Environment-Dependent Downlink Pinching-Antenna Systems: Spectral-Energy Efficiency Tradeoffs and Design.

Area of Science:

• Wireless Communications
• Antenna Systems
• Signal Processing

Background:

• Pinching-antenna systems (PASSs) provide low-complexity, reconfigurable near-field communication solutions.
• Existing research often simplifies propagation or focuses solely on spectral efficiency, neglecting energy efficiency impacts of environmental interference.
• The influence of user-specific blockage on energy-efficient PASS design is not well understood.

Purpose of the Study:

• Investigate an energy-efficient downlink design for single-waveguide PASS using environment-division multiple access (EDMA).
• Analyze how blockage-dependent interference patterns affect the spectral and energy efficiency trade-off.
• Develop an energy-aware EDMA framework optimizing antenna placement and power allocation under quality-of-service constraints.

Main Methods:

• Exploited user-dependent blockage and visibility differences via pinching-antenna placement to induce distinct multi-user interference patterns.
• Developed an energy-aware EDMA framework using alternating optimization for joint antenna location and power allocation.
• Compared EDMA against time-division multiple access (TDMA) using a unified hardware and power-consumption model.

Main Results:

• Identified clear energy-efficiency threshold behaviors related to blockage intensity, user numbers, and service demands.
• Demonstrated that EDMA can significantly outperform TDMA in certain operating conditions.
• Showcased EDMA's ability to manage interference and enhance energy efficiency without increased RF complexity.

Conclusions:

• EDMA offers a promising approach for energy-efficient PASS downlink communications by intelligently managing interference through antenna configuration.
• The framework provides valuable insights into the interplay between spectral efficiency, energy efficiency, and environmental factors in wireless systems.
• EDMA's performance advantages over TDMA are contingent on specific system parameters and operating regimes, highlighting the importance of environment-aware design.