Distributed vs. Centralized Precoding in Cell-Free Systems: Impact of Realistic Per-AP Power Limits
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866917312930512896 |
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| author | Jiang, Wei Schotten, Hans D. |
| author_facet | Jiang, Wei Schotten, Hans D. |
| contents | In cell-free massive MIMO, centralized precoding is {theoretically known} to {remarkably} outperform its distributed counterparts, albeit {with} high implementation complexity. However, this letter highlights a practical limitation {often overlooked:} {widely used closed-form} centralized {precoders} are typically derived under a sum-power constraint, which often demands unrealistic power allocation that exceeds hardware capabilities. {When two simple heuristics (global power scaling and local normalization) are applied to enforce the per-AP instantaneous power constraint}, the centralized performance superiority disappears, making distributed precoding {a robust option}. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_03948 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Distributed vs. Centralized Precoding in Cell-Free Systems: Impact of Realistic Per-AP Power Limits Jiang, Wei Schotten, Hans D. Information Theory Signal Processing In cell-free massive MIMO, centralized precoding is {theoretically known} to {remarkably} outperform its distributed counterparts, albeit {with} high implementation complexity. However, this letter highlights a practical limitation {often overlooked:} {widely used closed-form} centralized {precoders} are typically derived under a sum-power constraint, which often demands unrealistic power allocation that exceeds hardware capabilities. {When two simple heuristics (global power scaling and local normalization) are applied to enforce the per-AP instantaneous power constraint}, the centralized performance superiority disappears, making distributed precoding {a robust option}. |
| title | Distributed vs. Centralized Precoding in Cell-Free Systems: Impact of Realistic Per-AP Power Limits |
| topic | Information Theory Signal Processing |
| url | https://arxiv.org/abs/2603.03948 |