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标题：OFDM用低位相雑音局部発振器の設計と搬送波のS/N特性検討
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作者：山本昭夫 ; 西村恵造
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：1997
卷号：51
期号：9
页码：1476-1485
DOI：10.3169/itej.51.1476
出版社：The Institute of Image Information and Television Engineers
摘要：Orthogonal frequency division multiplexing (OFDM) is a suitable digital modulation method for terrestrial digital broadcasting systems. However, the phase noise in an OFDM receiver must be reduced, because the phase noise disturbs the orthogonality among the OFDM sub-carriers. This report describes the design of a wideband tunable local oscillator with low phase noise characteristics for OFDM receivers. We have developed a balanced oscillator with an L-C parallel resonance circuit between the transistor emitter ports, which has a wide band frequency range of 1.15-2.2 GHz and low phase noise performances of-66 dBc/Hz (1-kHz offset) or less. We also calculated the SNR at the output of the tuner of OFDM sub-carriers by using this balanced oscillator, and the results show that the SNRs of 33dB or more are achievable even for the 1-kHz sub-carrier spacing system.
关键词：OFDM;位相雑音;広帯域可変;局部発振器;搬送波;S/N特性