Time-domain parallel digital demodulation system

Abstract

The invention discloses a time-domain parallel digital demodulation system, comprising a time-domain parallel sampling rate conversion module, a parallel matched filter module, a parallel clock recovery module, a time-domain parallel carrier recovery module and a differential decoding module, wherein the time-domain parallel sampling rate conversion module is used for converting the sampling rateof a sampling digital signal obtained by a high speed A / D converter, the parallel matched filter module is used for matched filtering the signal after sampling rate conversion, the parallel clock recovery module is used for carrying out timing recovery and re-sampling on the modulating signal after matched filtering, the time-domain parallel carrier recovery module is used for recovering the phasedifference and the frequency difference of the signal output by the parallel clock recovery module, and the differential decoding module is used for differential decoding the signal which is output by the time-domain parallel carrier recovery module and has phase ambiguity. The technical scheme of the invention can realize universal receiving demodulation with variable data rate and low cost, thus completing digital demodulation reaching up to 1200Mbps.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a digital demodulation system using a time-domain parallel demodulation algorithm, which is applied in the field of high-speed data transmission, such as high-speed remote sensing satellite signal transmission and reception. Background technique [0002] After entering the 21st century, the rise of aerospace technology and its application in the military has rapidly expanded the battlefield airspace from the atmosphere to outer space, expanded the fields of military activities and national defense security, and changed the form of modern warfare. Remote sensing satellite technology is an important part of it. It refers to the use of various sensors (such as visible light, infrared detection, radar, etc.) to obtain ground information on a space-based satellite platform. An applied science and technology of shape, size, location, properties and their relati...

AI Technical Summary

Problems solved by technology

However, the premise that the above structure can work normally is that the local sampling clock and the symbol clock of the data must be 2N, N is a positive integer greater than 2, and general digital demodulation requires that the local sampling clock is fixed, so the APRX structure proposed by Andrew It can only handle a fixed data rate and cannot meet the general demodulation requirements; the third is based on the conventional serial digital demodulation algorithm, which is realized by high-speed GaAs technology. The advantage is that the algorithm is simple and mature, and the disadvantage is that it needs to customize The GaAs chip requires a huge one-time investment and high process conditions, and because the GaAs process is a strictly regulated military technology, it is unrealistic based on my country's current industrial foundation.

Images