DocumentCode :
1340493
Title :
Multilevel turbo coding with short interleavers
Author :
Herzberg, Hanan
Author_Institution :
GlobeSpan Technol. Inc., Red Bank, NJ., USA
Volume :
16
Issue :
2
fYear :
1998
fDate :
2/1/1998 12:00:00 AM
Firstpage :
303
Lastpage :
309
Abstract :
The impact of the interleaver, embedded in the encoder for a parallel concatenated code, called the turbo code, is studied. The known turbo codes consist of long random interleavers, whose purpose is to reduce the value of the error coefficients. It is shown that an increased minimum Hamming distance can be obtained by using a structured interleaver. For low bit-error rates (BERs), we show that the performance of turbo codes with a structured interleaver is better than that obtained with a random interleaver. Another important advantage of the structured interleaver is the short length required, which yields a short decoding delay and reduced decoding complexity (in terms of memory). We also consider the use of turbo codes as component codes in multilevel codes. Powerful coding structures that consist of two component codes are suggested. Computer simulations are performed in order to evaluate the reduction in coding gain due to suboptimal iterative decoding. From the results of these simulations we deduce that the degradation in the performance (due to suboptimal decoding) is very small
Keywords :
coding errors; computational complexity; concatenated codes; decoding; delays; error statistics; interleaved codes; iterative methods; random processes; coding gain reduction; component codes; computer simulations; error coefficients; long random interleavers; low bit-error rates; memory; minimum Hamming distance; multilevel turbo coding; parallel concatenated code; reduced decoding complexity; short decoding delay; short interleavers; simulations; structured interleaver; suboptimal iterative decoding; turbo codes; Bit error rate; Computational modeling; Computer simulation; Concatenated codes; Delay; Hamming distance; Iterative decoding; Performance evaluation; Performance gain; Turbo codes;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/49.661118
Filename :
661118
Link To Document :
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