A New Paradigm Towards Reconfigurable Environment: Reconfigurable Distributed Antennas and Reflecting Surface

arxiv: 2604.20431 · v1 · submitted 2026-04-22 · 💻 cs.IT · math.IT

A New Paradigm Towards Reconfigurable Environment: Reconfigurable Distributed Antennas and Reflecting Surface

Jintao Wang , Pingping Zhang , Chengzhi Ma , Chengwang Ji , Zheng Shi , Guanghua Yang , Shaodan Ma This is my paper

Pith reviewed 2026-05-09 22:57 UTC · model grok-4.3

classification 💻 cs.IT math.IT

keywords RDARSreconfigurable distributed antennasreflecting surfacereconfigurable intelligent surfaceshybrid architectureintegrated communication and sensingSNR gainswireless networks

0 comments p. Extension

The pith

RDARS integrates active distributed antennas with passive reconfigurable surfaces to achieve higher SNR than conventional RIS in wireless communication and sensing.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper introduces reconfigurable distributed antennas and reflecting surface as a hybrid architecture that merges active antenna transmission with passive wave reflection. This design seeks to improve coverage, spectral efficiency, and integrated communication-sensing functions in future wireless networks while remaining cost-effective and energy-efficient. The authors demonstrate concrete SNR improvements over standard reconfigurable intelligent surfaces across representative scenarios. A sympathetic reader would care because the approach offers a practical middle path between fully active and fully passive systems for next-generation networks.

Core claim

RDARS combines distributed active antennas with reconfigurable passive reflecting surfaces to integrate active transmission and passive wave control. This hybrid mode enables enhanced coverage, improved spectral efficiency, and seamless integrated communication and sensing. In representative applications, RDARS produces clear SNR gains over conventional reconfigurable intelligent surfaces.

What carries the argument

The hybrid architecture of reconfigurable distributed antennas and reflecting surface (RDARS), which merges active antenna elements with passive reconfigurable surfaces for joint signal control.

If this is right

Improved coverage and spectral efficiency become available through the same surface deployment.
Integrated communication and sensing tasks receive native support without separate hardware.
SNR gains materialize in both communication and sensing use cases relative to passive-only surfaces.
Resource allocation must jointly optimize active power and passive phase shifts.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Network operators could deploy RDARS on existing structures with lower power draw than full active arrays.
New joint optimization algorithms will likely be required to balance active and passive contributions under power and hardware constraints.
The approach may extend naturally to multi-user scenarios where some terminals benefit from active boosting and others from passive reflection.

Load-bearing premise

The hybrid active-passive architecture can be built and deployed at practical scale, and the reported SNR gains will appear in real environments without major hidden costs or performance drops.

What would settle it

A side-by-side field test or realistic simulation in which an RDARS deployment shows no measurable SNR advantage or substantially higher implementation cost than a standard RIS of comparable size.

read the original abstract

Reconfigurable distributed antennas and reflecting surface (RDARS) has emerged as a transformative solution to address the stringent requirements of future wireless networks. By combining distributed active antennas with reconfigurable passive reflecting surfaces, RDARS integrates the advantages of both active transmission and passive wave control in a cost-effective and energy-efficient manner. This hybrid architecture enables enhanced coverage, improved spectral efficiency, and seamless support for integrated communication and sensing. In this article, we first introduce the fundamental architecture and working principles of RDARS, followed by practical benefits and comparisons with recently proposed intelligent surface variants. We then highlight the signal-to-noise ratio (SNR) gains in representative applications of RDARS-aided communication and sensing scenarios, where RDARS demonstrates clear advantages over conventional reconfigurable intelligent surfaces. Finally, we outline key challenges related to practical implementation and resource allocation, and discuss potential research directions. With its unique hybrid mode synergy, RDARS is envisioned to play a pivotal role in shaping the evolution of next-generation intelligent communication systems.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

RDARS is a high-level sketch of a hybrid active-passive architecture that asserts SNR advantages without derivations or simulations to support them.

