The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Radix-trellis Viterbi Decoding of TCM/PSK using Metric Quantization

TCM/PSK의 양지화 Radix-trellis Viterbi 복호

  • Published : 2000.08.01
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Abstract

In this paper we propose a decoding algorithm of Ungerboeck TCM/PSK in the concept of Radix-trellis, which has been applied to the decoding of convolutional codes for the high speed decoding. As an example we choose 16-state trellis coded 8-ary PSK. For Radix-4 and Radix-16 trellis decoding, we explain the path metric(PM) and the branch metric(BM) calculation. By using the simulation, we evaluate the bit error rate(BER) performance according to the number of binary digits for I-Q value, PM and BM registers. The proper number of binary digits of each register has been derived.

본 논문에서는 기존의 컨볼루션 부호화(강판정 비터비 알고리즘 사용)에 이용된 Radix-trellis 개념의 디코딩 방법을 Ungerboeck의 TCM/PSK 부호화 변조에 적용하여 TCM/PSK의 고속 복호 방식을 제안한다. 구체적인 예로서 16-stage, trellis 부호화 8-ary PSK의 경우를 다루었다. Radix-4와 Radix-16 격자 디코딩에 대하여 path metric(PM) 및 branch metric(BM) 값의 계산과정을 설명하고 모의 실험을 통하여 I-Q 값, branch metric 값 및 path metric 값 양자화 레벨에 따른 성능을 분석하여 이들의 적정 양자화 이진 심별(binary digit)수를 도출하였다.

Keywords

References

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