Design And Verification On Terahertz Wireless Communication Waveform For 10Gbps Rate

With the demand for high bandwidth of wireless communication and the shortage of frequency band resources,the rich spectrum resources of terahertz waves also fit the development direction of wireless communication,and the wireless communication technology using terahertz wave propagation has become a research hotspot in recent years.Based on the premise of high-speed and high-bandwidth requirements for terahertz wireless communication,this thesis designs a communication waveform and digital baseband link suitable for application scenarios,and performs simulation algorithm verification and hardware implementation verification for it.The main work of the thesis is as follows:First,analyze the transmission characteristics of terahertz waves in the atmosphere and the application scenarios of terahertz waves in point-to-point communication systems on the ground to determine the performance requirements of baseband links.The modulation and demodulation scheme of the baseband waveform is determined,and the signal bandwidth and system throughput are analyzed to complete the preliminary waveform design.Secondly,the timing offset and frequency shift offset brought by the terahertz channel and RF hardware to the baseband system are analyzed to guide the design direction of the relevant correction module at the receiving end.Second,it gives a comprehensive and detailed design of the baseband waveform and data processing flow,determines the components and construction methods of the preamble sequence,and determines the overall data frame structure design including the 8-way parallelization scheme.Then demonstrate and design the key modules at both ends of the transceiver in the baseband link,so that the link can resist the interference factors such as timing deviation,frequency offset,frequency domain fading existing in the terahertz application scenario.Considering certain scalability at the same time when designing the link,the data processing scheme of 8 parallel channels is the same,and the transmission rate of the terahertz communication system can be improved by adding parallel channels.An algorithmic simulation of the overall baseband link is carried out,and the performance of key modules is simulated.Third,implement hardware implementation of the designed digital baseband link and use parallel framing modules to parallelize high-speed signals into low-speed signals that FPGAs can handle.Then,the on-board self-loopback test is performed on the transmitter and receiver realized by hardware to verify the feasibility of the design scheme of the terahertz wireless communication waveform system and the performance of the time-frequency synchronization module.The test baseband system simulates a terahertz channel environment and achieves a service rate of 10 Gbps,which can resist 40 kHz frequency offset and 28 ns times the symbol time slot timing offset,and achieve a bit error rate at a signal-to-noise ratio of 26.5dB.This thesis designs a digital baseband waveform suitable for terahertz wireless communication and with high rate and high bandwidth.Through the software simulation of the algorithm,the hardware implementation of the transceiver link,and the board-level loopback test,the feasibility verification of the design scheme is completed,which has engineering reference significance for the design and implementation of the baseband waveform of the terahertz wireless communication system.