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

Method for computing carrier jamming noise ratio under OFDM

A technology of orthogonal frequency division and carrier interference, applied in the field of communication, can solve the problems of inability to resist frequency selective fading and channel time variation

Inactive Publication Date: 2011-09-21
ZTE CORP
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The present invention provides a method for calculating carrier-to-interference-noise ratio under orthogonal frequency division multiplexing, which is used to solve the problem that the calculation of carrier-to-interference-noise ratio in the prior art cannot resist frequency selective fading and channel time variation

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
  • Method for computing carrier jamming noise ratio under OFDM
  • Method for computing carrier jamming noise ratio under OFDM
  • Method for computing carrier jamming noise ratio under OFDM

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The method described in the embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] First, the method described in the first embodiment of the present invention will be described in detail.

[0036] Such as figure 1 as shown, figure 1 It is a schematic diagram of the time-frequency unit structure in the 802.16e uplink PUSC mode. A tile is a time-frequency unit, and a tile contains 12 subcarriers, including 4 pilot subcarriers and 8 data subcarriers. Wherein the first OFDM symbol and the third contain pilot subcarriers, and all subcarriers in the second OFDM symbol are data subcarriers. Wherein, P represents a pilot subcarrier, and D represents a data subcarrier. Depend on figure 1 It can be seen that P 1 and P 2 is the pilot subcarrier in the first OFDM symbol, P 3 and P 4 is the pilot subcarrier in the third OFDM symbol, and the remaining subcarriers are data (D 1 ~D 8 ).

[0037] Such as...

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 a method for measuring carrier interference noise ratio under orthogonal frequency division multiplexing, which comprises getting a plurality of pilot subcarrier groups through choosing composition modes of pilot subcarrier groups in a plurality of time-frequency unit, calculating channel response value of pilot subcarrier of the pilot subcarrier groups to each pilot subcarrier group, calculating signal efficiency which is corresponded with the channel response value of the pilot subcarrier groups and disturbance and noise efficiency according to the channel response value according to the pilot subcarrier, calculating to get carrier interference noise ratio according to the sum of signal efficiencies of a plurality of pilot subcarriers and the sum of the disturbance and noise efficiency of the pilot subcarrier groups. The invention overcomes the shortcomings that in the prior art, the calculation of carrier interference noise ratio which is caused by frequency which is selective fading and channel time-varying is accurate through processing pilot frequency signals which are received on the adjacent pilot subcarriers.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for calculating carrier-to-interference-noise ratio under orthogonal frequency division multiplexing. Background technique [0002] In recent years, OFDM (Orthogonal Frequency Division Multiplexing) technology has been used for high-speed data transmission through wired / wireless channels. The OFDM technology converts the input serial data into parallel transmission data, and modulates the parallel data onto multiple sub-carriers, that is, sub-channels with orthogonality, and then transmits the modulated data. [0003] This OFDM technology is widely applied to digital transmission technologies, such as digital / audio broadcasting, digital TV, wireless local area network (WLAN), wireless asynchronous transfer mode (WATM), broadband wireless access (BWA) and so on. [0004] For a system based on OFDM technology, a very important reference index in AMC (adaptive codin...

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): H04L27/26H04J11/00
Inventor 张磊李玉洁刘巧艳赵路
Owner ZTE CORP
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