Simplified implementation of a soft decision threshold decoder

New fully digital hardware designs for soft-decision threshold decoders are introduced to significantly reduce the complexity and increase the coding gain as compared to previously proposed architectures. These designs are useful for high-rate self-orthogonal convolutional codes with a long constrai...

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Bibliographic Details
Main Authors: Gagnon, F., Batani, N., Dam, T.Q.
Format: Conference Proceeding
Language:English
Subjects:
Convolutional codes
Costs
Decoding
Degradation
Digital communication
Feedback
Hardware
Quantization
Very large scale integration
Online Access:Request full text
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Summary:New fully digital hardware designs for soft-decision threshold decoders are introduced to significantly reduce the complexity and increase the coding gain as compared to previously proposed architectures. These designs are useful for high-rate self-orthogonal convolutional codes with a long constraint length. The study case considered in this paper is for a rate 23/24, constraint length 4056 code used in a typical microwave digital radio. The new decoder architecture provides a four-fold decrease in complexity and an additional 0.3 dB coding gain as compared to previous designs. The simplification of the decoding architectures is possible through the use of three techniques: a different processing of feedback, the separation of information bit and reliability bit processing and the use of partial reencoding.< >
DOI:10.1109/GLOCOM.1993.318156