室内伝送実験によるOFDM用キャリアインタリーバの検討

概要

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This paper discusses characteristics of the carrier interleavers for OFDM transmission systems through indoor hardware experiments. The carrier interleavings considered here are : i) group-interleaving, ii) carrier-interleaving within a group, and iii) two-stage interleaving (the combination of i) and ii)). We measured the required C/Ns (BER=2×10^<-4>) over two-path channels of D/U=10 dB with short (0.2μs) through long (25μs) delay times. The results show that the interleaving scheme and its parameters (the number of carriers per group) affect the required C/Ns. With suitable selection of the scheme, the interleaving gain can be about 2 dB or more. We also show the characteristic tendencies over multi-path channels with more than two-path are almost same as those in the two-path channels. Finally, we describe a few techniques for the frequency-domain equalizer and the Viterbi decoder so as to improve the transmission performance. Numerical examples show that improvement of 4 dB or more is realized by using CSI (channel state information) for the soft decision Viterbi Algorithm.
社団法人映像情報メディア学会の論文
1998-05-29