地上デジタルテレビジョン放送の伝送特性とマルチパスに関する一検討

概要

論文の詳細を見る
The variance of the bit error rate (BER) of orthogonal frequency division multiplexing (OFDM) transmission with the delay time and the phase of the multi-path has not yet been sufficiently clarified. Multi-path introduces amplitude ripples into OFDM transmission, and these ripples change the C/N of each carrier. These changes, in turn, lead to variations in the BER of each carrier. The BER of the entire OFDM is calculated by adding and averaging the carrier-by-carrier BERs. Using mathematical representations of these factors, we theoretically and experimentally demonstrated that the equivalent C/N degradation from a reference C/N of 22 dB, where the BER of error-correction-free 64-QAM OFDM is 0.009679, oscillates periodically at a delay of 1/(OFDM bandwidth) and approaches the average value as the delay time increases. We found that the BER has either local maxima or local minima at a delay time equivalent to 1/(1・(OFDM carrier interval)), where 1 is a positive integer.
社団法人映像情報メディア学会の論文
2001-01-20