Unlock instant, AI-driven research and patent intelligence for your innovation.

Demodulation circuit and demodulation method

A technology for demodulating circuits and circuits, applied in electrical components, modulated carrier systems, digital transmission systems, etc., can solve problems such as reduced signal accuracy

Inactive Publication Date: 2007-07-25
FUJITSU MICROELECTRONICS LTD
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, because the useful wave is amplified after being attenuated, there is a problem of reduced signal accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Demodulation circuit and demodulation method
  • Demodulation circuit and demodulation method
  • Demodulation circuit and demodulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0061] A demodulation circuit according to a first aspect of the present invention is a demodulation circuit for demodulating a signal, including: an automatic equalizer for performing equalization processing on a signal, and an automatic equalizer for equalizing a signal from the automatic equalizer A carrier recovery circuit that performs carrier recovery control, in which a center tap for performing amplitude control to an automatic equalizer is placed on an input side of the automatic equalizer, and a control signal for the center tap is sent from the automatic equalizer.

[0062] Here, the tap used to control the data amplitude at the current clock time in the automatic equalizer (i.e., the center tap) is placed on the input side of the automatic equalizer, and the tap coefficient provided for this tap (i.e., the data amplitude at the current clock time) Output from the automatic equalizer, so that the signal equalization processing also realizes the dual function of signa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A demodulation circuit according to the present invention comprises an automatic equalizer for carrying out equalization processing of a signal, a carrier recovery circuit for carrying out carrier recovery processing based on an equalized signal by the automatic equalizer. A center tap for carrying out an amplitude control of the automatic equalizer is placed on an input side thereof, and a control signal to the center tap is transmitted from the automatic equalizer.

Description

technical field [0001] The present invention relates to a demodulation circuit and a demodulation method, and more particularly, to a demodulation circuit and a demodulation method that realize miniaturization of the circuit scale while ensuring the accuracy of amplitude control. Background technique [0002] One system for modulating transmitted data is the Quadrature Amplitude Modulation (QAM) system. This modulation system is such that 2 on the IQ phase plane (that is, the plane including the I channel signal as the horizontal axis and the Q channel signal as the vertical axis) n signal points corresponding to 2 n A modulation system of symbols. The transmitting side obtains an I-channel signal and a Q-channel signal by multiplying mutually orthogonal carrier and sub-carriers, and transmits a signal by adding the above two signals. [0003] FIG. 1 is a block diagram showing the configuration of a QAM receiver (ie, a QAM demodulation circuit) according to the first conv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38H04B1/06H04L7/02
CPCH04L27/0002H04L27/3872H04L7/0029H04L25/0305H04L27/01H04L27/38
Inventor 橘田辰昭岩松隆则
Owner FUJITSU MICROELECTRONICS LTD