研究目的
To propose a new L-band digital aeronautical communication system (LDACS) using reconfigurable filtered OFDM (Ref-OFDM) to improve spectrum efficiency and support dynamic bandwidth adaptation for various services in air-to-ground communication.
研究成果
The proposed reconfigurable LDACS protocol and Ref-OFDM waveform significantly improve spectrum utilization, support dynamic bandwidth adaptation, and reduce interference to incumbent users. Simulation results show better BER performance and lower complexity compared to existing waveforms, making it a promising solution for next-generation aeronautical communication systems. Future work includes extension to air-to-air communication and hardware implementation.
研究不足
The study is based on simulations and theoretical analysis; experimental validation with hardware is not fully detailed in this paper (referenced in other works). The proposed system may face challenges in real-world implementation, such as hardware complexity and adaptation to varying channel conditions.
1：Experimental Design and Method Selection:
The study involves designing a reconfigurable LDACS protocol with a new frame structure and Ref-OFDM waveform using a reconfigurable linear phase multi-band FIR digital filter. Theoretical BER analysis is performed in the presence of DME interference and LDACS wireless channels.
2：Sample Selection and Data Sources:
Simulations are conducted using LDACS specifications and realistic channel models (APT, TMA, ENR) based on empirical studies and prior literature.
3：List of Experimental Equipment and Materials:
No specific physical equipment is mentioned; simulations are performed using computational tools.
4：Experimental Procedures and Operational Workflow:
The transmitter and receiver designs are detailed, including signal processing blocks like IFFT, cyclic prefix addition, filtering, and synchronization. Simulations compare Ref-OFDM with other waveforms (OFDM, GFDM, FBMC) in terms of PSD, BER, and complexity.
5：Data Analysis Methods:
BER is analyzed using theoretical expressions and numerical methods; PSD and interference are evaluated through simulations; complexity is compared based on the number of real multiplications.
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