KEYWORDS: Telecommunications, Modulation, Wireless communications, Transceivers, Signal generators, Reliability, LabVIEW, Internet of things, Eye, Digital modulation
With the rapid advancement of the Internet of Things, terahertz band has emerged as a prominent area of research for high-speed wireless communication over the past decade to satisfy the growing demand for network traffic and is extensively employed in indoor wireless communication systems. This study experimentally examines the transmission efficacy of MSK signals in terahertz channels via upconversion. In the LabVIEW development environment, the PN sequence serves as the baseband signal. The MSK signal, with a bandwidth of 1GHz and a transmission rate of 1Gbit/s, is modulated and output using the high-speed vector signal transceiver platform, PXIe-5841. This signal is then upconverted to 230~300GHz for wireless transmission. The findings from the constellation and grid diagrams reveal the stable and reliable transmission of the MSK signal in the terahertz communication system, underscoring its viability and potential for future research and application.
Recently, research on 6G wireless communication technology has become a hot topic. In 6G technology, terahertz communication is considered the most promising part. The research and application of the terahertz communication frequency range (0.1-10 THz) will bring revolutionary changes to the field of communication. It has the potential to bridge the transmission gap between the infrared and microwave bands, and offers highspeed data transmission, low latency, and high-capacity communication. Therefore, the development of terahertz communication is highly anticipated as a significant driving force for 6G technology. At present, research on outdoor terahertz channels is far less extensive compared to indoor channels, requiring more efforts to explore the characteristics of outdoor terahertz channels. In this paper, we focus on the three-dimensional scenario of street canyon and model the terahertz channel using ray tracing. The carrier frequencies used for simulation range from 220 to 330 GHz. By calculating the power loss and required time for each path from the transmitter to the receiver, we obtain parameters such as power delay spectrum and power angle spectrum. Next, we analyze the relationships between path loss, delay spread, angle spread, and distance, gaining further understanding of the outdoor terahertz multipath channel characteristics.
With the advancement of terahertz technology, there is growing anticipation for 6G communication in the international community, and terahertz communication is gaining increasing attention. Nonetheless, terahertz waves possess strong directionality, leading to the obstruction of transmission signals. Consequently, achieving largeangle, directed transmission poses a technical obstacle for terahertz communication. Metasurfaces technology has great potential to improve the coverage performance of 6G networks, making it one of the most promising technologies in this field. This paper designed a terahertz directional reflector that is insensitive to polarization in the terahertz communication band (0.25 THz). The unit structure is selected using the resonant phase modulation principle, utilizing a metal-insulator-metal structure. Following the phase compensation principle, the structure of the unit is arranged and simulation experiments are conducted to achieve a 30-degree abnormal deflection of the reflected beam. This scheme will hold some application value for terahertz 6G channel control in future research.
In this thesis, firstly, based on the MATLAB/Simulink platform, the simulation channel module for terahertz wave (300GHz) communication is established based on the MPM modeled clear sky atmospheric channel,and Hamming (7,4) and RS (188,204) channel compilation code and 2FSK, QPSK, 16QAM signal modulation and demodulation, which are commonly used in the traditional frequency bands, are selected to form a simulation model of terahertz communication system. By comparing the BER analysis, it is found that Hamming (7,4) coding and QPSK modulation technology can achieve relatively low BER, but the traditional modulation and coding method has poor performance in terahertz communication at low SNR.Then,the experiments conducted on the wireless communication system controlled by LabVIEW on the PXIe platform confirmed and validated the conclusions derived from the simulations.
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