Method for realizing GMSK (Guassian Minimum Shift Keying) signal generator based on FPGA (Field Programmable Gate Array)

A signal generator and signal technology, applied in the field of communication, can solve the problems of low flexibility of analog circuit implementation, GMSK signal generator cannot adapt to the modernization needs of communication systems, etc., and achieve the effect of less resource occupation and fast implementation speed

Inactive Publication Date: 2013-03-20
TOEC TECH
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Problems solved by technology

[0006] GMSK signal generators are generally implemented by analog filters and voltage-controlled oscillators, but the implementation of analog circuits has low flexibility, and parameter configuration needs to be realized by changing off-chip hardware parameters
Due to the deve

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  • Method for realizing GMSK (Guassian Minimum Shift Keying) signal generator based on FPGA (Field Programmable Gate Array)
  • Method for realizing GMSK (Guassian Minimum Shift Keying) signal generator based on FPGA (Field Programmable Gate Array)
  • Method for realizing GMSK (Guassian Minimum Shift Keying) signal generator based on FPGA (Field Programmable Gate Array)

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[0020] Below in conjunction with accompanying drawing, the present invention will be further described: with reference to figure 1 and figure 2 , the method is to integrate NRZ encoding module, Gaussian filtering module, phase accumulation module, quadrature modulation module and D / A conversion module on the FPGA chip, and its method steps are as follows:

[0021] (1). NRZ encoding module encoding: encode the input digital signal. When the digital signal is 0, the corresponding strobe signal -1 is output as the signal of the NRZ encoding module; when the input signal is 1, the strobe signal +1 is used as NRZ encoding module signal output;

[0022] (2). Select the filtering method: the Gaussian filtering module includes two Gaussian filtering methods, one is the FIR digital filtering method, and the other is the filtering method based on waveform storage. According to different filtering requirements, through the control signal gating The switch SEL selects the filtering mod...

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Abstract

The invention relates to a method for realizing a GMSK (Guassian Minimum Shift Keying) signal generator based on an FPGA (Field Programmable Gate Array), which comprises the following steps: integrating an NRZ (Non-Return-to-Zero) coding module, a Gaussian filter module, a phase accumulation module, an orthogonal modulation module and a D/A (Digital to Analog) conversion module on an FPGA chip, filtering through NRZ coding and filtering mode selecting, accumulating a filtered signal into a phase value, carrying out two paths of ROM (Read Only Memory) table look-up on the phase value, multiplying a cosine value of one of the two paths by a coswt signal, multiplying a sine value of the other path by a sinwt signal and taking a difference between products of the two paths of signals as a generated GMSK modulation signal. The method has the beneficial effects that the signal modulated by the GMSK signal generator, which is realized by adopting the method, can select a filter with different filtering modes through flexibly controlling the switching of the filtering modes according to the filtering requirements of a system to realize the generation of a GMSK signal with different system bandwidth demands; and moreover, the method has the characteristics of high realization speed and less resources occupied, thereby satisfying the demand that the digital information processing system realizes the full digitalization of the GMSK signal generator.

Description

technical field [0001] The invention relates to a digital signal processing system in the communication field, in particular to a method for realizing a GMSK signal generator based on FPGA. Background technique [0002] Digital filters are usually applied to modify or change the properties of signals in the time domain or frequency domain. The most common digital filter is the linear time invariant (LTI) filter. According to the time characteristics of the unit impulse response h(n), LTI digital filters can be divided into two types: infinite unit impulse response (IIR) digital filter and finite unit impulse response (FIR) filter. [0003] The FIR (Finite Impulse Response) filter is the most basic component in a digital signal processing system. It can achieve arbitrary amplitude-frequency characteristics while ensuring strict linear phase characteristics. At the same time, its unit impulse response is limited and is not input to The output feedback stabilizes the system. ...

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Application Information

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IPC IPC(8): H03H17/00G05B19/042
Inventor 曹晓冬马彪张鹏泉李柬范玉进褚孝鹏张波李羚梅夏爽
Owner TOEC TECH
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