研究目的
To demonstrate ultra-fast millimeter wave beam steering with settling times below 50 ps using a phased array antenna with two elements and a recently introduced time delay line for symbol-by-symbol steering.
研究成果
The paper demonstrates an ultra-fast beam steering scheme capable of symbol-by-symbol steering at 10 GBd, with settling times below 50 ps. This high steering speed is achieved using a microwave photonics approach, showing potential for increasing the reach and reducing inter-cell interference of the radio access network.
研究不足
The demonstration is confined to a PAA FN with only 2 antennas and to a CPSS implementation without a SCT-scheme, limiting the tuning range but not degrading the functionality.
1：Experimental Design and Method Selection:
The experiment employs a phased array antenna with two elements and a novel microwave photonics true-time delay scheme called Complementary Phase Shifted Spectra (CPSS) for ultra-fast, broadband, and continuous tuning.
2：Sample Selection and Data Sources:
The setup includes a RoF transmitter and a PAA in the RAU with two antennas, using a 10 Gbit/s TDM data signal generated by an arbitrary waveform generator.
3：List of Experimental Equipment and Materials:
Equipment includes an AWG M8195A, lithium niobate (LiNbO3) Mach-Zehnder modulator, 40 GHz photodetectors from Albis Opto, and custom designed Vivaldi antennas.
4：Experimental Procedures and Operational Workflow:
The combined signal is split and fed to a 2×1 array feeder, with a CPSS filter on antenna 1 and a fixed time delay line on antenna 2. The signals are then analyzed using a real-time oscilloscope.
5：The signals are then analyzed using a real-time oscilloscope.
Data Analysis Methods:
5. Data Analysis Methods: The performance is assessed by measuring the steering capability with frame based TDM sequence and symbol-by-symbol steering, analyzing the received signal for two UEs.
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