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Adaptive demodulation system for analog signal and implementation method

An analog signal and demodulation system technology, applied in the modulation carrier system, transmission system, digital transmission system and other directions, can solve the problem of demodulation output distortion and other problems, and achieve the effect of flexible implementation

Inactive Publication Date: 2016-08-03
TOEC TECH
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Problems solved by technology

[0002] The coherent demodulation method is often used in analog demodulation circuits, which refers to the decoherent demodulation of a local carrier with the same frequency and direction. When the same frequency and direction are not satisfied, the demodulation output will be severely distorted.

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  • Adaptive demodulation system for analog signal and implementation method
  • Adaptive demodulation system for analog signal and implementation method
  • Adaptive demodulation system for analog signal and implementation method

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0012] Such as figure 1 As shown, an analog signal adaptive demodulation system includes a front panel, a signal processing board, and a receiver. The circuit connection of the signal processing board is that the FPGA is connected to the ARM processor and the input filter in one direction, and the configuration chip and the crystal oscillator are respectively connected to the FPGA is unidirectionally connected, ARM processor and network port chip are bidirectionally connected to the interface MCU, the interface MCU is bidirectionally connected to the FPGA, the input filter is unidirectionally connected to the ADC, and the ADC is bidirectionally connected to the FPGA; the front panel includes a bidirectional connection between the control panel and the signal source. The control panel on the front panel is connected bidirectionally to the int...

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Abstract

The invention relates to an analog signal self-adaptive demodulation system and its implementation method, comprising a front panel, a signal processing board, and a receiver. The chip and the crystal oscillator are connected to the FPGA in one direction, the ARM processor and the network port chip are connected to the interface MCU in two directions, the interface MCU is connected to the FPGA in two directions, the input filter is connected to the ADC in one direction, and the ADC is connected to the FPGA in two directions. The panel is bidirectionally connected to the interface MCU, the signal source is bidirectionally connected to the network port chip, and the receiver is unidirectionally connected to the input filter. The demodulation module performs orthogonal decomposition on the sampling signal, and the sine and cosine signals generated by the numerical control oscillator are respectively multiplied by the sampling signal to obtain I The quadrature signal of channel Q and channel Q are filtered out by low-pass filter to remove high-frequency components, and then extract and reduce the speed to demodulate the modulated signal, and the result is output through the standard interface to realize automatic identification of signal modulation style and carrier synchronization , bit synchronization, frame synchronization.

Description

technical field [0001] The invention relates to an analog signal demodulation system and a realization method, in particular to an analog signal adaptive demodulation system and a realization method. Background technique [0002] The coherent demodulation method is often used in analog demodulation circuits, which refers to the decoherent demodulation of a local carrier with the same frequency and direction. When the same frequency and direction are not satisfied, the demodulation output will be severely distorted. For example, in mobile communication, when the received signal is seriously fading, the quality of the extracted carrier is often not up to the requirement, especially in the frequency offset environment caused by the Doppler effect. [0003] Software radio (softradio) constructs an open, standardized, and modular general-purpose hardware platform, and uses software to complete various functions, such as working frequency bands, modulation and demodulation types, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0002H04L27/0012
Inventor 张鹏泉王保文陈艳超孔云苍吴岩磊杨新辉
Owner TOEC TECH
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