105-Gb/s Photonics-Aided THz Communication With FPGA-Based Low-Complexity Resampling and Equalization

In this experiment, we demonstrated a photon-assisted terahertz (THz) wireless transmission system based on a field-programmable gate array (FPGA). By utilizing envelope detection and antenna polarization multiplexing, the system successfully achieves 105-Gb/s data transmission over a wireless distance of 3 m. To support this, low-complexity resampling and equalization modules were implemented on the FPGA. For resampling, a nonrecursive cascaded integrator-comb (NR-CIC) filter was used to achieve an upsampling factor of 1.75. For equalization, we innovatively introduced the decision-quantized equalization (DQ-Eq) algorithm. Experimental results indicate that the optimized NR-CIC filter attains antialiasing performance equivalent to a conventional 41-tap time-domain (TD) filter. Moreover, compared to the signsign equalization, DQ-Eq exhibits faster convergence speed and a lower bit error rate (BER). Compared with traditional equalization, DQ-Eq reduces computational complexity by 13.8%, thereby significantly improving the efficiency of hardware implementation. These experimental results fully validate the advantage of the proposed scheme in reducing computational complexity, providing an effective and practical solution for real-time THz wireless communication in future 6G networks.