Antenna Activation and Resource Allocation in Multi-Waveguide Pinching-Antenna Systems

The paper presents a clear logical flow, starting from the problem statement and related work, formulating a comprehensive optimization problem, decoupling it into manageable sub-problems, proposing specific algorithms for each, and finally validating the solutions through simulations. The connections between the sub-problems (e.g., SIC order depending on assignment/activation) are well-articulated.

Strengths: Detailed mathematical formulation of the joint optimization problem., Rigorous decoupling of the complex problem., Derivation of a clear condition for optimal SIC decoding order., Application of established game theory principles (coalition formation) for discrete optimization., Application of established optimization techniques (monotonic optimization, SCA) for continuous optimization., Complexity and convergence properties of proposed algorithms are analyzed., Comparison of performance with relevant benchmark systems.
Weaknesses: Reliance solely on simulation results without experimental validation., Assumptions made in the simulation setup (e.g., channel model, antenna distribution).

Simulation results are provided across various scenarios (different K, N, M, transmit power, target rate) to support the claims of performance superiority and effectiveness of the proposed algorithms and SIC order design. The figures clearly illustrate the trends and comparisons discussed in the text.

The paper proposes a novel framework for a *practical multi-waveguide* pinching-antenna system with *discrete activation* and *NOMA*. The joint optimization of waveguide assignment, antenna activation, SIC order, and power allocation is a complex, multi-faceted problem addressed comprehensively. The application of coalitional games for assignment/activation and the combined use of monotonic optimization and SCA for power allocation, within this specific system context, demonstrate high originality compared to prior work which focused on single-waveguide or different aspects.

Pinching antennas are identified as a promising technology for future (6G) wireless communications. Addressing practical implementation challenges (discrete placement, activation) and developing effective resource allocation strategies for multi-waveguide NOMA systems contributes significantly to the feasibility and potential performance gains of this technology. The proposed methods offer pathways to improve spectral efficiency and reliability, relevant for high-density user environments.

Strengths: Formal and precise language., Key concepts are defined or described., Mathematical formulations are clearly presented., Algorithm steps are outlined., Simulation setup and results are described clearly.
Areas for Improvement: None