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An adaptive soft-output Viterbi equalizer for fast time-varying frequency-selective fading.

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Název: An adaptive soft-output Viterbi equalizer for fast time-varying frequency-selective fading.
Autoři: Nagayasu, Takayuki1, Kubo, Hiroshi1, Murakami, Keishi1, Fujino, Tadashi1
Zdroj: Electronics & Communications in Japan, Part 1: Communications. Apr1998, Vol. 81 Issue 4, p31-39. 9p.
Témata: *PROBABILITY theory, *ESTIMATION theory, EQUALIZERS (Electronics), ELECTRIC filters, ELECTRIC networks, RADIO transmitter fading
Abstrakt: In this paper, an adaptive soft-output Viterbi equalizer (SOVE) is proposed for fast time-varying frequency-selective fading. The demodulator can make a symbol-by-symbol or bit-by-bit soft-decision based on a posteriori probabilities. The proposed adaptive SOVE has the following advantages: (1) it has a superior tracking ability for fast time-varying frequency-selective fading, (2) it works in blind if the coding rules are suitably designed, and (3) a good BER is obtained at the output of the decoder by introducing interleaves. In this paper, these advantages are confirmed by computer simulations. In particular, in the presence of frequency-selective fading, we can show that the proposed method is superior to adaptive maximum-likelihood sequence estimation which carries equalizing and decoding simultaneously. © 1998 Scripta Technica. Electron Comm Jpn Pt 1, 81(4): 31–39, 1998 [ABSTRACT FROM AUTHOR]
Copyright of Electronics & Communications in Japan, Part 1: Communications is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: An adaptive soft-output Viterbi equalizer for fast time-varying frequency-selective fading.
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  Data: <searchLink fieldCode="AR" term="%22Nagayasu%2C+Takayuki%22">Nagayasu, Takayuki</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kubo%2C+Hiroshi%22">Kubo, Hiroshi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Murakami%2C+Keishi%22">Murakami, Keishi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fujino%2C+Tadashi%22">Fujino, Tadashi</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Electronics+%26+Communications+in+Japan%2C+Part+1%3A+Communications%22">Electronics & Communications in Japan, Part 1: Communications</searchLink>. Apr1998, Vol. 81 Issue 4, p31-39. 9p.
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  Data: *<searchLink fieldCode="DE" term="%22PROBABILITY+theory%22">PROBABILITY theory</searchLink><br />*<searchLink fieldCode="DE" term="%22ESTIMATION+theory%22">ESTIMATION theory</searchLink><br /><searchLink fieldCode="DE" term="%22EQUALIZERS+%28Electronics%29%22">EQUALIZERS (Electronics)</searchLink><br /><searchLink fieldCode="DE" term="%22ELECTRIC+filters%22">ELECTRIC filters</searchLink><br /><searchLink fieldCode="DE" term="%22ELECTRIC+networks%22">ELECTRIC networks</searchLink><br /><searchLink fieldCode="DE" term="%22RADIO+transmitter+fading%22">RADIO transmitter fading</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this paper, an adaptive soft-output Viterbi equalizer (SOVE) is proposed for fast time-varying frequency-selective fading. The demodulator can make a symbol-by-symbol or bit-by-bit soft-decision based on a posteriori probabilities. The proposed adaptive SOVE has the following advantages: (1) it has a superior tracking ability for fast time-varying frequency-selective fading, (2) it works in blind if the coding rules are suitably designed, and (3) a good BER is obtained at the output of the decoder by introducing interleaves. In this paper, these advantages are confirmed by computer simulations. In particular, in the presence of frequency-selective fading, we can show that the proposed method is superior to adaptive maximum-likelihood sequence estimation which carries equalizing and decoding simultaneously. © 1998 Scripta Technica. Electron Comm Jpn Pt 1, 81(4): 31–39, 1998 [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Electronics & Communications in Japan, Part 1: Communications is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/(SICI)1520-6424(199804)81:4<31::AID-ECJA4>3.0.CO;2-A
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      – Code: eng
        Text: English
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      – SubjectFull: PROBABILITY theory
        Type: general
      – SubjectFull: ESTIMATION theory
        Type: general
      – SubjectFull: EQUALIZERS (Electronics)
        Type: general
      – SubjectFull: ELECTRIC filters
        Type: general
      – SubjectFull: ELECTRIC networks
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      – SubjectFull: RADIO transmitter fading
        Type: general
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      – TitleFull: An adaptive soft-output Viterbi equalizer for fast time-varying frequency-selective fading.
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            NameFull: Nagayasu, Takayuki
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            NameFull: Kubo, Hiroshi
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            NameFull: Murakami, Keishi
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            – D: 01
              M: 04
              Text: Apr1998
              Type: published
              Y: 1998
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