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Photonics-assisted integrated sensing and communication with ranging resolution improvement by multiple signal
Optics Express
|June 14, 2025
Summary
This study demonstrates a photonics-assisted integrated sensing and communication (ISAC) system. It improves communication receiver sensitivity and enhances radar target detection resolution using advanced equalization and signal processing techniques.
Area of Science:
- Photonics
- Wireless Communication
- Sensing Technology
Background:
- Integrated Sensing and Communication (ISAC) systems combine radar and communication functionalities.
- Photonics-assisted millimeter-wave (MMW) technology offers a promising approach for ISAC.
- Orthogonal Frequency-Division Multiplexing (OFDM) is a key modulation technique for high-speed data transmission.
Purpose of the Study:
- To experimentally demonstrate a low-cost, simple photonics-assisted OFDM ISAC system.
- To compensate for nonlinear distortion in the communication link.
- To enhance the ranging resolution of the radar function.
Main Methods:
- Utilizing intensity modulation and envelope detection for the ISAC system.
- Employing decision feedback frequency domain Volterra nonlinear equalization (DF-FD-VNLE) for communication distortion compensation.
- Implementing the Multiple Signal Classification (MUSIC) algorithm for radar ranging enhancement.
Main Results:
- DF-FD-VNLE improved receiver sensitivity by 1.8 dB at the HD-FEC threshold for 4 Gbps OFDM signals.
- MUSIC algorithm enhanced single-target detection from 15 cm to 1 cm and dual-target detection from 21 cm to 10 cm.
- Achieved an 18.6 dB improvement in Peak-to-Sidelobe Ratio (PSLR).
Conclusions:
- The proposed photonics-assisted OFDM ISAC system effectively addresses nonlinear distortion and improves sensing resolution.
- The implemented DF-FD-VNLE and MUSIC algorithms significantly enhance system performance.
- This work presents a viable low-cost solution for advanced ISAC applications.
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