An EM Approach for Cooperative Spectrum Sensing in Multiantenna CR Networks

被引:32
作者
Assra, Ayman [1 ]
Yang, Jiaxin [2 ]
Champagne, Benoit [2 ]
机构
[1] TechTalent Consulting & TeamBldg Inc, Calabasass, CA 91302 USA
[2] McGill Univ, Dept Elect & Comp Engn, Montreal, PQ H3A 0E9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Channel state information; cognitive radio; expectation-maximization; joint detection and estimation; multi-antenna; spectrum sensing; COGNITIVE RADIO NETWORKS; CHANNEL-STATE INFORMATION; ROBUST; SYSTEMS; SIGNAL;
D O I
10.1109/TVT.2015.2408369
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, a cooperative wideband spectrum sensing scheme based on the expectation-maximization (EM) algorithm is proposed for the detection of a primary user (PU) system in multiantenna cognitive radio (CR) networks. Given noisy signal observations from N secondary users (SUs) over multiple subbands at a fusion center (FC), prior works on cooperative spectrum sensing often use the set of received subband energy as decision statistics over the sensing interval. However, to achieve satisfactory performance, knowledge of the channel state information (CSI) and the noise variances at all the SUs is required by these algorithms. To overcome this limitation, our proposed method, which is referred to as joint detection and estimation (JDE), adopts the EMalgorithm to jointly detect the PU signal and estimate the unknown channel frequency responses and noise variances over multiple subbands in an iterative manner. Various aspects of this proposed EM-JDE scheme are investigated, including a reliable initialization strategy to ensure convergence under practical conditions and a distributed implementation to reduce communication overhead. Under the assumption of perfect estimation for the channel frequency responses and noise variances, we further show that the proposed EM-JDE converges to the maximumlikelihood (ML) solution, which serves as an upper bound on its performance. Monte Carlo simulations over Rayleigh fading channels show that the proposed scheme significantly improves the performance of spectrum detection by exploiting the diversity of the spatially distributed SUs with multiple antennas.
引用
收藏
页码:1229 / 1243
页数:15
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