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Method for estimating user amount in underlay frequency spectrum sharing manner

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

Active Publication Date: 2016-01-13
XIDIAN UNIV
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  • 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

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  • Method for estimating user amount in underlay frequency spectrum sharing manner
  • Method for estimating user amount in underlay frequency spectrum sharing manner
  • Method for estimating user amount in underlay frequency spectrum sharing manner

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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] x ( t ) = ...

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Abstract

The invention discloses a method for estimating the user amount in the underlay frequency spectrum sharing manner. The method comprises the following steps that dynamic delayed expansion is implemented on a received signal; singular value deposition is carried out on the expanded signal to obtain a singular value matrix of the expanded signal, and a main diagonal vector of the singular value matrix is extracted; in the main diagonal vector, a latter element is subtracted from a former neighboring element to form a characteristic quantity ch1; in the ch1, a former element is divided by a neighboring latter element to form a characteristic quantity ch2; and the maximal value of the ch2 is searched to estimate the user amount in the underlay frequency spectrum sharing manner. The user amount in the underlay frequency spectrum sharing manner can be effectively estimated under low signal to noise ratio and high frequency spectrum overlapping ratio.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
Inventor 刘明骞陈健王江宏
Owner XIDIAN UNIV