Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

OFDM optical fiber wireless communication method and system based on IRA codes

A wireless communication system and wireless communication technology, applied in the direction of optical fiber radio, multi-frequency code system, baseband system components, etc., can solve the problems of limiting signal transmission bandwidth, shortening signal transmission distance, and reducing carrier-to-noise ratio, etc. Peak-to-average power ratio, extended transmission distance without repeaters, and performance-enhancing effects

Inactive Publication Date: 2013-08-21
GUILIN UNIV OF ELECTRONIC TECH
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The transmission of high-frequency microwave and millimeter wave signals on optical fibers is affected by dispersion, which limits the transmission bandwidth of signals
The increase in transmission bandwidth increases the phase shift due to dispersion between the highest and lowest frequencies of the signal, resulting in a shorter signal transmission distance
When the frequency of the radio frequency signal exceeds 20GHz, the fiber dispersion causes the carrier-to-noise ratio of the system to drop rapidly, which becomes the most important factor limiting the signal transmission distance

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
  • OFDM optical fiber wireless communication method and system based on IRA codes
  • OFDM optical fiber wireless communication method and system based on IRA codes
  • OFDM optical fiber wireless communication method and system based on IRA codes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0055] see figure 1 , an OFDM optical fiber wireless communication system based on IRA codes, such as figure 1 As shown, it is mainly composed of OFDM transmitter, central station, base station, subscriber unit and OFDM receiver. in

[0056] The OFDM transmitter includes an IRA encoder, a first serial-to-parallel conversion module, a 16QAM modulator, a pilot insertion module, an inverse Fourier transform module, a guard interval insertion module, a first parallel-to-serial conversion module and a digital-to-analog conversion module. The input end of the IRA encoder is connected to the input random sequence, and the output end of the IRA encoder passes through the first serial-to-parallel conversion module, the 16QAM modulator, the pilot insertion module, the inverse Fourier transform module, the guard interval insertion module, and the second A parallel-to-serial conversion module is connected to the input end of the digital-to-analog conversion module.

[0057] The central...

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 discloses an OFDM optical fiber wireless communication method and system based on IRA codes. IRA encoding is firstly carried out on bit information of an OFDM transmitter provided with an IRA encoder, OFDM selective mapping modulation is then carried out on the bit information of the OFDM transmitter provided with the IRA encoder, and data which are modulated are used as channel observed values by an OFDM receiver provided with the IRA decoder to carry out IRA iterative decoding. The OFDM optical fiber wireless communication method and system based on the IRS codes has the advantages that compared with other channel encoding, the IRA codes are better in performance, and decoding complexity is lower. In addition, an accumulator in the IRA encoding is a linear feedback shift register and can be used as a scrambler, a selective mapping technology is further combined, the peak average power ratio of OEDM can be effectively lowered, the non-relay transmission distance of signals is prolonged, and the system performance is greatly improved.

Description

technical field [0001] The present invention relates to the field of optical fiber wireless communication (Radio over Fiber, RoF) based on coded OFDM, in particular to an OFDM optical fiber wireless communication method and system based on IRA (Irregular Repeat Accumulate, Irregular Repeat Accumulate) code. Background technique [0002] With the rapid development of communication technology, high-speed broadband and highly mobile communication methods have become an urgent need for people, so people gradually shift their attention to millimeter wave communication. Due to the large loss of the millimeter wave signal in the air, it is not suitable for long-distance transmission, so people have proposed optical fiber wireless communication. The central idea of ​​the optical fiber wireless communication system is to modulate high-frequency microwave and millimeter-wave signals onto light, transmit them to the base station using optical fibers, and then perform photoelectric 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): H04B10/2575H04L27/26H04L25/03
Inventor 陈明聂娟罗登李海鸥陈辉
Owner GUILIN UNIV OF ELECTRONIC TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com