NDLI: Anti-jam Communications Using Frequency-Hopped OFDM and LDPC with Erasure Decoding ("Minotaur")

Content Provider	IEEE Xplore Digital Library
Author	Mailaender, L.
Copyright Year	2013
Description	Author affiliation: LGS Innovations LLC, Florham Park, NJ, USA (Mailaender, L.)
Abstract	We consider frequency-hopped OFDM (FH-OFDM) as the basis for anti-jam communications achieving very high processing gain. A conventional OFDM signal is hopped across a number of frequency sub-bands. Our design hops a 1 MHz bandwidth OFDM waveform to one of 400 frequencies (26 dB processing gain), occupying a large total bandwidth of 400 MHz. On each hop we assume an independent channel realization and jammer state. Employing 16-QAM and rate-1/2 coding, we achieve a data rate of 1.22 Mbps after accounting for all overheads, such as cyclic prefix, pilots, and peak-to-average control. We examine the impact of coding across hops in fading channels to achieve frequency diversity, and design custom LDPC codes for the resulting short block length (1248 information bits). We find that under jammed conditions erasure decoding improves BER by an order of magnitude, and develop a simple yet effective "in-band" approach to jammer state estimation. A non-real-time prototype was tested in the lab, sending the 400 MHz signal over a wired channel. Jamming levels high enough to completely preclude non-hopped communication degrade our system by only 2-5 dB, depending on channel conditions.
Sponsorship	IEEE Commun. Soc.
Starting Page	84
Ending Page	88
File Size	1035650
Page Count	5
File Format	PDF
ISBN	9780769551241
DOI	10.1109/MILCOM.2013.24
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Jamming OFDM Parity check codes Bit error rate Noise Encoding Receivers jammer state estimation FH-OFDM erasure decoding
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
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