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

Signal-to-noise ratio estimating method of time frequency overlapping OFDM signals under frequency spectrum sharing mode

A technology of signal-to-noise ratio estimation and spectrum sharing, which is applied in the field of communication to achieve the effect of good estimation performance

Active Publication Date: 2017-06-13
XIDIAN UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problem existing in the existing technology is: due to the coexistence of the primary user and multiple secondary users, which overlap in the time domain and frequency domain, it is impossible to directly process the signal from the time domain, frequency domain or space domain to perform signal-to-noise ratio analysis. Therefore, the existing technology cannot estimate the signal-to-noise ratio of time-frequency overlapping OFDM signals in underlay cognitive radio

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
  • Signal-to-noise ratio estimating method of time frequency overlapping OFDM signals under frequency spectrum sharing mode
  • Signal-to-noise ratio estimating method of time frequency overlapping OFDM signals under frequency spectrum sharing mode
  • Signal-to-noise ratio estimating method of time frequency overlapping OFDM signals under frequency spectrum sharing mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] Such as figure 1 As shown, the method for estimating the signal-to-noise ratio of the time-frequency overlapping OFDM signal under the spectrum sharing mode provided by the embodiment of the present invention includes the following steps:

[0032] S101: Calculate the cyclic autocorrelation function of the received time-frequency overlapped OFDM signal, and when the oversampling rates of the component signals are equal or unequal, respectively intercept the cross-sections whose ...

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 communication, and discloses a signal-to-noise ratio estimating method of time frequency overlapping OFDM signals under a frequency spectrum sharing mode. The method comprises the steps of firstly computing a cyclic autocorrelation function of received time frequency overlapping OFDM signals, capturing a cross section in which delay is less than chip time when oversampling ratios of component signals are equal or unequal, and then estimating overall power of the component OFDM signals by extracting a discrete spectrum line from the cross section; and at last estimating the overall power of the received signals according to values of the cyclic autocorrelation function when both the delay and cycle frequency are zero, thus estimating a signal-to-noise ratio of the time frequency overlapping OFDM signals. According to the method provided by the invention, the signal-to-noise ratio of the time frequency overlapping OFDM signals can be effectively estimated; not only the signal-to-noise ratio of the time frequency overlapping OFDM signals can be estimated, but also prior parameters such as the oversampling ratio and the chip time of the component signals can also be estimated.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a method for estimating the signal-to-noise ratio of a time-frequency overlapping OFDM signal in a spectrum sharing manner. Background technique [0002] Underlay spectrum sharing technology improves spectrum utilization by sharing spectrum resources between primary users and secondary users, and has gradually become a hot spot in cognitive radio research. Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in cognitive radio because of its efficient spectrum utilization and anti-fading performance. In underlay cognitive OFDM, when the secondary user does not exceed the interference temperature of the primary user, it can share spectrum resources with the primary user at the same time, and the signal in the frequency band is an OFDM signal with time-frequency overlap, where the interference temperature measurement is the underlay cognitive One of th...

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): H04B17/336H04B17/382
CPCH04B17/336H04B17/382
Inventor 李兵兵郭菲刘明骞
Owner XIDIAN UNIV
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