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SNR estimation method for PU receiver in cognitive radio system

A cognitive radio and signal-to-noise ratio estimation technology, applied in radio transmission systems, wireless communications, transmission systems, etc., can solve problems such as loop infeasibility

Inactive Publication Date: 2016-06-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

But in cognitive radios, such a loop is usually not feasible
So it is very challenging for CU to estimate the SNR of the main link

Method used

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  • SNR estimation method for PU receiver in cognitive radio system
  • SNR estimation method for PU receiver in cognitive radio system
  • SNR estimation method for PU receiver in cognitive radio system

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Embodiment Construction

[0039] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0040] Such as figure 1 As shown, the system has CLPC, PT and PR communicate in a certain frequency band, the PT position is fixed, and its coverage range R, then the center of the circle is PT, the circle with radius R is circle R, and PR is evenly distributed in the circle. At the same time, a CU wants to estimate the SNR of the main link at the PR for spectrum sharing in the downlink. The distance between CU and PT is r. use (k=0, 1 and 2) to represent the coefficients of the channel between the three nodes, where h k and g k represent the small-scale fading and large-scale path loss coefficients, respectively. In small-scale fading, the coefficient h k Rayleigh distribution with unit variance. In large-scale path loss, the coefficient g k can be expressed as g k (dB)=-128.1-κlog 10 (l), where κ=37.6 and l≥0...

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Abstract

The invention belongs to the field of mobile communication, and particularly relates to the field of cognitive radio full-duplex relays in mobile communication. The SNR estimation method takes a CU as a full-duplex AF relay of a PR, a point-to-point channel between a PT and the PR becomes a three-node relay channel, receiving signals of the PR is composed of two portions: one portion is direct transmission link signals from the PT, and the other portion is relay link signals from the CU. When the amplitude gain of the CU is large enough, a second hop link signal of the relay becomes very strong, thus the signals of a direct transmission link can be neglected, and the CU and the PR has the same SNR at the moment. Therefore, the CU obtains the SNR of the PR through measuring the SNR from PT signals received by the CU. CLPT is adopted, the PT automatically maintains the SNR at the PR end as a target SNR, the SNR measured at the CU end equals the target SNR of the PR, namely a main link SNR. The SNR estimation method can effectively estimate the target SNR of the link when a G value is large.

Description

technical field [0001] The invention belongs to the field of mobile communication, in particular to the field of cognitive radio full-duplex relay in mobile communication. Background technique [0002] In the past decade, spectrum sensing techniques in cognitive radio networks have been extensively studied and are very important for spectrum sharing. Recently, estimating the signal-to-noise ratio (SNR) of the cross-link, that is, the ratio of the power of the main-link signal to the power of the interfering signal received by a cognitive user CU, has become a very attractive problem. The SNR information of the cross-link is very important for the cognitive power control room. This is because the SNR of the cross-link corresponds to the distance between the primary transmitter PT and the cognitive user CU, and it further indicates the interference that the CU may cause to the primary receiver PR: If the PT-CU distance If the distance between PT and CU is very large, then th...

Claims

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Application Information

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IPC IPC(8): H04W52/08H04W52/24H04B7/155H04B17/29H04B17/336
CPCH04W52/08H04B7/15535H04B17/29H04B17/336H04W52/241
Inventor 赵国栋黄碧佳李立英陈智欧振威
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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