Modified absolute value cumulating spectrum sensing algorithm in cognitive radio

Zhiyong HE

doi:10.11959/j.issn.1000-0801.2017029

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Modified absolute value cumulating spectrum sensing algorithm in cognitive radio

Research and development | 更新时间：2024-06-05

- Modified absolute value cumulating spectrum sensing algorithm in cognitive radio
- Telecommunications Science Vol. 33, Issue 2, Pages: 98-103(2017)
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- DOI：10.11959/j.issn.1000-0801.2017029
  CLC： TN92
- Published Online：2017-02，
  
  Published：20 February 2017
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Zhiyong HE. Modified absolute value cumulating spectrum sensing algorithm in cognitive radio[J]. Telecommunications science, 2017, 33(2): 98-103.
DOI：

Zhiyong HE. Modified absolute value cumulating spectrum sensing algorithm in cognitive radio[J]. Telecommunications science, 2017, 33(2): 98-103. DOI： 10.11959/j.issn.1000-0801.2017029.

摘要

AVC算法是一种适用于拉普拉斯噪声环境的常用频谱感知算法，但该算法并未充分平滑拉普拉斯噪声中的“尖峰”，导致算法的检测性能不佳。针对此，提出一种改进的AVC频谱感知算法，其原理是对接收信号绝对值做开根号处理，并累加处理结果，作为检验统计量，进而判决是否存在主用户，实现频谱感知。此外，利用中心极限定理推导了所提算法检验统计量在主用户不存在时的概率密度曲线，从而给出理论判决门限。仿真表明，所提算法的检测性能分别优于AVC感知算法和拉普拉斯噪声下的能量检测算法大约1 dB和4 dB。

Abstract

Absolute value cumulating (AVC) algorithm is a common spectrum sensing method in Laplacian noise (LED) surroundings

however

the ‘spikes or outliers' in Laplacian noise can't be fully smoothed

which results in bad detection performance.Aiming at this problem

an modified AVC spectrum sensing algorithm was proposed.The principle was to do the processing of the absolute value of the received signal and the processing result was accumulated as the test statistic to determine whether there was the main user and realize the spectrum sensing.In addition

the central limit theorem was used to deduce the probability density curve of the proposed test statistic in the absence of the primary user

and the theoretical decision threshold was given.Numerical results show that the proposed algorithm outperforms the AVC sensing algorithm and energy detection algorithm with Laplacian noise about 1 dB and 4 dB respectively.

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references

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