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A Detection Method for Judging Cognitive User's Location in Cross-Channel Gain Estimation

A technology of cross-channel gain and cognitive user, applied in the field of cognitive radio full-duplex relay, mobile communication, can solve the problem of cross-channel gain estimation bottleneck, unable to guarantee PR reception signal, etc.

Inactive Publication Date: 2017-06-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual scenarios, we cannot guarantee that the delay of the PR received signal is within the control range, so this problem has also become the bottleneck of cross-channel gain estimation

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  • A Detection Method for Judging Cognitive User's Location in Cross-Channel Gain Estimation
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  • A Detection Method for Judging Cognitive User's Location in Cross-Channel Gain Estimation

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Embodiment Construction

[0058] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0059] Such as figure 1 as shown,

[0060] PT is at the center of a circle with radius R=0.5km, CT and PR are randomly distributed in the circle, and the distance from PT to CT is r km. To avoid the near-field effect, the distance between the three points must be greater than 0.035km. During the simulation, let the target signal-to-noise ratio The noise power is -114dBm, the number of blocks B=200, the number of samples in each block is 100, the number of Monte Carlo times M=1000, and the maximum tolerable delay is T m = 1 μs. The three-point wireless channel has large-scale fading and small-scale fading, and the small-scale obeys the Rayleigh distribution, and λ k =1, (k=0,1,2), the path loss is P L (dB)=128.1+37.6log 10 (d), for d≥0.035km, the shadow fading follows a lognormal distribution with a variance of 4. ...

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Abstract

The invention belongs to the field of mobile communication, in particular to the field of cognitive radio full-duplex relay in mobile communication. In the downlink transmission of the present invention, in the downlink transmission, the PT uses an adaptive modulation method to send data to the PR, and the signal-to-noise ratio is kept constant during the data transmission process, and the CT terminal monitors the SNR of the transmission signal from the PT terminal, compared with the PR Target SNR, exclude the area with interference, that is, initially detect the cognitive user area, CT acts as a full-duplex relay, forwards the signal from the PT to the PR, PR gives a new SNR based on the received two link signals, and triggers the PT ‑PR’s CLPC system, the PT transmit power will be adjusted accordingly, the CT will obtain a new SNR according to the received new PT signal, and the CT will detect the cognitive user area according to the change of the SNR before and after it is turned on. Using the method of the present invention, under the premise that the interference probability is 5%, as the PT-PR distance r changes, the successful selection probability is greater than 90%.

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 ten years, cognitive radio technology has been widely studied, and the spectrum sharing technology has become the most popular in the future cognitive radio system. In spectrum sharing, the cross-channel gain estimation from the CT end to the PR end is an important factor affecting cognitive performance. However, cross-channel gain estimation for CT-PR is still a very challenging task. Because in the frequency division duplex (FDD) system, the estimation of the CT-PR cross-channel gain can only be estimated by the existing PR, and then the estimated result is transmitted to the CT through the backhaul link between the two systems, However, in cognitive radio systems, this backhaul link is usually ineffective; in order to solve this problem, someone proposed a met...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382
Inventor 赵国栋黄碧佳李立英李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA