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

Abstract

The invention provides a high-speed bandwidth modulation method adapted to a variable rate. The method comprises the following steps: performing serial and parallel conversion on an input baseband signal to divide the input baseband signal into N paths of parallel data, and performing channel coding and modulation mapping on each path of data; converting each path of data subjected to the modulation mapping into a PLF frame and a buffer, and selecting a single channel or multiple channels according to the symbol rate; if multiple channels are selected, performing serial and parallel conversionon a frame of data to obtain multiple paths of data; eliminating intersymbol interference by adding a cyclic prefix; achieving the variable rate and molding of the data by selecting a filtering channel according to the modulation symbol rate; and shifting the frequency spectrum of the molded multiple paths of data, and performing digital-to-analog conversion and outputting an analog signal. According to the high-speed bandwidth modulation method, the multi-channel implementation, IDFT and rate matching modules organically to realize high-speed bandwidth modulation with a variable rate, whichnot only ensures the 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...

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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 a small 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

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