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Authorization user parameter estimation method based on cooperation perception in cognitive radio system

A cognitive radio, authorized user technology, applied in the field of authorized user parameter estimation based on cooperative sensing method, can solve the problem of no real-time and effective estimation method, etc.

Active Publication Date: 2015-10-21
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to solve the problem of cognitive users estimating authorized user parameters under the condition of low signal-to-noise ratio in the cognitive radio system and solve the existing problems in the existing cognitive radio spectrum switching (cognitive users use assumptions or long-term statistics to obtain authorized user parameters, but there is no instant and effective estimation method), thus a method for estimating authorized user parameters based on cooperative sensing in cognitive radio systems is proposed

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  • Authorization user parameter estimation method based on cooperation perception in cognitive radio system
  • Authorization user parameter estimation method based on cooperation perception in cognitive radio system
  • Authorization user parameter estimation method based on cooperation perception in cognitive radio system

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[0027] combine figure 1 Describe the specific embodiment of the present invention, a method for estimating authorized user parameters based on cooperative sensing in a cognitive radio system, which is implemented by the following steps:

[0028] Step 1. Use the queuing model to model and analyze each authorized channel. Assume that the arrival rate of authorized users obeys the Poisson distribution, the window service rate satisfies the exponential distribution, and each channel has only one window for service at the same time. The channel buffer capacity is Authorized users are subject to a "first come, first served" basis. Assume Indicates the state of the authorized channel, that is, the number of authorized users in the authorized system. when when λ c Indicates the arrival rate of the authorized channel state from c to c+1; when when μ c Indicates the service rate of the authorized channel state from c to c-1. At this time, let The stable channel state probab...

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Abstract

The invention provides an authorization user parameter estimation method based on cooperation perception in a cognitive radio system and relates to the parameter estimation field in cognitive radio communication systems. Thus, cognitive users are capable of estimating authorization user parameters in a condition of low signal-to-noise ration in a cognitive radio system. Based on cooperative detection, the hidden Markov model is used for describing the changing process of busy and idle states of authorization users in an authorization system, so the matrix of the hidden state transition probability in the hidden Markov model is expressed by the arrival rate and the service rate of the authorization users in the authorization system. Each of the cognitive users transmits detection results to a cognitive base station which will process the collected data via the Or-principle so as to get the detection results. At last, the Baum-Welsh algorithm is used for estimating the hidden Markov model and getting the hidden transition probability and confusion matrix, thereby estimating parameters of the arrival rate and the service rate in the authorization system. The authorization user parameter is applicable in cognitive radio systems.

Description

technical field [0001] The invention relates to the field of parameter estimation in a cognitive radio communication system, in particular to a method for estimating authorized user parameters based on a cooperative sensing method. Background technique [0002] In the cognitive radio communication system, authorized users have priority access to the authorized frequency band, and only when the authorized users are idle, cognitive users can access the idle channel for data transmission. Therefore, this communication mechanism requires the cognitive user to have the ability to perceive, that is, to perceive the state (idle or busy) of the authorized user. Cognitive user perception ability is mainly reflected by detection probability and false alarm probability. The higher the detection probability and the lower the false alarm probability, the stronger the perception ability of cognitive users. However, for the perception of a single cognitive user, the perception results ar...

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Application Information

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IPC IPC(8): H04W16/10H04W16/22H04W24/06
CPCH04W16/10H04W16/22H04W24/06
Inventor 马琳杨小龙谭学治何晨光
Owner HARBIN INST OF TECH
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