Efficient multi user CFO estimation and correction techniques in uplink OFDMA systems

2014 ◽  
Author(s):  
Neetha I. Eappen ◽  
J. Arun Prakash ◽  
G. Ramachandra Reddy
Keyword(s):  
Estimation And Correction

Algorithm of Estimation and Correction of Wireless Telecommunications Quality

2018 ◽  
Author(s):  
Aleksander V. Kopyltsov ◽  
Alla G. Kravets ◽  
Gennady V. Abrahamyan ◽  
Galiya R. Katasonova ◽  
Aleksander D. Sotnikov ◽  
...  
Keyword(s):  
Wireless Telecommunications ◽  
Estimation And Correction

scholarly journals Determination and correction of aberrations in full field OCT using phase gradient autofocus by maximizing the likelihood function

2020 ◽  
Author(s):  
Vasily Matkivsky ◽  
Alexander Moiseev ◽  
Pavel Shilyagin ◽  
Alexander Rodionov ◽  
Hendrik Spahr ◽  
...  
Keyword(s):  
High Frequency ◽  
Likelihood Function ◽  
Synthetic Aperture ◽  
Numerical Estimation ◽  
Optical Aberrations ◽  
Phase Gradient ◽  
Full Field ◽  
Fundus Imaging ◽  
Spatial Frequencies ◽  
Estimation And Correction

A method for numerical estimation and correction of aberrations of the eye in fundus imaging with optical coherence tomography (OCT) is presented. Aberrations are determined statistically by using the estimate based on likelihood function maximization. The method can be considered as an extension of the phase gradient autofocusing algorithm in synthetic aperture radar imaging to 2D optical aberrations correction. The efficiency of the proposed method has been demonstrated in OCT fundus imaging with 6λ aberrations. After correction, single photoreceptors were resolved. It is also shown that wavefront distortions with high spatial frequencies can be determined and corrected.Graphical Abstract for Table of Contents[Text. This work is dedicated to development a method for numerical estimation and correction of aberrations of the eye in fundus imaging with OCT. Aberration evaluation is performed statistically by using estimate based on likelihood function maximization. The efficiency of the proposed method has been demonstrated in OCT fundus imaging with 6λ aberrations. It has been shown that spatial high-frequency wavefront distortions can be determined]

Joint Channel and Carrier Frequency Offset Estimation and Correction for Coherent Optical FBMC/OQAM System

2018 ◽  
Vol 38 (2) ◽  
pp. 0206003 ◽  
Author(s):  
赵奇飞 Zhao Qifei ◽  
王首鹏 Wang Shoupeng ◽  
徐雨萌 Xu Yumeng ◽  
孔鸿鹏 Kong Hongpeng ◽  
任栋 Ren Dong ◽  
...  
Keyword(s):  
Carrier Frequency ◽  
Carrier Frequency Offset ◽  
Frequency Offset ◽  
Frequency Offset Estimation ◽  
Carrier Frequency Offset Estimation ◽  
Joint Channel ◽  
Estimation And Correction
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