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A Doppler simulation realization method based on digital interposition value

A Doppler code offset and digital signal technology, which is applied in radio transmission systems, transmission monitoring, electrical components, etc., can solve the problems of difficult realization of high-speed digital signals, non-continuous adjustment of chip length, and insufficient resolution, etc. problem, to achieve the effect of increasing the working frequency, high resolution, and strong portability

Inactive Publication Date: 2008-08-13
SHANGHAI ENG CENT FOR MICROSATELLITES
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Problems solved by technology

And usually because the resolution is not high enough, the adjustment of the chip length is not continuous, but jumps, which is inconsistent with the actual situation
[0004] The above method is difficult to implement when generating high-speed digital signals, because the code rate of digital signals is already high at this time, and if it is increased by ten times or higher, it will not be able to bear by the hardware platform

Method used

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  • A Doppler simulation realization method based on digital interposition value
  • A Doppler simulation realization method based on digital interposition value
  • A Doppler simulation realization method based on digital interposition value

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Embodiment 1

[0042] Assuming that the information code rate is 20k and the sampling rate is 160k baseband shaped signal, it is necessary to simulate the data whose code rate becomes 25k after the Doppler effect and the sampling rate is still 160k. We know that the larger code rate actually means that the chips are compressed on the time axis, that is, the chip length is 0.05ms when the code rate is 20k, and the chip length is 0.04ms when the code rate is 25k. We compress the digital signal with a code rate of 20k and a sampling rate of 160k to a code rate of 25k, and the sampling rate becomes 160*25k / 20k=200k. However, when we transmit, the general sampling rate is unchanged, that is, we want to obtain a signal with a sampling rate of 160k, which requires us to obtain a sampling signal of 160k through a sampling signal of 200k. The deviation of the 160k sampling signal length relative to the 200k sampling signal is (normalized to a length of 200k). At this time, we set Code_doppler to 1...

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Abstract

The invention discloses a technical method for accomplishing Doppler offset stacking analog of digital signal source. The method simulates influence of the Doppler offset stacking to digital signal in reality via processing digital interpolation process for sampling point after high power code speed digit is formed. A secondary interpolation method is adopted to calculate value on interpolation point. Speed of the digital symbol after interpolation alters according to simulating code offset. Constant processing speed is implemented ordinarily by FPGA so as to correspond to altering characteristic of the code stream. Processing speed is improved and FIFO cache is configured, implementing alternation of code speed by waiting method. In order to improve shortcoming that the interpolation has large matrix operation, implementing interpolation operation by way of Farrow filter. The structure is simpler and operation is smaller.

Description

Technical field: [0001] The invention relates to digital communication coding technology, in particular to a method for realizing Doppler code deviation simulation of digital signal source based on digital interpolation technology. Background technique: [0002] Currently, signal source simulation technology is an important technology. It can simulate the actual signal before the communication system is completed, provides the input of the simulation for the system design, and provides an important reference for the development of the receiver in the communication system. There are many different aspects of the simulation of the actual signal source, including multipath problems in the signal transmission process, Doppler problems, noise characteristics and channel characteristics and so on. These problems affect the performance of the receiver, so the controllable simulation of the above problems will provide useful help for the analysis of the performance of the receiver....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/01H04B17/00H04B17/20
Inventor 刘亚欢田宇段善维
Owner SHANGHAI ENG CENT FOR MICROSATELLITES
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