Journal ArticleDOI
Minimum distance estimates of the performance of sequential decoders
TLDR
Simple tests are derived that allow easy determination of the performance on the BSC of a given binary convolutional code decoded with a modified version of the Fano algorithm.Abstract:
In the past, criteria for predicting the performance of individual codes with sequential decoding have been intuitive. In this paper, simple tests are derived that allow easy determination of the performance on the BSC (binary symmetric channel) of a given binary convolutional code decoded with a modified version of the Fano algorithm. A "distance-guaranteed computational cutoff rate," R_{dgcomp} , is defined in terms of the BSC crossover probability and the "uniform minimum distance" of the code. The latter is a measure of the minimum distance between codewords of all lengths up to and including the constraint length of the code. A bound is derived on the average number of decoding computations and is shown to be small and insensitive to constraint length if the code rate, R , satisfies the test R . Also, the probability of a decoding error is overbounded and the bound decreases exponentially with constraint length with exponent (R_{dgcomp} - R) . Consequently, the probability of error is small if (R_{dgcom} - R) is large. The existence of binary convolutional codes with a uniform minimum distance which meets the Gilbert bound is demonstrated. This result is combined with the condition R to show the existence of codes of rate less than a rate R_{D} for which the average number of decoding computations is small. The rate R_{D} is approximately one half of the true computational cutoff rate R_{comp} on the BSC with crossover probability of 10^{-4} .read more
Citations
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Book
Algebraic Codes for Data Transmission
TL;DR: This paper presents codes and algorithms for majority decoding based on the Fourier transform, as well as algorithms based on graphs, for linear block codes and beyond BCH codes.
Journal ArticleDOI
An analysis of sequential decoding for specific time-invariant convolutional codes
P. Chevillat,D. Costello +1 more
TL;DR: It is proved that code construction for sequential decoding should maximize column-distance growth and free distance in order to guarantee fast decoding, a minimum erasure probability, and a low undetected error probability.
Journal ArticleDOI
Minimum weight convolutional codewords of finite length (Corresp.)
TL;DR: The tradeoff between d_{o} and the free distance d_{free} is obtained for small memory length codes and the minimum average weight per branch over all cycles is carried out.
Book ChapterDOI
Progress in Sequential Decoding
TL;DR: This chapter discusses the progress in sequential decoding, and describes the analysis, simulation, and construction of sequential decoders.
References
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Journal ArticleDOI
Error bounds for convolutional codes and an asymptotically optimum decoding algorithm
TL;DR: The upper bound is obtained for a specific probabilistic nonsequential decoding algorithm which is shown to be asymptotically optimum for rates above R_{0} and whose performance bears certain similarities to that of sequential decoding algorithms.
Journal ArticleDOI
A simple derivation of the coding theorem and some applications
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A heuristic discussion of probabilistic decoding
TL;DR: The invited Profess01 Fano to commit to paprr his elegant but, unelaborate explanation of the principles of sequential decoding, a scheme which is currently contending for a position as the most practical implementation of Shannon’s theory of noisy communication channels.
Journal ArticleDOI
A lower bound to the distribution of computation for sequential decoding
I. Jacobs,Elwyn R. Berlekamp +1 more
TL;DR: The performance of systems using sequential decoding is limited by the computational and buffer capabilities of the decoder, not by the probability of making a decoding error.
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A lower bound to the distribution of computation for sequential decoding
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