System Architecture
The THz coherent communication system employs a single-carrier coherent transmission architecture and supports modulation formats ranging from quadrature phase-shift keying (QPSK) to 64-ary quadrature amplitude modulation (64-QAM), allowing transmission reliability and spectral efficiency to be adapted to prevailing link conditions.
At the transmitter, the signal-processing chain comprises source and channel coding, symbol mapping, pulse shaping, digital-to-analog conversion, baseband or intermediate-frequency modulation, THz carrier generation, frequency upconversion, power amplification, and directional radiation, converting the digital information into a single-carrier modulated signal in the THz band. At the receiver, the signal is captured by a high-gain directional antenna and processed through low-noise amplification and coherent downconversion to obtain the in-phase and quadrature components. The digital baseband processing module then performs analog-to-digital conversion, automatic gain control, matched filtering, timing synchronization, carrier-frequency-offset estimation and compensation, phase recovery, channel estimation and equalization, symbol detection, and decoding — enabling accurate recovery of the transmitted information.
| Operating frequency | 90 GHz / 140 GHz / 220 GHz |
| Data rate | ≥ 20 Gbps |
| Modulation formats | QPSK, 16QAM, 32QAM, and 64QAM |
| Channel coding | Low-density parity-check (LDPC) codes |
| Coding gain | ≥ 6 dB |
| Transmission distance | ≥ 1 km |
| Dimensions | ≤ 300 mm × 300 mm × 200 mm |
| Weight | ≤ 10 kg |
| Power consumption | ≤ 500 W |
Baseband Processing Chassis
THz RF Chassis
THz Lens Antenna