read the letter

RDARS is presented as a hybrid that combines distributed active antennas with passive reflecting surfaces for better coverage and efficiency in 6G systems, but the paper supports its main claims only through description rather than analysis. It introduces the basic architecture and working principles, then compares the idea to existing RIS variants and flags practical issues such as implementation costs and resource allocation. Those sections are clear and direct about what the hybrid might enable for integrated communication and sensing. The paper earns credit for framing the concept in one place and for being upfront about the open problems ahead. The soft spot is the section that claims clear SNR gains in representative scenarios. No closed-form expressions appear under standard channel models, no power or array-size comparisons are worked out, and no simulation results are shown to quantify the asserted edge over conventional surfaces. The advantages therefore stay at the level of architectural intuition. This paper is aimed at readers who track emerging reconfigurable wireless ideas and want a quick map of one possible hybrid direction. It could prompt discussion in a reading group or suggest follow-up questions on deployment, but it does not supply methods or bounds that would be cited in a technical derivation. It does not rise to the level that would justify sending it to peer review in its current form; the authors would need to add quantitative evaluation before a referee could usefully engage with the central claims.

Referee Report

1 major / 1 minor

Summary. The manuscript introduces Reconfigurable Distributed Antennas and Reflecting Surface (RDARS) as a hybrid architecture combining distributed active antennas with reconfigurable passive reflecting surfaces. It describes the fundamental architecture and working principles, outlines practical benefits and comparisons with other intelligent surface variants, qualitatively highlights SNR gains in representative RDARS-aided communication and sensing scenarios where it claims clear advantages over conventional reconfigurable intelligent surfaces (RIS), and discusses implementation challenges along with potential research directions.

Significance. If the claimed SNR improvements and architectural advantages can be rigorously validated, RDARS could offer a meaningful extension to existing RIS concepts by integrating active and passive elements for better coverage and efficiency in integrated communication-sensing systems. The paper's identification of practical challenges provides a useful starting point for future work, though the absence of quantitative analysis currently limits its technical contribution.

major comments (1)

[Abstract and applications section] Abstract and the section on representative applications: The central claim that 'RDARS demonstrates clear advantages over conventional reconfigurable intelligent surfaces' via 'highlighted' SNR gains is unsupported. No closed-form SNR derivations (e.g., under Rician fading or path-loss models), no Monte-Carlo simulations, no power-budget comparisons, and no array-size-specific numerical results are provided to substantiate the asserted gains over RIS. This is load-bearing for the paper's primary thesis.

minor comments (1)

[Abstract] The abstract introduces the acronym RDARS without an explicit expansion on first use, which could be clarified for readability.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive feedback. We agree that the central claims regarding SNR advantages require quantitative substantiation to strengthen the paper's technical contribution, and we will revise accordingly.

read point-by-point responses

Referee: [Abstract and applications section] Abstract and the section on representative applications: The central claim that 'RDARS demonstrates clear advantages over conventional reconfigurable intelligent surfaces' via 'highlighted' SNR gains is unsupported. No closed-form SNR derivations (e.g., under Rician fading or path-loss models), no Monte-Carlo simulations, no power-budget comparisons, and no array-size-specific numerical results are provided to substantiate the asserted gains over RIS. This is load-bearing for the paper's primary thesis.

Authors: We acknowledge that the current manuscript discusses SNR gains qualitatively based on the hybrid active-passive architecture without providing closed-form derivations, Monte-Carlo simulations, power-budget comparisons, or array-size-specific results. The paper's primary contribution is the introduction of the RDARS paradigm, its fundamental architecture, working principles, and high-level comparisons with other intelligent surfaces, with the SNR discussion serving as an illustrative highlight of potential benefits rather than a rigorous proof. To address this valid concern, the revised version will include a new subsection with: closed-form SNR expressions under Rician fading and path-loss models for RDARS versus RIS; Monte-Carlo simulation results; power-budget analysis; and numerical comparisons across different array sizes. This will directly support the claims and elevate the technical depth. revision: yes

