Performance of coded time-diversity free-space optical links

Depending on the tolerable delay latency, we can benefit from some degree of time diversity in free-space optical links, by employing channel coding and interleaving. We present a comparative study of the performance of different channel coding techniques at the presence of time diversity. We show t...

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Bibliographic Details
Main Authors: Fang Xu, Khalighi, M.-A., Causse, P., Bourennane, S.
Format: Conference Proceeding
Language:English
Subjects:
Atmospheric modeling
Channel coding
Convolutional codes
Decoding
Delay
Intensity modulation
Optical fiber communication
Optical receivers
Optical refraction
Optical transmitters
Online Access:Request full text
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Summary:Depending on the tolerable delay latency, we can benefit from some degree of time diversity in free-space optical links, by employing channel coding and interleaving. We present a comparative study of the performance of different channel coding techniques at the presence of time diversity. We show that turbo-codes are particularly efficient under strong turbulence conditions. For relatively weak turbulence, however, a simple convolutional code makes a good compromise between decoding complexity and performance. We also address the problem of channel estimation at the receiver, and show that only few pilot symbols are sufficient to provide a performance close to the case of perfect channel knowledge.
DOI:10.1109/BSC.2008.4563225