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Parameter estimation method based on energy perception for cognitive users to authorized users in cognitive radio communication systems

A technology for recognizing users and authorized users, applied in the field of authorized user parameter estimation, which can solve the problems of ineffectiveness and inability to obtain authorized user parameters.

Active Publication Date: 2017-03-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that in the cognitive radio communication system, cognitive users perform spectrum switching when authorized users appear, and the parameters of the authorized users cannot be obtained, and thus the benefits cannot be maximized, and a cognitive radio communication system is provided. Parameter Estimation Method Based on Energy Perception for Medium Cognitive User to Authorized User

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  • Parameter estimation method based on energy perception for cognitive users to authorized users in cognitive radio communication systems
  • Parameter estimation method based on energy perception for cognitive users to authorized users in cognitive radio communication systems
  • Parameter estimation method based on energy perception for cognitive users to authorized users in cognitive radio communication systems

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specific Embodiment approach 1

[0060] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, the method for estimating parameters based on energy perception from cognitive users to authorized users in the cognitive radio communication system described in this embodiment, which includes the following steps:

[0061] Step 1: The cognitive user uses the M / M / 1 / Z queuing model to model each authorized channel to obtain the authorized channel model, and obtains the state probability distribution of the authorized channel through calculation; Z is the authorized channel buffer capacity;

[0062] Step 2: use the hidden Markov model to describe the busy and idle state changes of the authorized channel, and obtain the hidden state transition probability matrix of the authorized channel;

[0063] Step 3: The cognitive user calculates the detection probability and false alarm probability through the energy perception method;

[0064] Step 4: Obtain the confusion m...

specific Embodiment approach 2

[0068] Embodiment 2: This embodiment further explains Embodiment 1. In step 1 of this embodiment, the cognitive user uses the M / M / 1 / Z queuing model to model each authorized channel, and obtains the authorized channel through calculation. The specific method of the state probability distribution of is:

[0069] The authorized channel model is based on FCFS rules; the authorized channel state ζ∈{0,1,2,...,Z} is set, when 0≤ζ≤Z-1, λ ζ Indicates the arrival rate of the authorized channel state from ζ to ζ+1; when 1≤ζ≤Z, μ ζ Represents the service rate of the authorized channel state from ζ to ζ-1; thus, the authorized channel state balance equation is obtained as:

[0070]

[0071] where P ζ (t) represents the probability that the authorized channel state is in the ζ state at time t;

[0072] According to the M / M / 1 / Z queuing model equivalent to the birth-death process of the finite state, and then according to the differential existence theorem of differential difference equ...

specific Embodiment approach 3

[0078] Specific implementation mode three: the following combination figure 1 and figure 2 Describe this embodiment, this embodiment will further explain the second embodiment, in the second step of this embodiment, the hidden Markov model is used to describe the busy and idle state changes of the authorized channel, and the hidden state transition probability matrix of the authorized channel is obtained The specific method is:

[0079] Hidden Markov model ψ=(A,B,π),

[0080] Among them, A is the hidden state transition probability matrix, B is the confusion matrix, and π is the initial state probability distribution of authorized users; the actual use of authorized users for authorized channels is regarded as a hidden state, and H 1 means busy, H 0 Indicates that it is idle; the detection result of the usage of the authorized channel by the cognitive user is regarded as an observable sequence, represented by D 1 Indicates that the detection result is busy, D 0 Indicates...

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Abstract

The invention relates to an energy perception based method for a cognitive user to estimate parameters of an authorized user in a cognitive radio communication system, belonging to the technical field of parameter estimation for authorized users. The invention aims at solving the problems that in the cognitive radio communication system, the cognitive user cannot obtain parameters of the authorized user during spectrum handover in appearance of the authorized user, and further cannot maximize the benefit. The method comprises that an authorized channel model is established, and the state probability distributions of authorized channels are obtained; busy and idle state changes of the authorized channels are described through a hidden Markov model (HMM), and a hidden state transfer probability matrix of the authorized channels is obtained; the detection probability and the false alarm probability are obtained via calculation in an energy perception method; a confusion matrix is further obtained; and finally the HMM is estimated in a Baum-Welsh algorithm to obtain the estimated value of the HMM. The method of the invention is used for estimating the parameters of the authorized users.

Description

technical field [0001] The invention relates to a parameter estimation method for a cognitive user to an authorized user based on energy perception in a cognitive radio communication system, and belongs to the technical field of parameter estimation for authorized users. Background technique [0002] In a cognitive radio communication system, cognitive users obtain licensed channel information through spectrum detection, so as to use licensed channels in an idle state. However, when authorized users appear, cognitive users need to exit the channel unconditionally, and channel switching, that is, spectrum switching, will occur at this time. Currently, in the field of cognitive radio research, spectrum switching is mainly divided into three methods: active spectrum switching, passive spectrum switching and hybrid spectrum switching. Regardless of the spectrum switching method, cognitive users need to know the parameters of authorized users, so as to formulate an optimal spect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/06H04W36/06
Inventor 马琳杨小龙谭学治何晨光迟永钢魏守明
Owner HARBIN INST OF TECH
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