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Rapid link establishing method based on spectrum prediction

A spectrum prediction and establishment method technology, applied in the field of short-wave communication, can solve the problems of data transmission energy waste, etc., achieve the effect of reducing link establishment time, increasing the probability of successful link establishment, and narrowing the frequency range

Active Publication Date: 2018-10-26
ARMY ENG UNIV OF PLA
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Problems solved by technology

This communication system combining real-time frequency selection and automatic link establishment can better find the real-time optimal frequency and improve the utilization rate of the shortwave frequency band, but the disadvantage is that the time overhead for perception and the data for link quality analysis will be As the number of channels increases exponentially, and when the communication traffic in the frequency band is high, frequent channel switching reduces the throughput of data transmission and causes energy waste

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  • Rapid link establishing method based on spectrum prediction
  • Rapid link establishing method based on spectrum prediction
  • Rapid link establishing method based on spectrum prediction

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Embodiment 1

[0049] A specific embodiment of the present invention is described as follows, the system simulation adopts Matlab software, and the parameter setting does not affect the generality. The scene sets the channel noise to obey a Gaussian distribution with a mean of 0 and a variance of 1. Different instantaneous SNR simulation values ​​are generated through the Rayleigh fading channel model. The average SNR of each channel is between 0db and -10db. Simulation settings signal bandwidth 24kHz, frame length T f =4.8s, spectrum sensing duration t s =40ms, channel switching time t c = 10ms, channel detection time t d =100ms, user access duration t a =100ms, spectrum prediction duration t p = 10ms.

[0050] image 3 Set the predicted false alarm probability Predict the probability of missed detection image 3 (a)-(d) show that when the number of idle channels accounts for 20%, 40%, 60%, and 80% of the total number of channels, the ALE method based on multi-channel sensing ord...

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Abstract

The invention discloses a rapid link establishing method based on spectrum prediction. The method includes the following steps: a set of idle channels is predicted at the next moment in a neural network manner based on historical spectrum sensing data; a multi-channel perception order optimization criterion is constructed by combining spectrum prediction with channel quality historical data, and the predicted idle channels are sorted by using the multi-channel perception order optimization criterion; a top ranked channel is selected for real-time spectrum sensing and channel detection, a truechannel state and channel quality are obtained, if perceived channel is idle and channel detection SNR is greater than a threshold value SNR0, a primary call party initiates calling to establish a communication link, and next channel is switched if requirements are not satisfied; and for throughput requirements in an actual system, link establishing time of a user is calculated by utilizing a rapid link establishment algorithm. Through adoption of the method of the invention, idle channel resources can be discovered more quickly in spectrum, and the link establishing time of the short-wave communication is reduced by narrowing a perceived frequency range.

Description

technical field [0001] The invention belongs to the technical field of short-wave communication, in particular to a method for quickly establishing a link based on frequency spectrum prediction. Background technique [0002] Shortwave communication relies on 1.5-30MHz electromagnetic waves for signal transmission, which is the earliest and widely used wireless communication method. Affected by the ionosphere, changes in shortwave channels are random. The low data transmission rate caused by poor channel conditions and the serious interference caused by narrow shortwave frequency bands and multiple types of services have become problems that need to be solved urgently. In recent years, with the deepening of the concept of dynamic spectrum access, the potential application of cognitive radio technology (CR) in next-generation automatic link establishment has attracted increasing attention. CR can dynamically monitor the spectrum environment, fully exploit high-quality channel...

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Application Information

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IPC IPC(8): H04W16/14H04W76/10
CPCH04W16/14H04W76/10Y02D30/70
Inventor 王金龙程云鹏吴楚捷丁国如郑学强於凌
Owner ARMY ENG UNIV OF PLA
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