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Doppler carrier shift emulator for high-dynamic mobile telecommunication channel

A Doppler frequency shift and mobile communication technology, applied in the field of mobile communication channel Doppler frequency shift simulators, to achieve the effects of simple and convenient implementation, convenient use and strong simulation ability

Inactive Publication Date: 2007-04-04
中国人民解放军总参谋部第五十四研究所
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Problems solved by technology

At present, the change of signal bandwidth is mainly simulated by changing the signal code rate. This method has two shortcomings: one is only suitable for implementation at the signal source, and it is difficult to process any generated signal; the other is that some complex modulated signal forms , the change of the signal code rate cannot fully reflect the influence of Doppler on the signal bandwidth

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  • Doppler carrier shift emulator for high-dynamic mobile telecommunication channel
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Embodiment Construction

[0024] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0025] Suppose the input signal is a pulse modulation signal, the center frequency of the signal is 1MHz, and the pulse width is 0.0067ms. Using the present invention to perform Doppler frequency shift on the signal, the Doppler frequency shift value at the center frequency point is -15kHz.

[0026] Referring to Fig. 1, the signal preprocessing unit samples the input signal, the sampling rate is 3Msps, and the number of sampling points is 1024. The interpolation fitting unit is used to perform cubic spline interpolation on the sampled data to obtain 1039 data, and the data sampling rate becomes 3.0467Msps. The time-frequency transformation unit pads the data with zeros, and performs 2048-point FFT operations to obtain frequency domain data. Use the sampling unit to perform 1 / 2 sampling on the...

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Abstract

The invention is concerned with the achieving project of the high dynamic mobile communication channel Doppler frequency-shift simulator, the project solves the Doppler frequency-shift simulating problem of the signal transmission at the high dynamic environment by the signal processing technology such as the time frequency domain transform, the interpolation fitting, the sampling.

Description

technical field [0001] The invention relates to the technical field of simulation, in particular to a Doppler frequency shift simulator of a mobile communication channel in a high dynamic environment. Background technique [0002] The impact of Doppler frequency shift caused by signal transmission in a high dynamic environment on the signal is mainly manifested in two aspects: center frequency shift and signal bandwidth change. The center frequency shift can be solved by frequency mixing and DDS technology. At present, the change of signal bandwidth is mainly simulated by changing the signal code rate. This method has two shortcomings: one is only suitable for implementation at the signal source, and it is difficult to process any generated signal; the other is that some complex modulated signal forms , the change of the signal code rate cannot fully reflect the influence of Doppler on the signal bandwidth. Contents of the invention [0003] The present invention aims at...

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Application Information

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IPC IPC(8): H04B17/00
Inventor 陈长征段涛王沙飞黄玉洁王健李淑华陈兵王朝霞张霄
Owner 中国人民解放军总参谋部第五十四研究所
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