NDLI: Pilot assisted SOVA decoding for turbo codes

Content Provider	IEEE Xplore Digital Library
Author	Yi Zheng Vaisey, J.
Copyright Year	2004
Description	Author affiliation: Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada (Yi Zheng; Vaisey, J.)
Abstract	A pilot-assisted turbo coding system is proposed in which pilot bits are periodically inserted into the bit stream to be encoded by turbo encoder. In our rate 1/2 example, both the systematic bit for the pilot and a corresponding parity are punctured to keep the code rate unchanged On the decoding side, two schemes are proposed to improve the performance; the first uses the pilots to detect possible errors and scales the extrinsic information accordingly, while the second modifies the path metric. These two ideas can be combined to further improve the performance. The application of this scheme to soft output Viterbi algorithm (SOVA) is studied. In comparison with the standard SOVA decoder, our simulation results show that the use of pilot symbols to detect errors and scale the extrinsic information can result in a coding gain of 0.38 dB at an SNR of 2.5 dB. By itself, the modified metric contributes to an improvement of 0.12 dB at this same SNR, while a combination of the above two schemes achieves a 0.45 dB improvement.
Starting Page	2285
Ending Page	2289
File Size	333562
Page Count	5
File Format	PDF
ISBN	0780383443
ISSN	15253511
DOI	10.1109/WCNC.2004.1311444
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Turbo codes Maximum likelihood decoding Iterative decoding Viterbi algorithm Concatenated codes Convolutional codes Iterative algorithms AWGN Bidirectional control Computational complexity
Content Type	Text
Resource Type	Article

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