Naoki Hongo
Hitachi
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Publication
Featured researches published by Naoki Hongo.
vehicular technology conference | 2003
Naoki Hongo; Tetsuhiko Miyatani; Yoshihiko Akaiwa
The even-order distortion at baseband perturbs bias conditions of a power amplifier (PA), and creates a new odd-order distortion, which shows a hysteresis effect on AM-AM and AM-PM characteristics. This effect combined with the original odd-order distortion generates imbalanced inter modulation distortion (IMD) outside of the signal bandwidth, which depends on frequency separation. The imbalanced IMD limits the compensation performance of conventional predistorters. We propose a new predistorter for W-CDMA base stations. The predistorter compensates the distortion to less than 60 dBc, even if the PA is affected by even-order distortion. The PA model and the adaptive algorithm are also shown.
Archive | 2008
Manabu Nakamura; Yasuhiro Takeda; Yoichi Okubo; Masaru Adachi; Naoki Hongo
Archive | 2004
Naoki Hongo; Tetsuhiko Miyatani; Yoshihiko Akaiwa
Archive | 2001
Masato Horaguchi; Naoki Hongo; Takashi Uchida; Masaki Suto; Toshio Takada
Archive | 2005
Satoshi Furuta; Naoki Hongo
Archive | 2006
Yoichi Okubo; Yasuhiro Takeda; Manabu Nakamura; Naoki Hongo; Masaru Adachi
Archive | 2002
Naoki Hongo; Yoichi Okubo; Masaki Suto; Masato Horaguchi; Toshio Takada; Tetsuhiko Miyatani
Archive | 2005
Satoshi Furuta; Naoki Hongo
Archive | 2002
Yoichi Okubo; Kiyoshi Funada; Masaki Suto; Masato Horaguchi; Toshio Takada; Naoki Hongo
Archive | 2009
Naoki Hongo
