Base band data generation method and system at any sampling rate

A baseband data and generation system technology, applied in the field of signal processing, can solve problems such as poor practicability, complex design, and complex implementation

Active Publication Date: 2018-06-12
BEIJING RES INST OF TELEMETRY +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] In the existing signal sampling design, in order to meet the requirement of continuously variable data code rate, one method is to change the sampling rate of the DAC by reconfiguring parameters according to the code rate of the transmitted data, so that the number of sampling points is fixed. The first method is complex to implement, and is limited by the hardware platform, so the practicability is not strong; the other method is to use the interpolation filter to perform fractional interpolation. This method is complex in design and consumes a lot of hardware resources when the data bit rate is relatively high. , not widely used

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  • Base band data generation method and system at any sampling rate
  • Base band data generation method and system at any sampling rate
  • Base band data generation method and system at any sampling rate

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Embodiment

[0115] In this embodiment, the input signal code rate R b Set to 299Mbps, reference clock frequency f 0 Set it to 150Mbps, set the number of NCO bits to 32 bits, then calculate the frequency division coefficient D = 20, the frequency multiplication coefficient M = 1, and the NCO step amount FCW is Use NCO to generate frequency f 1 = After the sine wave signal of 14.95MHz, output the sine wave signal from the DAC. After passing through the level processing module, it is input from the global clock pin of the FPGA to be used as the FPGA input clock. According to this clock signal, the frequency multiplier is configured in the FPGA. Coefficient M=20, frequency division coefficient D=1, get the frequency f 2 = 299MHz clock signal, use this frequency as f 2 =299MHz clock signal to generate the baseband signal, the uniform output of the signal can be realized.

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Abstract

The invention relates to a base band data generation method and system at any sampling rate. The base band data generation system is adopted for implementation of the method and comprises an FPGA, a digital-to-analogue conversion module and an electric level processing module. According to the base band data generation method, sine wave signals are generated by the FPGA according to the code rate,division factor and clock multiplier factor of base band signals, the filtered sine wave signals are used as input clocks of the FPGA, clock signals with the frequencies same as the code rate valuesof the base band signals are generated, and even output of base band data is achieved. According to the base band data generation method, output signal clocks are calculated according to the signal code rate in real time, the requirement of the continuous and variable code rate can be met, the method is suitable for the system with high code rate of transmission data, and the method is easy to design and implement, wide in application and capable of consuming few hardware resources.

Description

technical field [0001] The invention relates to a baseband data generating method and a generating system with an arbitrary sampling rate, belonging to the field of signal processing. Background technique [0002] In the existing signal sampling design, in order to meet the requirement of continuously variable data code rate, one method is to change the sampling rate of the DAC by reconfiguring parameters according to the code rate of the transmitted data, so that the number of sampling points is fixed. The first method is complex to implement, and is limited by the hardware platform, so the practicability is not strong; the other method is to use the interpolation filter to perform fractional interpolation. This method is complex in design and consumes a lot of hardware resources when the data bit rate is relatively high. , are not widely used. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to pro...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06F1/02
CPCG06F1/022
Inventor武光辉李英飞李晓亮王丽郑建君吴鹏程
OwnerBEIJING RES INST OF TELEMETRY