Authorized User Parameter Estimation Method Based on Cooperative Sensing in Cognitive Radio System

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 present invention relates to the field of parameter estimation in a cognitive radio communication system, in particular to an authorized user parameter estimation method based on a cooperative sensing method. Background technique

[0002] In a cognitive radio communication system, authorized users have priority access to authorized frequency bands. Only when authorized users are in an idle state, cognitive users can access idle channels for data transmission. Therefore, this communication mechanism requires cognitive users to have the ability to perceive, that is, to perceive the status of authorized users (idle or busy). 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 cognitive user perception ability. However, for a single cognitive user's perception, the perception result is not ideal due to fa...

Examples

Embodiment Construction

[0027] Combine figure 1 The specific implementation of the present invention, the method for estimating the parameters of authorized users based on cooperative perception in the cognitive radio system, is implemented by the following steps:

[0028] Step 1. Use the queuing model to model and analyze each authorized channel. Assuming that the authorized user arrival rate obeys the Poisson distribution, the window service rate meets the exponential distribution, each channel has only one window for service at the same time, and the channel buffer capacity is Authorized users follow the "first come, first served" principle. Assume Indicates the state of the authorized channel, that is, the number of authorized users in the authorized system. when When, λ c Represents the arrival rate of the authorized channel state from c to c+1; when 时,μ c Represents the service rate of authorized channel status from c to c-1. At this time, let The stable channel state probability distributio...

Technical field

[0001] The present invention relates to the field of parameter estimation in a cognitive radio communication system, in particular to an authorized user parameter estimation method based on a cooperative sensing method. Background technique

[0002] In a cognitive radio communication system, authorized users have priority access to authorized frequency bands. Only when authorized users are in an idle state, cognitive users can access idle channels for data transmission. Therefore, this communication mechanism requires cognitive users to have the ability to perceive, that is, to perceive the status of authorized users (idle or busy). 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 cognitive user perception ability. However, for a single cognitive user's perception, the perception result is not ideal due to fa...

Examples

Embodiment Construction

[0027] Combine figure 1 The specific implementation of the present invention, the method for estimating the parameters of authorized users based on cooperative perception in the cognitive radio system, is implemented by the following steps:

[0028] Step 1. Use the queuing model to model and analyze each authorized channel. Assuming that the authorized user arrival rate obeys the Poisson distribution, the window service rate meets the exponential distribution, each channel has only one window for service at the same time, and the channel buffer capacity is Authorized users follow the "first come, first served" principle. Assume Indicates the state of the authorized channel, that is, the number of authorized users in the authorized system. when When, λ c Represents the arrival rate of the authorized channel state from c to c+1; when 时,μ c Represents the service rate of authorized channel status from c to c-1. At this time, let The stable channel state probability distributio...

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