Fig. 1. Terahertz communication perception integration system based on photons (ECL: external cavity lasers; I/Q MOD: I/Q modulator; LO: local oscillator; MZM: Mach-Zender modulator; PM-OC: polarization-maintaining optocoupler; PD: photodiode; EA: electrical amplifier; PRBS: pseudo-random sequence; LPF: low-pass filter; ADC: analog-to-digital converter; OSC: oscilloscope)

Fig. 2. Terahertz communication system based on photons

Fig. 3. LFM signal fuzzy function diagram (B=10, T=1) and contour plot. (a) LFM signal fuzzy function diagram (B=10, T=1); (b) contour plot

Fig. 4. Photon terahertz radar perception system based on compressed sensing

Fig. 5. Compressed sensing module (PRBS: pseudo-random sequence)

Fig. 6. FDM-based QPSK signal and LFM integrated signal spectrogram

Fig. 7. Spectrum of integrated signal based on FDM communication perception

Fig. 8. QPSK signal constellations. (a) Original QPSK signal constellation; signal constellations after (b) clock recovery, (c) cascaded multi-modulus algorithm (CMMA) equalization, (d) frequency offset compensation, and (e) phase offset compensation

Fig. 9. Bit error rate varying with PD input power of QPSK signal

Fig. 10. 16QAM signal constellations. (a) Original image; 16QAM signal constellations after (b) clock recovery, (c) cascaded multi-modulus algorithm (CMMA) equalization, (d) frequency offset compensation, and (e) phase offset compensation

Fig. 11. Bit error rate varying with PD input power of 16QAM signal

Fig. 12. Signal time domain diagram and signal frequency domain diagram when the measurement distance is 1.2 m and the sampling frequency is 400 MSa/s. (a) Signal time domain diagram; (b) signal frequency domain diagram

Fig. 13. Signal reconstruction time domain diagram and signal reconstruction frequency domain diagram when the measurement distance is 1.2 m and the sampling frequency is 100 MSa/s. (a) Signal reconstruction time domain diagram; (b) signal reconstruction frequency domain diagram

Fig. 14. Signal time domain diagram and signal frequency domain diagram when the measurement distance is 1.4 m and the sampling frequency is 400 MSa/s. (a) Signal time domain diagram; (b) signal frequency domain diagram

Fig. 15. Signal reconstruction time domain diagram and signal reconstruction frequency domain diagram when the measurement distance is 1.4 m and the sampling frequency is 100 MSa/s. (a) Signal reconstruction time domain diagram; (b) signal reconstruction frequency domain diagram

Fig. 16. Reconstructed distance error varying with measurement distance

Fig. 17. Schematic diagrams of the indicators of the communication perception and mutual aid stage. (a) Schematic diagram of performance index of communication link; (b) schematic diagram of performance index of perceptual link; (c) schematic diagram of communication perception integration performance index

Fig. 18. Performance boundary curves of communication perception integration