An adaptive soft-output Viterbi equalizer for fast time-varying frequency-selective fading.
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| Title: | An adaptive soft-output Viterbi equalizer for fast time-varying frequency-selective fading. |
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| Authors: | Nagayasu, Takayuki1, Kubo, Hiroshi1, Murakami, Keishi1, Fujino, Tadashi1 |
| Source: | Electronics & Communications in Japan, Part 1: Communications. Apr1998, Vol. 81 Issue 4, p31-39. 9p. |
| Subject Terms: | *PROBABILITY theory, *ESTIMATION theory, EQUALIZERS (Electronics), ELECTRIC filters, ELECTRIC networks, RADIO transmitter fading |
| Abstract: | 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] |
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| Database: | Business Source Index |
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