Fig. 1. Structure of terahertz signal transmitter based on electronic components

Fig. 2. Schematic diagram of DMT

Fig. 3. Schematic diagram of OFDM system：（a） schematic diagram of OFDM-DMT system； （b） schematic diagram of DFT-S OFDM-DMT system

Fig. 4. 300 GHz terahertz transmission structure of OFDM-DMT wireless signals with a distance of 1 m：（a） schematic diagram of 300 GHz terahertz transmission system； （b） transmitter devices of the 300 GHz terahertz system； （c） receiver devices of the 300 GHz terahertz system

Fig. 5. Spectrum of a PS-16QAM OFDM-DMT signal at the receiving end

Fig. 6. Probability distribution of PS-16QAM signals

Fig. 7. Constellation and BER versus data rate of PS-16QAM and 16QAM signals：（a） BER versus data rate of PS-16QAM and 16QAM signals； （b） constellation of 12 GBaud 16QAM OFDM-DMT signal after DSP； （c） constellation of 12 GBaud PS-16QAM OFDM-DMT signal after DSP

Fig. 8. NGMI versus data rate of PS-16QAM and 16QAM signals

Fig. 9. Probability distribution of PS-64QAM signals

Fig. 10. Constellation and BER versus data rate of DFT-S PS-64QAM and PS-64QAM signals：（a） BER versus data rate of DFT-S PS-64QAM and PS-64QAM signals； （b） constellation of 10 GBaud PS-64QAM OFDM-DMT signal after DSP； （c） constellation of 10 GBaud DFT-S PS-64QAM OFDM-DMT signal after DSP

Fig. 11. NGMI versus data rate of DFT-S PS-64QAM and PS-64QAM signals