A Spectrum Sensing Scheme with Weighted Collaboration of Dynamical Clustering Using Space-Time Block Code

doi:10.7652/xjtuxb201408005

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A Spectrum Sensing Scheme with Weighted Collaboration of Dynamical Clustering Using Space-Time Block Code

更新时间：2025-07-09

- A Spectrum Sensing Scheme with Weighted Collaboration of Dynamical Clustering Using Space-Time Block Code
- Vol. 48, Issue 8, Pages: 23-28+66(2014)
- 作者机构：
  
  1. 山东大学信息科学与工程学院,济南,250100
  2. 四川理工学院企业信息化与物联网测控技术四川省高校重点实验室,四川,自贡,643000
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201408005
  CLC： TN92
- Online First：10 August 2014，
  
  Published：2014
- 稿件说明：
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A Spectrum Sensing Scheme with Weighted Collaboration of Dynamical Clustering Using Space-Time Block Code[J]. 2014, 48(8): 23-28+66.
DOI：

A Spectrum Sensing Scheme with Weighted Collaboration of Dynamical Clustering Using Space-Time Block Code[J]. 2014, 48(8): 23-28+66. DOI： 10.7652/xjtuxb201408005.

摘要

针对认知无线电网络中存在的非理想反馈信道与用户间信道使合作频谱感知算法难以有效提高频谱检测性能的问题

提出了一种基于空时分组编码的动态分组加权合作频谱感知(DC-WCSS)方案。首先将所有未分组认知用户中具有最高用户间信道平均信噪比的两个用户分为一组

并依此将剩余用户进行两两分组

然后根据各认知用户检测结果对系统检测性能的贡献对认知用户进行加权

赋予不同权重

最后采用空时分组编码(STBC)方案将用户检测结果传输给基站进行判决。DC-WCSS方案可依据用户间信道平均信噪比进行动态分组

并根据认知用户检测结果的可靠性设置用户权重

能有效降低反馈阶段的误码率

从而提高系统检测性能。仿真结果表明

与基于传输分集的合作频谱感知方案相比

在虚警概率为0.3时

DC-WCSS方案的一次加权和二次加权后的系统检测概率可分别提升至少20%和30%。

Abstract

A dynamical clustering based weighted collaborative spectrum sensing(DC-WCSS)scheme with space-time block code is proposed to solve the problem that the traditional collaborative spectrum sensing cannot improve the detection performance of the spectrum sensing efficiently caused by the non-ideal reporting channel and inter-user channel in cognitive radio networks. At first

the proposed scheme groups the two secondary users with the highest average signal-to-noise ratio(SNR)of the inter-user channel into a cluster and the remaining users are grouped into clusters in the same way. Then

the weighted factors are assigned to the secondary users according to the contributions of their detection results to the system detection performance. Finally

the space-time block code is adopted in each cluster to enhance the resulting transmission. Since the design of the dynamical clusters based on average SNRs of the inter-user channels and the allocation of the weighted factors to the secondary users take the reliability of the users' detection results into account

the DC-WCSS scheme can decrease the bit error rate of the reporting channels and improve the system detection performance. Simulation results show that the DC-WCSS outperforms the transmit diversity based on collaborative spectrum sensing scheme and its first-weighted scheme and second-weighted scheme can get at least 20% and 30% increase in the system sensing performance

respectively

when the false alarm probability is 0.3.

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Keywords

references

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