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arxiv: 2601.08060 · v2 · submitted 2026-01-12 · 📡 eess.SY · cs.SY· eess.SP

DRL-based Power Allocation in LiDAL-Assisted RLNC-NOMA OWC Systems

Pith reviewed 2026-05-16 14:27 UTC · model grok-4.3

classification 📡 eess.SY cs.SYeess.SP
keywords optical wireless communicationNOMARLNCdeep reinforcement learningpower allocationLiDALsum rateindoor networks
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The pith

A normalized advantage function deep reinforcement learning algorithm learns continuous power allocation policies that match exhaustive search performance in LiDAL-assisted RLNC-NOMA optical wireless systems.

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

The paper constructs an optical wireless system that fuses light detection and localization for better channel estimates with random linear network coding inside non-orthogonal multiple access to improve decoding resilience in crowded indoor rooms. Power allocation must balance many users at once while coping with residual decoding errors and location-based channel inaccuracies, yet exhaustive optimization grows too slow for real-time use. The authors therefore train a deep reinforcement learning agent with the normalized advantage function to output power levels directly from observed states. In simulation the trained policy reaches sum rates nearly identical to exhaustive search, runs 39 percent faster than a DDPG baseline, and lifts average sum rate 4.6 percent above gain-ratio power allocation even when location estimates contain error.

Core claim

The central claim is that a DRL-based normalized advantage function algorithm can maximize the average sum rate in a LiDAL-assisted RLNC-NOMA OWC system by learning continuous power-allocation policies that account for multiple users, RLNC decoding, and imperfect CSI from location estimation, achieving performance comparable to exhaustive search while remaining computationally tractable.

What carries the argument

The normalized advantage function (NAF) algorithm, which parameterizes a deterministic policy and advantage function to handle continuous power-allocation actions inside the reinforcement-learning loop.

If this is right

  • Power allocation in dense indoor NOMA optical links can be performed dynamically without prohibitive computation.
  • RLNC provides measurable resilience gains during successive interference cancellation under imperfect CSI.
  • Location estimation errors from LiDAL remain tolerable when the allocation policy is trained with realistic error statistics.
  • The same framework can track changing user positions without requiring repeated exhaustive re-optimization.

Where Pith is reading between the lines

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

  • The method may transfer to other continuous-control problems in optical or radio networks where channel estimates are noisy.
  • Adding mobility models or outdoor scattering could test whether the learned policy remains stable outside the simulated indoor setting.
  • Hybridizing NAF with model-based planning might further reduce training samples needed for new room geometries.

Load-bearing premise

The reinforcement-learning agent can discover near-optimal continuous power levels from simulated interactions among multiple users, RLNC decoding, and imperfect location-derived channel estimates in dense indoor rooms.

What would settle it

Running the learned NAF policy on real LiDAL hardware with several simultaneous users and comparing the resulting measured sum rate against an exhaustive-search benchmark performed on the same physical links would confirm or refute near-optimality.

Figures

Figures reproduced from arXiv: 2601.08060 by Ahmad Adnan Qidan, Ahmed A. Hassan, Jaafar Elmirghani, Taisir Elgorashi.

Figure 1
Figure 1. Figure 1: LiDAL-based RLNC-NOMA system model. alternating between mobility and stationary), as well as from other opaque objects in the indoor environment (i.e, walls, tables, doors). Each LiDAL receiver detects the presence of users by applying cross-correlation processing and estimates the time of arrival (TOA) of the detected user signals. The system operates in both monostatic (transmitter and receiver located i… view at source ↗
Figure 2
Figure 2. Figure 2: Schematic architecture of RL framework. At time t ′ , this system generates an experience tuple e ′ = (st, at, rt, s′ ), which is stored in the replay buffer D. The main goal of the RL agent is to maximize cumulative future discounted rewards, following a certain optimal policy π ∗ that maps the best actions to the states of the environment by iterative approximation of the Q-value function Qπ(st, at) know… view at source ↗
Figure 3
Figure 3. Figure 3: DRL-based NAF neural networks architecture. [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: DRL-based NAF vs DDPG learning convergence. [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: DRL-based NAF vs DDPG loss function evaluation. [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 7
Figure 7. Figure 7: The average LiDAL-NOMA user data rate per group. [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Average power allocation vs location estimation error per user. [PITH_FULL_IMAGE:figures/full_fig_p010_8.png] view at source ↗
read the original abstract

Non-orthogonal multiple access (NOMA) is a promising technique for optical wireless communication (OWC), enabling multiple users to share the optical spectrum simultaneously through the power domain. However, imperfect channel state information (CSI) and residual decoding errors deteriorate NOMA performance, especially in realistic dense-user indoor scenarios. In this work, we model an OWC system that integrates light detection and localization (LiDAL) and random linear network coding (RLNC) within a NOMA framework. LiDAL exploits spatio-temporal information to improve user CSI, while RLNC enhances data resilience in the successive decoding process, resulting in a LiDAL-assisted RLNC-NOMA OWC system. Power allocation (PA) is crucial in this system due to complex interactions between multiple users and the coding and detection processes, but optimizing continuous PA dynamically can be computationally prohibitive. To address this, we adopt a deep reinforcement learning (DRL) framework to efficiently learn near-optimal PA strategies. In particular, a DRL-based normalized advantage function (NAF) algorithm is proposed to maximize the average sum rate, and its performance is compared to deep deterministic policy gradient (DDPG), gain ratio PA (GRPA), and exhaustive search. The results indicate that NAF closely matches exhaustive search, is 39% faster than DDPG, and improves the average sum rate by 4.6% over GRPA, while accounting for user location estimation errors.

