Digital up/down frequency conversion system and implementation method thereof

A frequency conversion system, digital technology, applied in the transmission system, baseband system components, multi-frequency modulation conversion, etc., can solve the problem of reducing the application range of the digital system, and achieve the effect of fewer calculation times and less storage units

Inactive Publication Date: 2011-02-16
COMBA TELECOM SYST CHINA LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using traditional digital up and down conversion technology greatly reduces the application range of digital systems

Method used

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  • Digital up/down frequency conversion system and implementation method thereof
  • Digital up/down frequency conversion system and implementation method thereof
  • Digital up/down frequency conversion system and implementation method thereof

Examples

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Embodiment 1

[0032] Such as figure 1 As shown, the digital up- and down-conversion system consists of A / D conversion module 11, down-conversion frequency mixing processing module 12, down-conversion digital local oscillator module 13, decimation filter system 14, digital frequency selection filter system 15, and interpolation filter system 16. An up-conversion and frequency-mixing processing module 17 , an up-conversion digital local oscillator module 18 and a D / A conversion module 19 are jointly formed. The output end of the A / D conversion module 11 passes through the down conversion frequency mixing processing module 12, the decimation filter system 14, the digital frequency selection filter system 15, the interpolation filter system 16 and the up conversion frequency mixing processing module 17 and the D / A The input end of conversion module 19 is connected; Simultaneously, the output end of described down-conversion digital local oscillator module 13 is connected with the input end of d...

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Abstract

The invention relates to a digital up/down frequency conversion system and an implementation method thereof. The system comprises an A/D conversion module, a down frequency conversion mixing processing module, an extraction filtering system, a digital frequency-selecting filtering system, an interpolation filtering system, an up frequency conversion mixing processing module, a D/A conversion module, a down frequency conversion digital local oscillation module and an up frequency conversion digital local oscillation module, wherein the digital frequency-selecting filtering system comprises a frequency-selecting filtering system protection module for preventing the system from generating a limit cycle phenomenon and excessive oscillation, a shunt, a frequency-selecting filtering module for frequency-selecting filtering and filtering the signal out of band, and a multiplexer; and the output end of the frequency-selecting filtering system protection module is successively connected with the input end of the multiplexer through the shunt and the frequency-selecting filtering module. The invention has the advantages that the transmission time delay in the digital system is effectively reduced, and the transmission time delay is extremely low.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a digital up-down conversion system and a realization method thereof. Background technique [0002] At present, in the analog repeater and carrier pool system of communication systems such as GSM, CDMA and WCDMA, the intermediate frequency demodulation mainly adopts the method of analog complex demodulation. Orthogonal IF carrier signal, the input IF signal is multiplied by two orthogonal IF carrier signals through an analog multiplier to realize the shift of the input signal in the frequency domain, and then the I and Q two signals are obtained through an analog low-pass filter. The subgrade carries the signal, so as to realize the down-conversion and transfer of the signal, and obtain two orthogonal signals. The analog complex modulation is that the baseband signal is similarly mixed and filtered by an analog bandpass filter to obtain a corresponding modulated sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H03D7/16H04L25/02
Inventor 苗龙杨林军
Owner COMBA TELECOM SYST CHINA LTD
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