System and method for transmitting terahertz radar signal based on digital pre-distortion

Abstract

The invention discloses a system and method for transmitting a terahertz radar signal based on digital pre-distortion. The system comprises a radar signal generation module, a clock control module, a digital pre-distortion module, a digital up-conversion module, a digital-to-analog conversion module, a frequency mixing module, a terahertz frequency doubling power amplification module and a radar antenna. The method comprises the steps of receiving data, updating a weight coefficient, obtaining a non-linear compensation signal, obtaining a digital up-conversion signal, obtaining a radio-frequency signal, conducting frequency doubling amplification, and transmitting a terahertz signal. By the adoption of the digital pre-distortion module, non-linear compensation is carried out on a digital baseband signal at the front end of a terahertz radar, and the performance of the terahertz radar transmission system is improved. The digital pre-distortion method is achieved by the adoption of a high-speed field programmable gate array, and the effective bandwidth and the spectral efficiency of the signals are improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a digital predistortion-based terahertz radar signal transmitting system and method in the technical field of terahertz radar. The present invention adopts digital pre-distortion technology realizing high-speed field programmable gate array (Field Programmable Gate Array, FPGA), and performs nonlinear distortion compensation on the terahertz radar transmitter system to solve the problem of the power amplifier in the terahertz radar transmitter. The problem of constrained linear amplification range improves the performance of terahertz radar transmission system. Background technique [0002] In the terahertz radar communication system, in order to obtain sufficient operating distance, it is necessary to increase the transmission power of the transmitter, which causes the operating point of the power amplifier to approach the saturation region, which causes nonlinear di...

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Problems solved by technology

The disadvantage of the device disclosed in this patent application is that the nonlinear compensation range of the signal is small, and its adaptive equalizer is realized by a digital filter, while the terahertz radar is a signal with high frequency and large bandwidth, and the ordinary digital filter It is difficult to meet the requirements, which makes it difficult for the digital predistortion system based on ordinary digital circuits to be widely used in high-frequency, large-bandwidth signal processing occasions such as terahertz radar

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