KEYWORDS: Telecommunications, Denoising, Oscillators, Signal to noise ratio, Interference (communication), Information and communication technologies, Terahertz radiation, Signal generators, Transmitters, Antennas
With the rapid development of 5G communication technology, terahertz wave has attracted extensive attention due to its large capacity, good directivity and strong anti-interference ability. However, in the terahertz communication system based on the subharmonic mixing method, in the process of generating the terahertz signal, due to the high frequency multiplication, the floor and phase noise of the original frequency source pass through the frequency doubling and amplification links, and the spectrum is realized. The shifting and amplification are degraded, while the circuitry of the link itself also produces an in-band noise superposition. In order to reduce noise, this paper studied on the basis of the principle of harmonic mixing terahertz communication system of the high harmonics and the vibration noise impact on the quality of communication, this paper proposes a method of harmonic interference suppression method this method by selecting the required harmonic band-pass filtering, set the appropriate frequency range can make other harmonic component to fall outside the frequency band, so as to achieve effect of reducing the noise of a terahertz communication system.
KEYWORDS: Signal to noise ratio, Telecommunications, Wireless communications, Information and communication technologies, Modulation, Interference (communication), Terahertz technology, Demodulation
With the advent of the 5G era, the demand for wireless communication rates is increasing, making high-speed wireless communication become a hot spot and focus. Due to the wider frequency bandwidth and good confidentiality, the terahertz band has attracted wide attention in the field of high-speed wireless communication above Gbps. However, terahertz wave is easily absorbed by water and attenuates seriously when it is transmitted in the atmosphere, which seriously restricts the development of communication in the terahertz band. However, the spread spectrum communication has attracted much attention in the field of terahertz communication because of its strong anti-fading, anti-interference and good confidentiality. In this paper, the simulation model of direct sequence spread spectrum (DSSS) communication system is established by using MATLAB, and the baseband signal and m-sequence spreading code of different rates are set, and 310GHz is used as the carrier frequency to transmit in additive white Gaussian noise channels with signal-to-noise ratio (SNR) of 17dB to -1dB. Medium transmission, by checking the bit error rate (BER), to verify the anti-interference of the DSSS technology applied in the terahertz band. The simulation results show that when the spread spectrum gain is large, the DSSS can be used in terahertz communication under the same BER to transmit in channels with a SNR of 10dB worse. Therefore, the application of spread spectrum communication technology to terahertz communication has a good development scenario and will effectively promote the development of terahertz communication.
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