NDLI: Unequal protection with turbo decoding for high-order modulated signaling

Content Provider	IEEE Xplore Digital Library
Author	Wang, C.C. Quang Vo
Copyright Year	2005
Description	Author affiliation: Aerosp. Corp., El Segundo, CA, USA (Wang, C.C.)
Abstract	Although binary turbo codes can achieve a significant amount of coding gain, they generally do not have good bandwidth efficiency unless they are heavily punctured. The simplest way to attain both power and bandwidth efficiency is to adopt nonbinary modulation schemes, such as 8PSK and 16QAM, in conjunction with a turbo code. This approach requires bit logarithmic likelihood ratios (LLRs) from the nonbinary demodulator for binary turbo decoding. When these bit LLRs are formed, different bits are unequally protected against channel corruption. Because the systematic and parity-check bits of a turbo codeword play different roles in the process of decoding, mapping them with different levels of protection to signal constellation results in different bit-error rate (BER) performances. In this paper, it is shown that the threshold BER can be improved when systematic bits are more protected while the decoding error floor can be lowered when parity-check bits are more protected. This provides an additional dimension of waveform design by mapping systematic or parity-check bits to different bit positions in the non-binary signal constellation.
Starting Page	1041
Ending Page	1045
File Size	2010542
Page Count	5
File Format	PDF
ISBN	0780389662
ISSN	15253511
DOI	10.1109/WCNC.2005.1424652
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-03-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protection Decoding Turbo codes Parity check codes Bit error rate Bandwidth Signal mapping Constellation diagram Modulation coding Demodulation
Content Type	Text
Resource Type	Article

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