NDLI: Optimal Hybrid RF-Wireless Optical Communication for Maximum Efficiency and Reliability

Content Provider	IEEE Xplore Digital Library
Author	Vangala, S. Pishro-Nik, H.
Copyright Year	2007
Description	Author affiliation: Massachusetts Univ., Amherst (Vangala, S.; Pishro-Nik, H.)
Abstract	Free space optical (FSO) communication systems provide tremendous potential for low-cost time-constrained high-bandwidth connectivity in a variety of network scenarios. However, these communication systems are highly unreliable due to the variations in the atmospheric channel thus making carrier grade reliabilities very difficult. Previous solutions suggest the use of a backup RF channel in conjunction with the FSO channel. The transmitted message is also duplicated on the RF channel allowing data recovery during the failure of the optical wireless channel. However, this leads to a wastage of the bandwidth of the RF channel and may sometimes also lead to channel "flapping". In this paper, we propose a novel coding mechanism that optimally achieves the capacity of the combined FSO and RF channels and still provides carrier grade (99.999%) reliabilities in the FSO link. The proposed mechanism uses nonuniform and rate-compatible LDPC codes to achieve the desired reliability and capacity limits. By avoiding data duplication, we preserve to a great extent the crucial security benefit of the FSO communication. Using simulations, we provide initial results on the performance of these codes to support our claims. In particular, we show that, more than two orders of magnitude improvements in the bit error rates and many-fold decrease in the outage probabilities are possible when using hybrid channel codes.
Starting Page	684
Ending Page	689
File Size	1615893
Page Count	6
File Format	PDF
ISBN	1424410633
DOI	10.1109/CISS.2007.4298393
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-03-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Availability Wireless communication Data security Redundancy Bandwidth Optical fiber communication Data communication Communication system security Atmospheric waves
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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