High-speed bandwidth modulation method and system adapted to variable rate

Abstract

A high-speed bandwidth modulation method adaptable to variable rates of the present invention, comprising: performing serial-to-parallel conversion on the input baseband signal into parallel N-channel data, and performing channel coding and modulation mapping on each channel of data; Each channel of data is converted into PLF frame and buffer, and single channel or multi-channel is selected according to the symbol rate; if multiple channels are selected, a frame of data is serially converted into multiple channels of data; inter-symbol interference is eliminated by adding a cyclic prefix ; Select the filter channel according to the modulation symbol rate to realize variable data rate and shaping; move the shaped multi-channel data spectrum into one data, and perform digital-to-analog conversion and output analog signals. The invention organically combines multi-channel implementation, IDFT and rate matching modules to realize variable-rate high-speed bandwidth modulation, which not only ensures signal transmission quality, but also realizes high-speed, high-efficiency, and variable-rate modulation.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and relates to a high-speed bandwidth modulation method and system adaptable to variable rates. Background technique [0002] The data transmission system in satellite communication is the focus of modern aerospace research. With the rapid development of satellite communication, the types and quantities of transmitted data are increasing, which puts forward new requirements for high-speed and massive satellite data transmission. Since the physical layer of the transmission system is generally implemented by FPGA or DSP, due to technical limitations, the highest working rate of the two is about 700MHz, but the relative price will be higher. If you want to achieve high-speed bandwidth 800MSPS or higher symbol rate data Transmission, which requires a new algorithm to achieve. [0003] At present, the realization of high speed and large bandwidth is mainly through the use of high-eff...

AI Technical Summary

Problems solved by technology

There are generally two ways to realize it: one is to use a single fixed frequency working clock to generate symbol pulses, shaped filter pulses and phase shift control words to complete constellation mapping, pulse shaping filtering and arbitrary sampling rate conversion, with less resource consumption The continuous variable modulation of the symbol rate is realized, but the symbol rate span that this method can realize is small; the other is to realize the variable symbol rate by changing the operating clock frequency, but this requires the use of a dedicated clock generation chip, such as a direct Digital frequency synthesis DDS chip, which leads to the disadvantages of complex hardware design and high cost

Images