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A radio frequency digital modulation method based on dds and dsp

A modulation method and radio frequency technology, applied in the direction of angle modulation components, etc., to achieve the effects of wide frequency band coverage, elimination of group delay, and low power consumption

Active Publication Date: 2017-11-03
SHAANXI FENGHUO ELECTRONICS
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Problems solved by technology

[0004] At present, in China, the method of realizing radio frequency digital modulation based on DDS and DSP has not been reported yet. The Chinese patent application No. 200910265030.4 discloses "a digital modulation signal generator based on DDS", but it only uses DDS to generate a digital Modulated signal, which is equivalent to a signal source, does not require input, only requires output result

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  • A radio frequency digital modulation method based on dds and dsp
  • A radio frequency digital modulation method based on dds and dsp
  • A radio frequency digital modulation method based on dds and dsp

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Embodiment Construction

[0025] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, the system or device corresponding to or used to realize the radio frequency digital modulation method of the present invention includes an audio amplification part, an audio sampling A / D converter part, a DSP operation and a preset DDS frequency control word part, and a DDS modulator part , low-noise phase-locked loop part, etc., wherein the audio sampling A / D converter includes FIR / IIR filter and interpolation / decimation filter.

[0027] Specifically, such as figure 2 As shown, the audio amplification part adopts an audio amplifier chip with voice compression, which is used to amplify the audio signal to be modulated to a certain amplitude. For FM, the frequency offset f of the modulated signal 频偏 With the amplitude of the audio signal V 音频 , and the general FM signal has a maximum frequency deviation f 频偏MAX req...

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Abstract

The invention provides a radio frequency digital modulation method based on DDS and DSP. The method includes: transmitting the digital signal obtained by the A / D converter to the DSP, and the DSP outputs the maximum sampling value and the digital signal according to the A / D converter. The instantaneous value of the signal, calculate the instantaneous frequency offset of the DDS, and calculate the instantaneous frequency control word of the DDS according to the number of bits of the DDS, the clock frequency and the RF carrier frequency, and the DDS performs frequency modulation on the RF signal according to the instantaneous frequency control word, Generate FM signal. The invention realizes a completely digital radio frequency modulation process. Compared with the analog modulation method, the circuit is relatively simple, has good consistency and high reliability, and is especially suitable for high-speed frequency-hopping transmission channels, such as high-speed frequency-hopping radio stations, and the frequency conversion time is short , high data transfer rate.

Description

technical field [0001] The invention belongs to the technical field of ultrashort wave radio communication, and relates to a digital modulation method of a transmission channel, in particular to a radio frequency digital modulation method based on DDS and DSP. Background technique [0002] In the prior art, the modulation system of ultra-short wave radio communication stations is usually frequency modulation system (FM). For the frequency modulation of analog signals such as analog voice signals, the analog voice signal is generally added to the voltage-controlled oscillator of the local oscillator phase-locked loop. On the one hand, the capacitance value of the varactor diode is changed according to the change of the amplitude of the audio signal, thereby controlling the output frequency of the local oscillator phase-locked loop to realize analog frequency modulation; in addition, with the development of digital signal processing technology, intermediate frequency digitizati...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03C3/09
Inventor 李关策马春利宋真东李宝正杨建平赵玉振刘静鱼勇
Owner SHAANXI FENGHUO ELECTRONICS
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