Combined authorized user perception and link state estimation method and device

A joint estimation and authorized user technology, applied in the field of depth perception, can solve problems such as increasing detection difficulty, increasing received signal uncertainty, and affecting spectrum sensing performance, so as to improve spectrum sensing performance, optimize cognitive resource allocation and scheduling, Effect of Improving Spectrum Sensing Performance

Active Publication Date: 2014-07-09
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in practice, the unknown PS-LSI will increase the received signal uncertainty, which in turn will negatively affect the spectrum sensing performance
Especially considering the actual time-varying fading channel, the dynamic channel gain that changes with time will greatly increase the difficulty of detection, resulting in poor spectrum sensing performance
Although the existing literature considers the statistical probability distribution function (Probabilit

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  • Combined authorized user perception and link state estimation method and device
  • Combined authorized user perception and link state estimation method and device
  • Combined authorized user perception and link state estimation method and device

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Embodiment Construction

[0022] The present invention establishes a dynamic state space model for joint spectrum sensing and related link state information estimation, adopts Bernoulli stochastic finite set theory, designs a two-stage Bernoulli filter algorithm, and adopts particle filter technology to realize the working state and correlation of unknown authorized users. Joint estimation of link state information. The relevant methods and theories are described below.

[0023] 1. Dynamic Space State Model (DSM)

[0024] The DSM model that the present invention proposes is as follows:

[0025] the s n =F(s n-1 ) (1)

[0026] alpha n =H(α n-1 ) (2)

[0027] the y n =G(α n ,s n,m ,w n,m ) (3)

[0028] Among them, equations (1) and (2) are dynamic equations, s n Indicates the status of the authorized user at the nth moment, α n Represents the unknown PS-LSI at time n; Equation (3) is called the observation equation, where y n Indicates the observation amount of cog...

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Abstract

The invention provides a combined authorized user perception and link state estimation method and device in order to resolve the problem of spectrum sensing in the cognitive radio technology. The method takes link state information between a main user and a secondary user into account, and takes the link state information as another hidden state in spectrum sensing, and then a universal dynamic state space model is built. A Bernoulli smoothing mechanism is designed based on the Bayesian sequential estimation framework and the Bernoulli random finite set theory, and combined blind estimation of the state information of a main link and a secondary link can be obtained while the work state of an authorized frequency band is perceived and detected (the algorithm process is shown in the picture). The combined authorized user perception and link state estimation method makes full use of the state information of the main link and the secondary link, thereby obviously improving the performance of spectrum sensing. Meanwhile, the obtained state information of the main link and the secondary link can be used for subsequent resource optimization. In addition, the combined authorized user perception and link state estimation method and device have universality and can be expanded to other state information of the main link and the secondary link.

Description

technical field [0001] Aiming at the problem of licensed spectrum sensing in cognitive radios (Cognitive Radios, CRs), the present invention designs and proposes a new joint licensed spectrum sensing and link state estimation method, so it can be called deep sensing (Deep sensing). While detecting authorized users, it also takes into account the link status information between unknown authorized users and secondary users, and establishes a dynamic state-space model (Dynamic State-space Model, DSM); the above-mentioned authorized user perception and joint The link state estimation problem is modeled as a Bernoulli Random Finite State (BRFS), and a Bernoulli filtering mechanism is designed to realize the PS-LSI The joint blind estimate of . The method and device have sufficient scalability and can handle any PS-LSI (such as time-varying channel gain). belongs to the field of communication. Background technique [0002] Cognitive radio technology dynamically accesses the all...

Claims

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Application Information

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IPC IPC(8): H04W72/08H04W72/14
Inventor 李斌南一江赵成林许方敏
Owner BEIJING UNIV OF POSTS & TELECOMM
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