Impact of channel estimation error on decentralized detection in bandwidth constrained wireless sensor networks
Impact of channel estimation error on decentralized detection in bandwidth constrained wireless sensor networks
复制标题
带宽受限无线传感器网络中信道估计误差对分散检测的影响
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
A. Vosoughi
中科院分区：
文献类型：
--
作者：
Hamid R. Ahmadi;A. Vosoughi
在本文中，我们考虑在分布式检测系统中的融合决策的问题时，在传感器的本地二进制决策是通过无线链路传输的衰落和噪声。我们考虑一个基于训练的信道估计器，融合中心（FC）估计传感器和FC之间的复杂信道。我们推导出似然比测试（LRT）融合规则，将复杂的信道估计的情况下，传感器采用BPSK，OOK，二进制FSK，和二进制PPM信号调制他们的二进制本地决策。研究了信道估计误差对系统性能的影响。作为一个基准，我们比较它与融合规则，假设完美的信道状态信息（CSI）。性能评估表明，随着信噪比的增加，信道估计误差减小，系统性能接近千里眼的情况下，理想的CSI假设在FC。
In this paper we consider the problem of fusing decisions in a distributed detection system when the local binary decisions made at the sensors are transmitted over wireless links subject to fading and noise. We consider a training based channel estimator with which the fusion center (FC) estimates the complex channels between the sensors and the FC. We derive the likelihood-ratio-test (LRT) fusion rules that incorporate the complex channel estimates for the cases where the sensors employ BPSK, OOK, binary FSK, and binary PPM signaling to modulate their binary local decisions. We study the effect of channel estimation error on the system performance. As a benchmark we compare it with a fusion rule that assumes perfect channel state information (CSI). Performance evaluation shows that as SNR increases the channel estimation error decreases and the system performance approaches to the clairvoyant scenario where perfect CSI is assumed at the FC.