A fast automatic gain control circuit and method for ofdm system

A fast automatic gain control technology, applied in the transmission system, multi-frequency code system, baseband system components, etc., can solve the problems of gain value jitter, AGC does not take into account empty time slots, and cannot quickly adjust gain parameters, etc., to achieve The effect of reducing quantization error

Inactive Publication Date: 2017-07-28
FUDAN UNIV
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the traditional AGC adopts the fixed step adjustment method. When encountering a large channel change, the gain parameter cannot be adjusted quickly, and it takes a long time to converge to a stable value; and the fixed step adjustment method is easy to cause the gain value to jitter.
In addition, since traditional AGC does not consider the problem of empty time slots, unnecessary adjustments to time slots without actual data transmission may lead to an increase in the bit error rate of the system

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
  • A fast automatic gain control circuit and method for ofdm system
  • A fast automatic gain control circuit and method for ofdm system
  • A fast automatic gain control circuit and method for ofdm system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further specifically described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 As shown, it is an OFDM receiver with an AGC circuit module. Among them, the AGC circuit module is composed of an analog amplifier and a gain adjustment part; the analog amplifier part is set before the A / D module of the OFDM receiver, and is used to amplify the signal received by the antenna, so that the dynamic range of the received signal is stabilized at A fixed range to prevent signal loss caused by too small received signal and saturation distortion caused by too large received signal; the gain adjustment part is set after the A / D module of the OFDM receiver for receiving the A / D of the OFDM receiver The output signal of the module, and the signal level is calculated and compared, and the gain value of the analog amplifier is adjusted to cope with the change of the dynamic range of the received signal caused b...

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

The invention belongs to the technical field of wireless communication, and particularly relates to a rapid automatic gain control method based on an OFDM (orthogonal frequency division multiplexing) system. An OFDM receiver model based on an AGC (automatic gain control) module is used, attenuation and distortion of received signals are unavoidable due to complex and changeful transmission channels in the transmission process of OFDM signals, and the AGC module is generated to solve the problem of signal attenuation. However, traditional AGC has the shortcomings of low convergence speed, gain jitter and incorrect empty time slot adjustment. The novel rapid automatic gain control method can effectively overcome the three shortcomings, and simulation is correspondingly performed. A device comprises a gain adjustment portion and an analog amplifier based on an OFDM receiver module with the AGC module.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a fast automatic gain control circuit and method for an OFDM system. Background technique [0002] The future development and evolution of the fourth generation mobile communication system (4G) has become a hot topic in current research. Among the key technologies adopted by 4G, OFDM technology is undoubtedly the most important. The main idea of ​​OFDM technology is to divide a given channel into many narrow orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel, so the interference between signal waveforms can be greatly eliminated . OFDM can also adaptively distribute transmission loads on different sub-channels, so as to optimize the overall transmission rate. In addition, OFDM can resist frequency selective fading or narrowband interference. In the OFDM sys...

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 Patents(China)
IPC IPC(8): H04B1/16H04L27/26H04L25/03
Inventor 赵鑫刘俊周小林包晓晶
Owner FUDAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap