Ka waveband radio frequency modulation system and method

Abstract

The present invention proposes a Ka-band radio frequency modulation system and method, including: a baseband signal processing module, which receives a digital baseband signal, and performs constellation mapping on it according to a corresponding modulation mode, and performs shaping and filtering on the generated constellation mapping symbols Output; the digital-to-analog conversion processing module is connected to the baseband signal processing module to perform digital-to-analog conversion and filtering on the shaped and filtered data signal, and output the analog baseband signal; the carrier source generation module is used to generate and output modulation Carrier signal; quadrature analog modulator, connected to the digital-to-analog conversion processing module and the carrier source generation module, for performing quadrature analog modulation on the analog baseband signal according to the carrier signal, and outputting a modulated radio frequency signal. It solves the problems of poor performance index and flexibility of common modulation systems, and achieves the characteristics of simple circuit, small footprint, low power consumption, excellent modulation performance index, and strong flexibility.

Description

technical field [0001] The invention relates to the field of modulation technology, in particular to a Ka-band radio frequency modulation system and method. Background technique [0002] The traditional spaceborne data transmission modulation method adopts MPSK (multi-ary digital phase modulation) analog radio frequency modulation technology. Specifically, the bipolar baseband data signal without data processing is used to control the switch of the mixer. The mixer works in the saturation region, so the nonlinear index of the modulated signal output by the mixer is poor, and the frequency band utilization rate is not high. Band-pass filters filter out pass-band interference. Due to the increase of data communication transmission rate, the substantial increase of frequency band, such as the improvement of EVM (error vector magnitude) and amplitude-phase imbalance, the performance of high-speed transmission of the system is greatly limited. [0003] In addition, linear modul...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a Ka-band radio frequency modulation system and method, which solves the problems of poor performance index and flexibility of common modulation systems, and can realize various complex modulation methods such as MPSK, MQAM, MAPSK, etc., and achieves the realization of circuit Simple, small footprint, low power consumption, excellent modulation performance indicators, and strong flexibility

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