Blind Signal Detection Under Synchronization Errors for FSO Links With High Mobility

We consider the use of free-space optical communication for fast moving platforms such as high-speed trains, where the sampling clock offset is randomly changing, in addition, the receiver does not have any information on the instantaneous channel fading coefficient. By employing multiple samplers a...

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Bibliographic Details
Published in:IEEE transactions on communications 2019-10, Vol.67 (10), p.7006-7015
Main Authors: Dabiri, Mohammad Taghi, Sadough, Seyed Mohammad Sajad, Khalighi, Mohammad Ali
Format: Article
Language:English
Subjects:
Adaptive optics
atmospheric turbulence
blind data detection
Clocks
Complexity
Complexity theory
differential signaling
Engineering Sciences
Free-space optical communication
Free-space optics
High speed rail
Likelihood ratio
Numerical methods
On-Off Keying
Optical transmitters
Optics
Photonic
Receivers
Samplers
Signal and Image processing
Signal detection
Synchronism
Synchronization
Transmitters
Wavelengths
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Summary:We consider the use of free-space optical communication for fast moving platforms such as high-speed trains, where the sampling clock offset is randomly changing, in addition, the receiver does not have any information on the instantaneous channel fading coefficient. By employing multiple samplers at the receiver, we propose a class of sequence detection methods for the case of On-Off keying (OOK) signaling without using any training sequence. First, we study maximum likelihood-based detection, which has a relatively high-computational complexity. Second, by employing generalized likelihood ratio test, we propose a more practical blind sequence detection method of reduced complexity. To further reduce the computational complexity, third, we propose a novel scheme that uses two wavelengths at the transmitter and differential blind detection at the receiver. Fourth, to benefit from diversity gain with this differential scheme, we consider the use of sufficiently different wavelengths along with sufficient spatial separation between the transmitters and/or the receivers, where we propose an efficient blind detection method. The pros and cons of the proposed detection methods are contrasted through numerical results and their processing loads are compared.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2019.2930254