第 41 卷第5 期 电子科技大学学报 Vo l .4 1 N o . 5
2012年9月 Journal of University of Electronic Science and Technology of China Sep. 2012
基于线性加权数据融合的协作频谱感知优化
刘全
1,2
,高 俊
2
,郭云玮
2
,刘思洋
2
(1. 中国电子系统设备工程公司研究所 北京 丰台区 100141; 2. 海军工程大学通信工程系 武汉 430033)
【摘要】在认知无线电网络中,协作频谱感知技术可有效地缓解本地感知场景中存在的隐藏终端等问题。为了获得更大
的协作增益,该文采用基于数据融合的协作频谱感知策略,融合中心依次收集各次用户上报的本地能量检测数据,然后进行
线性加权融合,并做出最终判决。重点研究了线性加权融合方案的优化,推导了各次用户分别在Neyman-Pearson (N-P)和
Bayesian两种不同准则下的最优融合权重,并在Suzuki感知信道下进行了蒙特卡洛仿真和数值验证。结果表明,N-P准则下给
出的两种优化加权融合方案MDC和NDC性能相近,且均比EGC、SC、MRC等常用的融合方案具有更高的协作检测概率;而
Bayesian准则下推导的优化加权融合方案BAY在检测可靠性方面明显优于其他方案。
关键词
Bayesian
准则
;
认知无线电
;
数据融合
;
能量检测
; Neyman-Pearson
准则
;
频谱感知
中图分类号
TN92
文献标识码
A doi:10.3969/j.issn.1001-0548.2012.05.011
O
timal Coo
erative S
ectrum Sensin
BasedonLinearDataFusion
LIU Quan
1,2
, GAO Jun
2
, GUO Yun-wei
2
, and LIU Si-yang
2
(1. Institute of China Electronic Systen Engineering Company Fengtai Beijing 100141;
2. Department of Communication Engineering, Naval University of Engineering Wuhan 430033)
Abstract Cooperative spectrum sensing is regarded as a key technology to tackle the challenges such as
hidden terminal problem in local spectrum sensing of cognitive radio networks. In this paper, the cooperation
strategy based on data fusion is chosen for better collective sensing performance, in which all cooperative users
send their own local results of energy detection to the fusion centre for linear data combination and final decision.
As the main focus of this work, the optimization of linear data fusion is investigated. Specifically, the optimal
weight vectors for all users are derived under Neyman-Pearson (N-P) and Bayesian criteria, respectively. Monte
Carlo simulations and numerical results are given under the assumption that the sensing channels follow Suzuki
distribution. Obtained results demonstrate that the two optimal fusion schemes under N-P criterion, MDC and NDC
have the similar detection performance, and they both outperform three other generally used schemes, including
EGC, SC and MRC. Further, the optimal fusion scheme BAY, which is derived under Bayesian criterion, is verified
to be more reliable than other schemes.
Key words Bayesian criterion; cognitive radio; data fusion; energy detection; Neyman-Pearson
criterion; spectrum sensing
收稿日期:2010 05 24; 修回日期:2010 09 27
基金项目:国家863项目(2009AAJ208, 2009AAJ116)
作者简介:刘全(1985 ),男,博士生,主要从事认知无线电网络链路层关键技术方面的研究.