DocumentCode :
3355987
Title :
LT-AF codes: LT codes with Alternating Feedback
Author :
Talari, Ali ; Rahnavard, Nazanin
Author_Institution :
Oklahoma State Univ., Stillwater, OK, USA
fYear :
2013
fDate :
7-12 July 2013
Firstpage :
2646
Lastpage :
2650
Abstract :
LT codes are capacity achieving and flexible rateless codes that need a single-bit feedback to inform the encoder of the successful decoding. However, this weak feedback channel remains unused when the transmission is in progress. In addition, although LT codes are asymptotically capacity achieving, their performance significantly degrades for short block lengths. Consequently, we propose LT Codes with Alternating Feedback (LT-AF Codes) that considerably improve the performance of LT codes for short-block lengths when belief propagation decoder is in use. In our proposed scheme, the decoder alternatively issues two types of feedbacks based on the dependencies of the still undecoded received output symbols and the number of decoded input symbols. We propose two methods to form the latter type of feedback with a trade-off in their complexity and performance.
Keywords :
codes; decoding; LT-AF codes; alternating feedback; belief propagation decoder; decoding; flexible rateless code; short-block length; single-bit feedback; Bit error rate; Complexity theory; Decoding; Encoding; Iterative decoding; Robustness;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory Proceedings (ISIT), 2013 IEEE International Symposium on
Conference_Location :
Istanbul
ISSN :
2157-8095
Type :
conf
DOI :
10.1109/ISIT.2013.6620706
Filename :
6620706
Link To Document :
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