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兰州理工大学 [2]
长春光学精密机械与物... [1]
华南理工大学 [1]
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会议论文 [4]
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2015 [2]
2010 [1]
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A novel concatenated coding scheme combined LDPC and VBLAST for FSO links
会议论文
Chengdu, China, June 6, 2015 - June 7, 2015
作者:
Wang, Huiqin
;
Wang, Fen
;
Cao, Minghua
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浏览/下载:13/0
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提交时间:2020/11/15
Bells
Bit error rate
Concatenated codes
Data communication equipment
Fading channels
Forward error correction
Iterative decoding
Mean square error
Monte Carlo methods
Optical communication
Turbo codes
Belief propagation decoding algorithms
Concatenated coding
Free Space Optical communication
Free-space optical
Low density parity check
Low-density parity-check (LDPC) codes
Minimum mean square errors (MMSE)
Vertical Bell Labs layered space time
A Novel Concatenated Coding Scheme Combined LDPC and VBLAST for FSO Links
会议论文
作者:
Wang, Huiqin
;
Wang, Fen
;
Cao, Minghua
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浏览/下载:4/0
  |  
提交时间:2019/11/15
Free-space Optical
concatenated coding scheme
Low Density Parity Check
vertical Bell Labs layered space-time
Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE)
会议论文
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
Zhang X.
;
Zhang X.
;
Shi G.
;
Zhang J.
;
He F.
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提交时间:2013/03/25
Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus
which means the system MTF is quite insensitive to defocus
and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However
it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration
especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification
a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm
effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed
in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried
and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.
Modified APP-Based Decoding Algorithm for Low-Density Parity Check Codes (CPCI-S收录)
会议论文
2011 7TH INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS, NETWORKING AND MOBILE COMPUTING (WICOM)
作者:
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提交时间:2019/04/15
Low-density parity-check (LDPC) codes
APP-based decoding
iterative decoding algorithm
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