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

A method for estimating the number of users in the underlay spectrum sharing mode

A spectrum sharing and user technology, applied in the field of communication, can solve problems such as poor estimation performance

Active Publication Date: 2017-12-05
XIDIAN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few studies on the estimation of the number of time-frequency overlapping signals, and the estimation performance is poor in the case of low signal-to-noise ratio and high spectral overlap rate

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 method for estimating the number of users in the underlay spectrum sharing mode
  • A method for estimating the number of users in the underlay spectrum sharing mode
  • A method for estimating the number of users in the underlay spectrum sharing mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution, and provides detailed implementation and specific operation process, but the protection scope of the present invention is not limited to the present invention. Example.

[0058] Such as figure 1 As shown, the present invention is a method for estimating the number of user signals with a low signal-to-noise ratio and a high frequency spectrum overlap rate under the underlay spectrum sharing mode, and the method includes the following steps:

[0059] S1 performs dynamic delay extension on the received signal x(t) to obtain signal y(t).

[0060] It should be noted that the construction method of the signal y(t) in step S1 is as follows:

[0061] The signal model of the received signal is expressed as:

[0062]

[0063] Among them, s i (t) (i=1, ..., N) is the user signal component of time-fre...

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 estimating the number of users in an underlay spectrum sharing mode, comprising the following steps: performing dynamic delay extension on a received signal; performing singular value decomposition on the extended signal to obtain a singular value matrix of the extended signal, And extract the main diagonal vector of the singular value matrix; subtract the next element immediately next to the previous element in the main diagonal vector to construct the feature quantity ch1; divide the previous element in ch1 by the next next element , construct the feature quantity ch2; search for the maximum value in ch2, and estimate the number of users under the underlay spectrum sharing mode. Under the conditions of low signal-to-noise ratio and high spectrum overlap rate, the invention has good estimation performance for the number of users in the underlay spectrum sharing mode.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for estimating the number of users in an underlay spectrum sharing mode, which can be used for estimating the number of users under low signal-to-noise ratio and high frequency spectrum overlap rate. Background technique [0002] In the field of modern wireless communication, with the development of communication technology, spectrum resources become more and more tight. The underlay spectrum sharing method can enable primary users and secondary users to share the same frequency band, which is an effective way to solve the problem of spectrum resource shortage. In the underlay mode, each user signal forms a time-frequency overlapping signal, and the estimation of the number of users is the basis for subsequent estimation of modulation parameters of each independent signal, identification of modulation type and separation of mixed signals. Therefore, for the underl...

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): H04B17/382
Inventor 刘明骞陈健王江宏
Owner XIDIAN UNIV