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An Approximate Method for Solving the Length of Perception Slot in Cognitive Radio

A cognitive radio and time slot length technology, applied in the approximate field of solving the sensing time slot length, can solve problems such as slow solution speed and complex solution method of sensing time slot τ, achieving the effect of stable iteration times and reducing the amount of computation

Active Publication Date: 2017-11-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to solve the problem that the existing perceptual time slot τ solution method is complicated and the solution speed is slow

Method used

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  • An Approximate Method for Solving the Length of Perception Slot in Cognitive Radio
  • An Approximate Method for Solving the Length of Perception Slot in Cognitive Radio
  • An Approximate Method for Solving the Length of Perception Slot in Cognitive Radio

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Embodiment

[0025] 1. Raising the question

[0026] In cognitive radio spectrum sensing based on energy detection method, false alarm probability P f for:

[0027]

[0028] Where Q( ) is the Q function, Q -1 (·) is its inverse function, is the lower limit of spectrum sensing detection accuracy, f s is the sampling frequency, γ is the signal-to-noise ratio of authorized users, and τ is the perception time. The throughput rate of a single frame is:

[0029]

[0030] where C 0 The channel capacity of cognitive users when releasing spectrum for licensed users, H 0 Probability of stopping communication for an authorized user. The normalized throughput for a single frame is:

[0031]

[0032] The goal of the program is to quickly solve the optimal value τ after obtaining γ 0 , so that B(τ, γ) reaches the maximum. This is a nonlinear optimization problem, and conventional methods require multiple iterations with high complexity.

[0033] 2. Problem solving ideas

[0034] at...

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Abstract

The invention discloses an approximate method for solving the length of the sensing time slot in the cognitive radio, and the spectrum sensing of the cognitive radio network is usually arranged in the sensing time slot in the data frame, and the subsequent time slots are used to transmit data. It is a nonlinear optimization problem to set the length of the silent period in the frame, that is, the perception time slot, in order to achieve the maximum data throughput rate. Generally, the dichotomy method, golden section method or other numerical methods are used to solve it, and the amount of calculation required is very large. Large, not convenient for practical application. The invention proposes an approximation method with less complexity, which can significantly reduce the amount of computation.

Description

technical field [0001] The invention relates to the radio field, in particular to an approximate method for solving the perception time slot length in cognitive radio. Background technique [0002] The current spectrum resource allocation system authorizes and fixedly allocates spectrum resources to special users, resulting in a serious low utilization rate of spectrum resources. Cognitive radio enables unlicensed users (also known as cognitive users or secondary users) to find and dynamically access idle spectrum resources not used by licensed users without interfering with the work of licensed users (also called primary users), thereby significantly improving Spectrum utilization. [0003] Cognitive radios can use energy detection for spectrum sensing to determine access policies. A cognitive radio network (CRN, Cognitive Radio Network) uses a time slot τ at the beginning of a data frame for spectrum sensing, and uses the remaining time slots of the data frame for data t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/14H04W24/00
Inventor 宋铁成顾斌胡静孙大飞张雷吴名郭洁沈连丰
Owner SOUTHEAST UNIV