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Approximation method used for solving length of perception time slot in cognitive radio

A technology of cognitive radio and time slot length, which is applied in the approximate field of solving the length of perception time slot, and can solve the problems of slow solution speed and complex solution method of perception time slot τ.

Active Publication Date: 2014-11-19
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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  • Approximation method used for solving length of perception time slot in cognitive radio
  • Approximation method used for solving length of perception time slot in cognitive radio
  • Approximation method used for solving length of perception time slot in cognitive radio

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Embodiment

[0023] 1. Raising the question

[0024] In cognitive radio spectrum sensing based on energy detection method, false alarm probability P f for:

[0025] P f = Q [ 2 γ + 1 Q - 1 ( P ‾ d ) + γ f s τ ] - - - ( 1 )

[0026] 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:

[0027] ...

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Abstract

The invention discloses an approximation method used for solving the length of a perception time slot in cognitive radio. In the prior art, the spectrum perception of a cognitive radio network is usually carried out in the perception time slot in a data frame, and a subsequent time slot is used for data transmission. The problem of setting the length of an intra-frame silent period, that is the perception time slot, so as to reach the maximum data throughput rate, is a nonlinear optimization problem, and is usually solved through the dichotomy, the golden section method or other numerical value methods which require extremely large calculation quantity and are inconvenient for practical application. The approximation method provided by the invention is smaller in complexity and can reduce the calculation amount prominently.

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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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