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A digital fm signal demodulator with instantaneous agc

A signal demodulator, real-time digital technology, applied in the field of signal demodulation, can solve the problem of high demodulation bit error rate

Active Publication Date: 2017-02-15
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem of high demodulation bit error rate caused by small quantization amplitude of FM signal through real-time adjustment of signal quantization amplitude by instantaneous AGC, and improves demodulation accuracy rate

Method used

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  • A digital fm signal demodulator with instantaneous agc
  • A digital fm signal demodulator with instantaneous agc
  • A digital fm signal demodulator with instantaneous agc

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Embodiment 1

[0048] Based on the invention, a digital FM demodulator with instantaneous AGC function is realized, and a lower bit error rate is achieved. The specific implementation examples are as follows:

[0049] 1) Implementation conditions:

[0050] Signal generator: Agilent 4438C;

[0051] IF signal carrier frequency 70MHz;

[0052] ADC sampling rate 1G / s;

[0053] FM signal code rates are 100kb / s, 2Mb / s, 15.5Mb / s;

[0054] The signal power injected by each code rate is -10dBm, 0dBm respectively;

[0055] 2) The measured bit error rates are shown in the table below:

[0056] Table 1 Comparison of BER when the symbol rate is 100kb / s

[0057]

[0058] Table 2 Comparison of BER when the symbol rate is 2Mb / s

[0059]

[0060] Table 3 Bit error rate comparison when the symbol rate is 15.5Mb / s

[0061]

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Abstract

The invention relates to the field of signal demodulation, in particular to a digital FM signal demodulator with instant AGC. The digital FM signal demodulator with instant AGC aims to solve the existing technical problems. Through real-time modulation on signal quantization amplitude by means of the instant AGC, the digital FM signal demodulator solves the problem that demodulation is high in error rate due to small FM signal quantization amplitude, and increases the accurate rate of demodulation. The digital FM signal demodulator with instant AGC comprises an ADC unit, an orthorhombic dual-channel digital downconversion unit, an extraction and filtration unit, an instant AGC unit and the like. Intermediate frequency signals generated by a signal generator are input into the ADC unit and quantized into digital signals through the ADC unit, and then the digital signals pass through the orthorhombic dual-channel digital downconversion unit, the extraction and filtration unit, the instant AGC unit and the like in sequence, wherein the instant AGC unit increases the number of quantization significance bits of I(n) and Q(n) signals to the value of the most significant bit allowed by a CORDIC module by detecting the number of quantization sign bits of the I(n) and Q(n) signals, and the error rate of demodulation is lowered effectively.

Description

technical field [0001] The invention relates to the field of signal demodulation, in particular to a digital FM signal demodulator with instantaneous AGC. Background technique [0002] Because FM modulation has superior anti-noise performance, FM modulation technology is widely used in modern communication systems. [0003] In traditional analog demodulation, there are many ways to recover the original signal from the FM signal. The purpose of all FM demodulators is to produce the opposite transfer characteristic of a frequency modulator. That is to say, the output voltage of the frequency demodulator should be directly proportional to the instantaneous frequency of the input FM signal. Such a frequency-amplitude conversion circuit is a frequency demodulator. [0004] It has a variety of different techniques, including slope detection, zero-crossing detection, phase-locked loop phase detection and integral detection. [0005] Slope detection is to demodulate the FM signa...

Claims

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Application Information

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IPC IPC(8): H03D7/16H03G3/20H04L27/14
Inventor 喻令向川云刘宪军
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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