文章基本信息

标题：地上デジタルテレビジョン放送の伝送特性とIMに関する一検討
本地全文：下载
作者：三木信之 ; 北沢誠
期刊名称：映像情報メディア学会誌
印刷版ISSN：1342-6907
电子版ISSN：1881-6908
出版年度：2000
卷号：54
期号：7
页码：1069-1078
DOI：10.3169/itej.54.1069
出版社：The Institute of Image Information and Television Engineers
摘要：When an orthogonal frequency division multiplexing (OFDM) signal passes through a non-linear power amplifier, inter-modulation (IM) occurs. Third distortion components of the IM exist in the OFDM band, degrading the bit error rate (BER). Because the in-band IM cannot be measured directly, this phenomenon has not been analyzed thoroughly. The TM is introduced into the OFDM by the non-linearity of the transmission equipment. It changes the C/N of each carrier, leading to variations in their BERs. The overall BER of the OFDM signal is calculated by adding and averaging the carrier BERs. Using mathematical representations of the above, we have theoretically and experimentally shown that the equivalent C/N degradation due to IM from the reference C/N (22 dB), where the BER of error correction-free 64 QAM-OFDM is 9.7 × 10^-3, can be obtained directly by measuring the IM near the OFDM band, without measuring the carrier BERs.
关键词：OFDM;地上デジタルテレビジョン放送;IM;混変調;相互変調;等価C/N劣化量