Circularity Check

0 steps flagged

No circularity: conceptual overview without derivations or predictions

full rationale

The manuscript introduces the RDARS hybrid architecture, describes its working principles and benefits, and qualitatively highlights SNR advantages over RIS in communication and sensing scenarios. No equations, closed-form expressions, fitted parameters, predictions, or self-citations of uniqueness theorems appear in the provided text. The central claim rests on architectural intuition rather than any derivation chain that could reduce to its own inputs by construction. This is a standard non-finding for a high-level survey-style paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 1 invented entities

The proposal relies on standard wireless communication assumptions without introducing new free parameters, axioms, or independently evidenced entities beyond naming the hybrid system.

invented entities (1)

RDARS no independent evidence
purpose: Hybrid architecture combining distributed active antennas and reconfigurable passive reflecting surfaces
New named concept for the proposed system; no independent evidence or falsifiable prediction provided in abstract

pith-pipeline@v0.9.0 · 5486 in / 1011 out tokens · 82225 ms · 2026-05-09T22:57:49.092426+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

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Near-field channel recon- struction in sensing RIS-assisted wireless communica- tion systems[J]

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Spec- tral efficiency analysis of hybrid relay-reflecting intelli- gent surface-assisted cell-free massive MIMO systems [J]

Nguyen N T, Nguyen V D, Nguyen H V , et al. Spec- tral efficiency analysis of hybrid relay-reflecting intelli- gent surface-assisted cell-free massive MIMO systems [J]. IEEE Transactions on Wireless Communications, 2023, 22(5): 3397-3416

2023

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Reconfigurable dis- tributed antennas and reflecting surface: A new architec- ture for wireless communications[J]

Ma C, Yang X, Wang J, et al. Reconfigurable dis- tributed antennas and reflecting surface: A new architec- ture for wireless communications[J]. IEEE Transactions on Communications, 2024, 72(10): 6583-6598

2024

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Joint beamforming opti- mization and mode selection for RDARS-aided MIMO systems[J]

Wang J, Ma C, Gong S, et al. Joint beamforming opti- mization and mode selection for RDARS-aided MIMO systems[J]. IEEE Transactions on Wireless Communi- cations, 2024, 23(11): 17557-17572

2024

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Optimal design of RDARS-aided multi-user systems with low-resolution DACs[C]//2024 IEEE 25th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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RDARS empowered mas- sive MIMO system: Two-timescale transceiver design with imperfect CSI[J]

Ma C, Wang J, Yang X, et al. RDARS empowered mas- sive MIMO system: Two-timescale transceiver design with imperfect CSI[J]. IEEE Transactions on Wireless Communications, 2024, 23(12): 18806-18821

2024

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Secure communication in dynamic RDARS-driven systems[J]

Pei Z, Wang J, Zhang P, et al. Secure communication in dynamic RDARS-driven systems[J]. IEEE Wireless Communications Letters, 2025, 14(8): 2371-2375

2025

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Integrated sensing and communication with reconfigurable distributed antenna and reflecting surface: Joint beamforming and mode se- lection[J]

Zhang P, Wang J, Shao Y , et al. Integrated sensing and communication with reconfigurable distributed antenna and reflecting surface: Joint beamforming and mode se- lection[J]. IEEE Internet of Things Journal, 2025, 12 (13): 24401-24416

2025

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An enhanced distributed hybrid-active-passive reconfigurable intelligent surface assisted wireless communication system[P]

Ma S, Yang X, Ma C, et al. An enhanced distributed hybrid-active-passive reconfigurable intelligent surface assisted wireless communication system[P]. China Patent, CN119276303A, 2025-01-07

2025

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Flexible-position multi-state RIS-assisted wireless communication: Chan- nel modeling and spatial characteristic measurements[J]

Ren Y , Teng X, Zhou M, et al. Flexible-position multi-state RIS-assisted wireless communication: Chan- nel modeling and spatial characteristic measurements[J]. IEEE Journal on Selected Areas in Communications, 2025: 1-1

2025

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Massive MIMO antenna se- lection: Switching architectures, capacity bounds, and optimal antenna selection algorithms[J]

Gao Y , Vinck H, Kaiser T. Massive MIMO antenna se- lection: Switching architectures, capacity bounds, and optimal antenna selection algorithms[J]. IEEE Transac- tions on Signal Processing, 2018, 66(5): 1346-1360

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