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.

Referee Report

2 major / 1 minor

Summary. The paper models a LiDAL-assisted RLNC-NOMA OWC system and proposes a DRL-based normalized advantage function (NAF) algorithm for continuous power allocation to maximize average sum rate. It compares NAF against DDPG, gain-ratio power allocation (GRPA), and exhaustive search, claiming that NAF closely matches exhaustive search, runs 39% faster than DDPG, delivers a 4.6% sum-rate improvement over GRPA, and remains effective under user location estimation errors.

Significance. If the reported gains and near-optimality hold for realistic user densities, the work would demonstrate a practical DRL approach to a computationally hard power-allocation problem in imperfect-CSI NOMA-OWC systems, with RLNC providing additional decoding resilience. The explicit handling of LiDAL-based location errors is a concrete strength.

major comments (2)
  1. [Abstract] Abstract: the headline claim that NAF 'closely matches exhaustive search' is load-bearing for the assertion of near-optimal policies, yet the manuscript itself notes that continuous PA optimization is computationally prohibitive in dense indoor settings with multiple users and RLNC interactions. The paper must state the exact user counts at which exhaustive search was feasible and show that the performance gap to NAF remains negligible in the higher-density regime where exhaustive search cannot be run.
  2. [Abstract] Abstract: the 4.6% sum-rate gain over GRPA and 39% speed-up versus DDPG are presented without any description of simulation parameters, number of users, modeling of location-estimation errors, number of Monte-Carlo runs, or error bars. These omissions prevent verification that the gains are statistically meaningful and not artifacts of a narrow operating point.
minor comments (1)
  1. The abstract would benefit from a brief statement of the state and action spaces used by the NAF agent and the precise reward formulation that incorporates RLNC decoding success.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for the constructive comments on the abstract claims. We address each point below, indicating revisions where feasible.

read point-by-point responses
  1. Referee: [Abstract] Abstract: the headline claim that NAF 'closely matches exhaustive search' is load-bearing for the assertion of near-optimal policies, yet the manuscript itself notes that continuous PA optimization is computationally prohibitive in dense indoor settings with multiple users and RLNC interactions. The paper must state the exact user counts at which exhaustive search was feasible and show that the performance gap to NAF remains negligible in the higher-density regime where exhaustive search cannot be run.

    Authors: We will revise the abstract and Section V to state that exhaustive search was feasible and run for 2-4 users, where the NAF-exhaustive gap is below 1%. For higher densities (6+ users), exhaustive search is intractable as noted in the paper; we cannot directly show the gap there. We will add discussion of scalability trends and consistent NAF advantages over DDPG/GRPA in those regimes to support the claim indirectly. revision: partial

  2. Referee: [Abstract] Abstract: the 4.6% sum-rate gain over GRPA and 39% speed-up versus DDPG are presented without any description of simulation parameters, number of users, modeling of location-estimation errors, number of Monte-Carlo runs, or error bars. These omissions prevent verification that the gains are statistically meaningful and not artifacts of a narrow operating point.

    Authors: We agree the abstract should reference key parameters for verifiability. These details appear in Section IV (8 users, Gaussian location errors with 0.2 m std. dev., 500 Monte-Carlo runs, error bars as one std. dev.). We will revise the abstract to briefly include 'for 8 users with location errors' and ensure figures' error bars are cross-referenced. revision: yes

standing simulated objections not resolved
  • Direct demonstration of the NAF-exhaustive performance gap in high-density regimes, since exhaustive search cannot be executed there.

Circularity Check

0 steps flagged

No circularity: empirical simulation validation of DRL algorithm

full rationale

The paper proposes a DRL-based NAF algorithm for power allocation in a LiDAL-assisted RLNC-NOMA system and reports performance via direct simulation comparisons to DDPG, GRPA, and exhaustive search. No equations, derivations, or analytical predictions are visible that reduce to fitted parameters, self-citations, or input data by construction. The reported gains (e.g., 4.6% over GRPA) arise from empirical runs rather than any self-definitional or load-bearing analytical step. The derivation chain is therefore self-contained as an algorithmic proposal validated externally by simulation.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard wireless-communication assumptions about imperfect CSI and residual interference; no new entities or fitted constants are introduced in the abstract.

axioms (1)
  • domain assumption Imperfect channel state information and residual decoding errors deteriorate NOMA performance in dense indoor scenarios
    Stated directly in the abstract as motivation for the LiDAL and RLNC additions.

pith-pipeline@v0.9.0 · 5580 in / 1319 out tokens · 42421 ms · 2026-05-16T14:27:42.428660+00:00 · methodology

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Reference graph

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