Realization of simple decoders for high-coding-rate convolutional codes.
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| Title: | Realization of simple decoders for high-coding-rate convolutional codes. |
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| Authors: | Kawazoe, Katsuhiko1, Kubota, Shuji1 |
| Source: | Electronics & Communications in Japan, Part 1: Communications. Mar1998, Vol. 81 Issue 3, p47-56. 10p. |
| Subject Terms: | *TELECOMMUNICATION satellites, *TELECOMMUNICATION systems, DECODERS (Electronics), COMPLEMENTARY metal oxide semiconductors, CODING theory, ELECTRONICS |
| Abstract: | This paper describes a method to configure pre-decoders for the high coding rate convolution codes needed when the SST method is used, thus enabling low power consumption in a Viterbi decoder. The proposed pre-decoders have no correcting capability, but do allow decoding of convolution codes with a minimum of hardware. The configuration method is studied here for general convolution codes with a constraint length K and a coding rate n/m. A specific circuit configuration for a pre-decoder is presented for the commonly used, punctured type, high coding rate convolution codes with coding rates ¾ to 7/8 and 15/16. The use of the SST method is now possible for high coding rate codes. The gate operates with a coding rate of 7/8 and an error rate after decoding of 10-4 that is 40% of that in the conventional type. Hence, a low power consumption Viterbi decoder is possible. As an example of the proposed high coding rate pre-decoder, a high-speed transmission error rate estimation circuit is proposed and its characteristics are obtained. © 1998 Scripta Technica. Electron Comm Jpn Pt. 1, 81(3): 47–56, 1998 [ABSTRACT FROM AUTHOR] |
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| Database: | Business Source Index |
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