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Downlink Beamforming with Pinching-Antenna Assisted MIMO Systems

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arxiv 2502.01590 v1 pith:I6ESBQ42 submitted 2025-02-03 cs.IT eess.SPmath.IT

Ali Bereyhi , Saba Asaad , Chongjun Ouyang , Zhiguo Ding , H. Vincent Poor This is my paper
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keywords pinchingsystemsantennaantennasbeamformingdownlinkelementslocations
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Pinching antennas have been recently proposed as a promising flexible-antenna technology, which can be implemented by attaching low-cost pinching elements to dielectric waveguides. This work explores the potential of employing pinching antenna systems (PASs) for downlink transmission in a multiuser MIMO setting. We consider the problem of hybrid beamforming, where the digital precoder at the access point and the activated locations of the pinching elements are jointly optimized to maximize the achievable weighted sum-rate. Invoking fractional programming, a novel low-complexity algorithm is developed to iteratively update the precoding matrix and the locations of the pinching antennas. We validate the proposed scheme through extensive numerical experiments. Our investigations demonstrate that using PAS the system throughput can be significantly boosted as compared with the conventional fixed-location antenna systems, enlightening the potential of PAS as an enabling candidate for next-generation wireless networks.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Multiuser Beamforming for Pinching-Antenna Systems: An Element-wise Optimization Framework

    eess.SP 2025-06 conditional novelty 6.0 of 10

    An element-wise search over pinching-antenna positions, paired with MRT, ZF, or MMSE beamforming, maximizes downlink and uplink sum-rates for pinching-antenna systems without alternating optimization.

  2. Pinching-Antenna System Design with LoS Blockage: Does In-Waveguide Attenuation Matter?

    eess.SP 2025-08 conditional novelty 5.0 of 10

    Under realistic LoS blockage, ignoring in-waveguide attenuation costs only about α^2/(β ln2) bps/Hz in large dense-blockage areas, but the loss grows with area squared when blockages are sparse.

  3. Sum-Rate Maximization for Movable-Antenna Array Enhanced Downlink NOMA Systems

    eess.SP 2025-07 conditional novelty 5.0 of 10

    Proposes a two-stage algorithm that jointly optimizes beamforming, movable-antenna positions, SIC order, and a decoding indicator matrix to maximize sum rate in a downlink NOMA system, with simulations showing gains o...

  4. Secure Pinching Antenna-aided ISAC

    cs.IT 2025-07 conditional novelty 5.0 of 10

    A pinching-antenna ISAC scheme that aligns antennas with users and targets, then optimizes beamforming and artificial noise, is claimed to outperform equidistant and fixed-array baselines by 3-30 dB in illumination power.

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