DocumentCode :
1616744
Title :
Nonlinear Turbo Codes for Higher-Order Modulations
Author :
Griot, Miguel ; Casado, Andres I Vila ; Wesel, Richard
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA
fYear :
2008
Firstpage :
1209
Lastpage :
1213
Abstract :
Parallel concatenated trellis coded modulation (PC- TCM) has been traditionally designed using parallel concatenated convolutional codes with a bits-to-symbol mapper. However, this paper shows that for higher-order modulations using linear codes is too restrictive. Parallel Concatenated Nonlinear Trellis Coded Modulation (PC-NLTCM) that directly assigns constellation points as output-labels to the branches of the trellis can outperform PC-TCM. Simulation results are shown for a 2 bits/s/Hz 16-state nonlinear turbo code with 8PSK. This code is less than 0.43 dB away from the Shannon limit at a BER = 10 5 with an interleaver length of 10000 bits, and outperforms previous published linear turbo code by around 0.2 dB. This paper also provides an extension of Benedetto´s uniform interleaver analysis for nonlinear constituent codes, which accurately predicts the BER of the PC-NLTCM at high SNR.
Keywords :
concatenated codes; convolutional codes; error statistics; nonlinear codes; phase shift keying; trellis coded modulation; turbo codes; BER; Shannon limit; bits-to-symbol mapper; higher-order modulations; linear codes; nonlinear turbo codes; parallel concatenated convolutional codes; parallel concatenated trellis coded modulation; Bit error rate; Communications Society; Concatenated codes; Convolutional codes; Decision feedback equalizers; Linear code; Modulation coding; Peer to peer computing; Table lookup; Turbo codes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
Type :
conf
DOI :
10.1109/ICC.2008.236
Filename :
4533272
Link To Document :
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