NDLI: A multiple trellis-coded hybrid-ARQ scheme for land mobile communication channels

Content Provider	IEEE Xplore Digital Library
Author	Eroz, M. Fuja, T.
Copyright Year	1995
Description	Author affiliation: Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA (Eroz, M.; Fuja, T.)
Abstract	A multiple trellis-coded scheme that adapts itself to varying channel conditions is proposed and simulated over a land mobile radio channel. The scheme can be classified as a type-II hybrid ARQ protocol that makes use of incremental redundancy. A multiple trellis code is one in which each trellis branch is associated with k/spl ges/2 transmitted baud. Simon and Divsalar (1988) have described a method for constructing multiple trellis codes suited for fading environments. Their design technique is used to create rate-compatible punctured trellis codes-analogous to the rate-compatible punctured convolutional codes of Hagenauer (1988)-that vary their redundancy in response to feedback from the demodulator to the transmitter. Specifically, we use a multiple trellis code of multiplicity k=3, designed for fading channels, as our "mother" code. Depending on the channel conditions, this code is punctured to get another code of multiplicity k=2 with a higher bandwidth efficiency. Both the mother and the punctured codes are shown to satisfy the design procedure of Simon et al. The proposed protocol does not require the transmitter to anticipate the channel quality before transmission. Moreover, the protocol requires only a low-rate feedback channel, with significant delay acceptable. The performance of the adaptive code is compared to a "static" code of the same bandwidth efficiency and complexity designed by Schlegel and Costello (1989). Simulations show that the adaptive code gives a coding gain of about 3 dB over the Schlegel-Costello code at a bit error probability of 10/sup -5/.
Starting Page	496
Ending Page	500
File Size	577741
Page Count	5
File Format	PDF
ISBN	0780324897
DOI	10.1109/MILCOM.1995.483516
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-05
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Convolutional codes Protocols Redundancy Fading Feedback Radio transmitters Bandwidth Adaptive coding Land mobile radio Automatic repeat request
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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