フェージング伝送路におけるOFDM用等化器の性能向上に関する一検討(<論文小特集>デジタル放送を支える伝送技術)

概要

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We have studied frequency-and time-domain equalization techniques under fading conditions for the European DVB-T OFDM system. We first describe a frequency-domain equalizer using simplified linear interpolation in the symbol direction that estimates the channel response of receiving-data carriers by using the pilot-carrier channel response. We calculated the signal-to-interference ratio (SIR) and the bit error rate (BER) over one-path and two-path Rayleigh-fading channels. We found that an SIR of about 20 dB and a BER of less than 1.5×10^<-3> (QPSK and 16 QAM) are obtained even for a maximum doppler frequency of 50 Hz in a 2-k FFT system. We next describe a simplified time-domain equalizer using step interpolation over the OFDM useful period. A simulated BER of 2×10^<-3> (QPSK) over one-path Rayleigh-fading channels (&frof;_d=50Hz)was attained for an 8-k FFT system, when the new time-domain and frequency-domain equalizer techniques were applied.
社団法人映像情報メディア学会の論文
1999-11-20