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ZHOU Yixiao, LI Xuan, WANG Guodong, et al. Photonic-Aided doppler-robust ISAC system based on multi-slope division multiplexing[J]. Journal of Radars, in press. doi: 10.12000/JR26034
Citation: ZHOU Yixiao, LI Xuan, WANG Guodong, et al. Photonic-Aided doppler-robust ISAC system based on multi-slope division multiplexing[J]. Journal of Radars, in press. doi: 10.12000/JR26034
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Photonic-Aided Doppler-Robust ISAC System Based on Multi-Slope Division Multiplexing

DOI: 10.12000/JR26034 CSTR: 32380.14.JR26034

  • Communication System Teaching and Researching Office, Information and Navigation College, Air Force Engineering University, Xi’an 710003, China

Funds:  Shaanxi Province Young Innovation Team in Higher Education Institutions (2022-106)
More Information
  • Corresponding author: LI Xuan, lixuanrch@163.com
  • Received Date: 2026-01-29
    Available Online: 2026-04-03
    Abstract
  • Current photonic-assisted integrated sensing and communication (ISAC) systems face significant challenges under low signal-to-noise ratio (SNR) and high-dynamic conditions, such as those in low Earth orbit satellite networks. To address these issues, this study proposes a novel photonic-assisted Doppler-robust ISAC system based on multislope division multiplexing. A slope division multiplexed frequency shift keying–linear frequency modulation (SDM–FSK–LFM) waveform is designed by multiplexing LFM subcarriers with distinct chirp rates. This design is combined with successive interference cancellation to achieve high spreading gain while substantially increasing the communication data rate. A photonic-assisted ISAC transceiver utilizing an optical frequency comb local oscillator is developed for high-frequency signal generation and optical-domain dechirping processing. Experimental results show successful generation of a 10-subcarrier SDM–FSK–LFM signal in the Ku-band with an instantaneous bandwidth of 1.536 GHz. In sensing, the system achieved a superresolution ranging accuracy of 0.05 m. In communication, a back-to-back data rate of 95.86 Mbps was realized, with seven subcarriers maintaining a bit error rate (BER) <10−4 at 0 dB SNR and five subcarriers sustaining a BER <10−5 under a Doppler shift of 200 kHz.

     

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