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Protograph-Based Raptor-Like CodesTheoretical analysis has long indicated that feedback improves the error exponent but not the capacity of pointto- point memoryless channels. The analytic and empirical results indicate that at short blocklength regime, practical rate-compatible punctured convolutional (RCPC) codes achieve low latency with the use of noiseless feedback. In 3GPP, standard rate-compatible turbo codes (RCPT) did not outperform the convolutional codes in the short blocklength regime. The reason is the convolutional codes for low number of states can be decoded optimally using Viterbi decoder. Despite excellent performance of convolutional codes at very short blocklengths, the strength of convolutional codes does not scale with the blocklength for a fixed number of states in its trellis.
Document ID
20140002368
Acquisition Source
Headquarters
Document Type
Other - NASA Tech Brief
Authors
Divsalar, Dariush
(California Inst. of Tech. Pasadena, CA, United States)
Chen, Tsung-Yi
(California Univ. Los Angeles, CA, United States)
Wang, Jiadong
(California Univ. Los Angeles, CA, United States)
Wesel, Richard D.
(California Univ. Los Angeles, CA, United States)
Date Acquired
March 26, 2014
Publication Date
January 1, 2014
Publication Information
Publication: NASA Tech Briefs, January 2014
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
NPO-48128
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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