NDLI: The effects of channel characteristics on turbo code performance

Content Provider	IEEE Xplore Digital Library
Author	Jordan, M.A. Nichols, R.A.
Copyright Year	1996
Description	Author affiliation: Appl. Phys. Lab., Johns Hopkins Univ., Laurel, MD, USA (Jordan, M.A.)
Abstract	Turbo codes provide greater coding gain than commonly used convolutional codes. The maximum a-posteriori turbo decoder, unlike the Viterbi decoder often used for convolutional codes, explicitly uses E/sub b//N/sub 0/ as a parameter in the decoding process. We have investigated the effects of errors in estimating the E/sub b//N/sub 0/ on turbo code bit error rate (BER) performance in additive white Gaussian noise (AWGN) channels and binary symmetric channels (BSCs). Both small (220 bit) and large (65535 bit) buffers have been tested. For a BSC without any E/sub b//N/sub 0/ estimation error, the small buffer turbo code yields a BER of 10/sup -3/ at an E/sub b//N/sub 0/ of 3.9 dB and the large buffer turbo code yields a BER of 10/sup -5/ at an E/sub b//N/sub 0/ of 3 dB. The small interleaver turbo code operating over a two link satellite demod/remod channel produces a net BER of 10/sup -3/ with an uplink E/sub b//N/sub 0/ of 5 dB and a downlink E/sub b//N/sub 0/ of 6.6 dB. When E/sub b//N/sub 0/ estimation errors are included in the AWGN or BSCs, the results indicate that errors of up to several dB can be tolerated before the onset of significant degradation in turbo code performance.
Starting Page	17
Ending Page	21
File Size	451310
Page Count	5
File Format	PDF
ISBN	0780336828
DOI	10.1109/MILCOM.1996.568576
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Turbo codes Bit error rate Decoding AWGN Convolutional codes Estimation error Maximum a posteriori estimation Viterbi algorithm Additive white noise Testing
Content Type	Text
Resource Type	Article

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