openalex.org/W2144523130, https://openalex.org/W4379409085 |
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