1
Toshio Nojima, Sadayuki Nishiki: Impedance-matched, class F high-frequency amplifier. Nippon Telegraph and Telephone Company, Cushman Darby & Cushman, September 8, 1992: US05146178 (91 worldwide citation)

An impedance matched class-F high frequency amplifier includes an input matching circuit receiving high frequency signals connected to the gate of the FET. The drain of the FET is connected to an output matching circuit which matches the fundamental frequency and the second harmonic frequency, and t ...


2
Yasunori Suzuki, Ning Chen, Yoshiaki Tarusawa, Toshio Nojima: Communication system using optical fibers. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, March 14, 2006: US07013087 (84 worldwide citation)

A divider/combiner unit combines RF signals, then converts the combined signal into an optical signal and sends it over an optical fiber. N radio access units each convert the optical signal received from the optical fiber into an RF signal and transmits it from an antenna, and each radio access uni ...


3
Yoshiaki Tarusawa, Shigeki Saito, Yasushi Yamao, Toshio Nojima: Frequency synthesizer having compensation for nonlinearities. Nippon Telegraph and Telephone Corporation, Cushman Darby & Cushman, December 25, 1990: US04980652 (82 worldwide citation)

In a phase locked loop frequency synthesizer, the frequency of a VCO is switched by changing the division ratio of a variable ratio frequency divider in the feedback path of the loop. At the time of switching, a prepositioning voltage is applied to the VCO to realize fast frequency switching. To cor ...


4
Yasunori Suzuki, Toshio Nojima: Feed-forward amplifier. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, May 21, 2002: US06392483 (76 worldwide citation)

In a feed-forward amplifier a signal power dynamic range compressing circuit for compressing the power dynamic range of the input signal to the feed-forward amplifier is provided in a distortion detecting loop at the input side of a main amplifier, and the output backoff of the main amplifier is red ...


5
Yoshiaki Tarusawa, Toshio Nojima, Yasushi Ito: Fiber optics transmission system. NTT Mobile Communications Networks, Pollock Vande Sande & Priddy, September 22, 1998: US05812296 (75 worldwide citation)

In a fiber optics transmission system in which a plurality of access units are cascade-connected via up-link and down-link optical fiber lines and connected to a base unit, the base unit has a beat noise detector and a noise information generator and, upon detection of beat noise, noise information ...


6
Kouji Chiba, Toshio Nojima, Yasushi Yamao, Shigeru Tomisato, Tadao Takami: Linear transmitter. Nippon Telegraph & Telephone Corporation, Cushman Darby & Cushman, October 5, 1993: US05251330 (73 worldwide citation)

This invention relates to a linear transmitter which controls the bias voltage of either the drain electrode or collector electrode of an amplifier for radio frequency based on the envelope of the modulated signal, and is characterized in that it controls the bias voltage of the radio frequency ampl ...


7
Ryo Yamaguchi, Noriyoshi Terada, Toshio Nojima: Mobile communication base station equipment. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, June 14, 2005: US06907269 (72 worldwide citation)

A mobile communication base station determines the oncoming direction of a radio wave with a simple arrangement and transmits a narrow angle beam in this direction. Received signals from a pair of wide angle beam antennae 21-1 and 21-2 having an equal configuration and a common orientation and which ...


8
Yasunori Suzuki, Ken Kumagai, Toshio Nojima: Digital signal detecting method and detector. NTT Mobile Communications Network, Pollock Vande Sande & Amernick, May 25, 1999: US05907585 (66 worldwide citation)

An automatically gain-controlled analog received signal is AD converted to a digital signal, which is subjected to quadrature demodulation processing through operation. The quadrature demodulation result is subjected to low-pass filter processing through operation, that is, a digital detection is pe ...


9
Yasunori Suzuki, Ken Kumagai, Toshio Nojima: Method and apparatus for transmission and reception. Nippon Telegraph & Telephone Corporation, Pollock Vande Sande & Amernick RLLP, January 23, 2001: US06178158 (66 worldwide citation)

In a method for transmission and reception over N transmission channels, the transmitting side performs orthonormal transform processing of N-channel modulated signals so that the resulting transformed output signals have lower cross-correlation, and the transformed N-channel signals are multiplexed ...


10
Shoichi Narahashi, Toshio Nojima, Makoto Maeta, Kazuaki Murota: Feed-forward amplifier. Nippon Telegraph and Telephone Corporation, Pollock Vande Sande and Priddy, November 24, 1992: US05166634 (51 worldwide citation)

In a feed-forward amplifier which has an error detection circuit for detecting a nonlinear distortion component of a main amplifier and an error rejection circuit for amplifying the detected distortion component by an auxiliary amplifier and injecting it into the main amplifier to cancel an error co ...