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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
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Committee Date Time Place Paper Title / Authors Abstract Paper #
AP 2019-02-22
Osaka Sumitomo Electric Industries (Osaka Works) [Invited Lecture] A Study on the Specificity of Nonlinear Distortion Radiation in Multitone Transmission using 4.65GHz Band Massive Element Active Antenna System for 5G
Takuji Mochizuki, Masashi Hirabe, Tomohiro Kikuma, Makoto Hayakawa, Daisuke Nose (NEC) AP2018-178
When operating the Sub6GHz-band massive element Active Antenna System (AAS) for 5 G in high power region, Downlink (DL) ... [more] AP2018-178
Tokyo Tokyo Institute of Technology Development and Basic Characteristics of Low-SHF-Band Massive Element Active Antenna System for 5G
Daisuke Nose, Kazuo Tanada, Toshifumi Sato, Yasushi Maruta, Takuji Mochizuki, Masashi Hirabe, Makoto Hayakawa (NEC), Tatsuki Okuyama, Jun Mashino, Satoshi Sumaya, Yukihiko Okumura (NTT DOCOMO) RCS2016-310
Capacity enhancement is desired to deal with rapid increase of data traffic as one of key requirements for 5G. We focus ... [more] RCS2016-310
MW, ED 2015-01-16
Tokyo Kikai-Shinko-Kaikan Bldg. Digital Doherty Transmitter with Envelope ΔΣ Modulated Class-D GaN Amplifier for 800 MHz band
Keiichi Motoi (NEC), Andreas Wentzel (FBH), Masaaki Tanio, Shinichi Hori, Makoto Hayakawa (NEC), Wolfgang Heinrich (FBH), Kazuaki Kunihiro (NEC) ED2014-131 MW2014-195
This paper presents a novel transmitter (Tx) architecture combining voltage-mode class-D power amplifiers (PAs) with an ... [more] ED2014-131 MW2014-195
MW, ED 2015-01-16
Tokyo Kikai-Shinko-Kaikan Bldg. A Linear and Efficient 1-bit Digital Transmitter with Envelope Delta-sigma Modulation
Masaaki Tanio, Shinichi Hori, Makoto Hayakawa, Noriaki Tawa, Keiichi Motoi, Kazuaki Kunihiro (NEC) ED2014-132 MW2014-196
 [more] ED2014-132 MW2014-196
SIP, RCS 2013-02-01
Hiroshima Viewport-Kure-Hotel (Kure) A Study on Clipping Noise Suppression of Speech Based on Weighted Spectral Envelope on Divided Frequency Bands
Makoto Hayakawa, Takahiro Fukumori, Masato Nakayama, Takanobu Nishiura (Ritsumeikan Univ.) SIP2012-101 RCS2012-258
In the speech recording, a speech quality is degraded with clipping noise when the amplitude of input signal exceeds the... [more] SIP2012-101 RCS2012-258
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