Joint Channel, Carrier Frequency Offset and I/Q Imbalance Estimation in Ambient Backscatter Communication Systems

被引：17

作者：

Abdallah, Saeed ^{[1
]}

Salameh, Ahmed, I ^{[1
]}

Saad, Mohamed ^{[2
]}

机构：

[1] Univ Sharjah, Dept Elect Engn, Sharjah, U Arab Emirates

[2] Univ Sharjah, Dept Comp Engn, Sharjah, U Arab Emirates

来源：

IEEE COMMUNICATIONS LETTERS | 2021年 / 25卷 / 07期

关键词：

Ambient backscatter communication systems; carrier frequency offset; channel estimation; expectation-maximization; I/Q imbalance; RELAY NETWORKS;

D O I：

10.1109/LCOMM.2021.3075493

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

Ambient backscatter communication systems (ABCSs) have been gaining popularity as a green alternative to conventional communication systems. To deploy such systems, it is important to acquire the channel state information (CSI) and to account for hardware imperfections such as carrier-frequency offsets (CFOs) and inphase/quadrature (I/Q) imbalance. In this work, we present two algorithms for the joint estimation of the channel, CFO and I/Q imbalance at the receivers of ABSCs. The first algorithm is the pilot-based maximum-likelihood estimator, while the second is a semi-blind estimator based on the expectation maximization (EM) framework. While both estimators converge to their respective Cramer-Rao bounds, the EM algorithm provides significantly higher estimation accuracy, leading to better bandwidth utilization.

引用

页码：2250 / 2254

页数：5

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