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Demodulator Device Based on Adaptive Equalization and Frequency Calibration Function

An adaptive equalizer and demodulator technology, applied in the direction of modulation conversion balance device, etc., can solve problems such as weak anti-frequency offset ability, and achieve the effect of improving reliability, reducing dependence and reducing cost

Active Publication Date: 2017-08-25
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, in microwave and other high-frequency communication systems, the frequency deviation can reach several kHz or even dozens of kHz, the traditional adaptive equalizer has weak anti-frequency deviation ability, which can only be solved by reducing the rate or improving the stability of the clock source.

Method used

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  • Demodulator Device Based on Adaptive Equalization and Frequency Calibration Function
  • Demodulator Device Based on Adaptive Equalization and Frequency Calibration Function

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Embodiment Construction

[0013] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0014] refer to Figure 1 to Figure 2 , The present invention consists of A / D converter 1, digital down-conversion 2, NCO3, Costas loop 4, interpolation filter 5, timing extraction 6, adaptive equalizer 7 and power supply 8. figure 1 It is a block diagram of the electrical principle of the present invention, and the embodiment is based on figure 1 Connect the lines. The function of A / D converter 1 is to sample the received low-IF signal, convert the analog signal into a digital signal, and then output it to digital down-conversion 2; the function of digital down-conversion 2 is to multiply the low-IF signal by NCO3. It is converted into a baseband signal, and the baseband signal is subjected to low-pass filtering, and then output to the Costas loop 4; the Costas loop 4 is a decision feedback loop, and the present invention directly uses the sq...

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PUM

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Abstract

The invention discloses a demodulator device based on adaptive equalization and having a frequency calibration function, and relates to the field of wireless communication. In the demodulator device of the present invention, a Costas ring is added to the front end of the self-adaptive equalizer, and the anti-large frequency deviation characteristic of the Costas ring is utilized, so that the demodulator can have the function of removing intersymbol interference when there is a large frequency deviation . After the demodulator receives the baseband signal output through digital down-conversion and low-pass filtering, it first uses the Costas ring to eliminate the frequency offset caused by different clock sources at the two ends of the transceiver, and then uses an adaptive equalizer to eliminate the adjacent codes. Intersymbol interference between elements. The device has the characteristics of high stability, good reusability and excellent performance without requiring clock sources at both ends of the communication, and is especially suitable for high-speed communication of wireless channels such as microwave communication and scattering communication.

Description

technical field [0001] The invention relates to a demodulator device based on self-adaptive equalization and with frequency correction function under the conditions of high-speed transmission, deep fading and large frequency deviation in the field of wireless communication. It is especially suitable for demodulation in wireless communication with fading and large frequency offset. Background technique [0002] For high-speed wireless communication systems, the difficulty lies in eliminating inter-symbol crosstalk and resisting large frequency offsets. Usually, in high-frequency communication systems such as microwaves, the frequency offset can reach several kHz or even tens of kHz. The traditional adaptive equalizer has weak anti-frequency offset capability and can only be solved by reducing the rate or improving the stability of the clock source. The demodulator based on self-adaptive equalization and with frequency correction function has broad application prospects. SU...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/14
Inventor 石柳王伟
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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