NDLI: Error-control options for parallel-tone HF modems

Content Provider	IEEE Xplore Digital Library
Author	Cook, S.C. Giles, T.C. Vyden, B. Gill, M.C.
Copyright Year	1993
Description	Author affiliation: Defense Sci. & Technol. Organization, Salisbury, SA, Australia (Cook, S.C.; Giles, T.C.; Vyden, B.; Gill, M.C.)
Abstract	DSTO is pursuing a program to adapt the configuration and operational parameters of military radio systems to optimize channel utility. This led the authors to compare the relative performance of 2400 bps MIL-STD-188-110A HF modems in a variety of channel environments. They show that the performance differences between the three waveforms are primarily a function of the error-control coding employed which in turn prompted them to investigate options to improve the error control on the earlier parallel-tone modems. This paper concentrates on the provision of digital voice transmission over systems employing a 16-tone modem structure where feedback adaptation is not available. This mandated a processing delay of no more than a few tenths of a second and a minimum throughput of 2400 bps. The approach adopted was to extend the signalling constellation of each of the tones from QPSK to 8 PSK and to apply rate 2/3 error-correcting codes to the bit stream before transmission. Results are given for two BCH codes, two Reed-Solomon codes, a convolutional code and a TCM scheme for both simulated and real HF channels. The results presented indicate that the parallel-tone format coupled to a TCM scheme showed clear superiority to the single-tone modem. The paper concludes with a discussion of the issues to be addressed in the design of an optimal parallel-tone error-control strategy.
Starting Page	933
Ending Page	938
File Size	576708
Page Count	6
File Format	PDF
ISBN	0780309537
DOI	10.1109/MILCOM.1993.408684
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-11
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hafnium Modems Error correction Feedback Delay Throughput Constellation diagram Quadrature phase shift keying Phase shift keying Error correction codes
Content Type	Text
Resource Type	Article

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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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