1
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 ...


2
Shigeru Tomisato, Hiroshi Suzuki: Frequency diversity transmitter and receiver. NTT Mobile Communication Network, Cushman Darby & Cushman, April 2, 1996: US05504783 (71 worldwide citation)

A frequency diversity communication system is provided whereby the number of hopping channels is reduced and a more continuous communication achieved as a mobile station travels from cell to cell by the combination of chips of symbols from the mobile sources. The transmitter divides each symbol of a ...


3
Tetsushi Abe, Hiromasa Fujii, Shigeru Tomisato, Tadashi Matsumoto: Turbo-reception method and turbo-receiver. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, April 11, 2006: US07027533 (42 worldwide citation)

An impluse response hmn(q) of each transmission path is estimated from N received signals rm (m=1, . . . , M) and a known signal (for a number of users equal to N, n=1, . . . , N). M×N matrix H (q) having hmn(q) as an element and a Q×Q matrix H having H(q) as an element are determined (where Q repre ...


4
Takefumi Yamada, Shigeru Tomisato, Tadashi Matsumoto: Adaptive equalization apparatus and method. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, October 3, 2006: US07116735 (17 worldwide citation)

A correlation between a received signal and a sync word signal is calculated. A window signal having a time span which is equal to an equalization range for an adaptive equalizer is defined. A power sum of the correlation output signal in each of window signals #1, #2, #3, . . . are calculated by se ...


5
Shigeru Tomisato, Hiroshi Suzuki, Kenkichi Hirade: High-speed radio communication system. NTT Mobile Communications Network, Oblon Spivak McClelland Maier & Neustadt P C, October 13, 1998: US05822701 (16 worldwide citation)

Centralized controlling apparatus controls overall flow of signals. Calling apparatus transmits a call signal in response to a call instruction signal transmitted from the centralized controlling apparatus. Information receiving apparatus receives the call signal to transmit an answer signal. Answer ...


6
Hiromasa Fujii, Shigeru Tomisato, Hirohito Suda, Tetsushi Abe, Takefumi Yamada: Communications system, communications method, transmitting apparatus, receiving apparatus and control program to variably adjust a symbol length. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt L, December 15, 2009: US07633924 (14 worldwide citation)

An object of the present invention is to provide a communications system etc., which can reduce the influence of interference from other systems which results from a difference in symbol length, in an area where a plurality of systems using different transmission methods are mixed. The present inven ...


7
Hiromasa Fujii, Tetsushi Abe, Shigeru Tomisato, Hirohito Suda: Adaptive equalizing apparatus and program therefor. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, May 8, 2007: US07215704 (7 worldwide citation)

In an adaptive equalizing apparatus for MIMO (Multi-Input Multi-Output) turbo reception, an interference component in a received signal is subtracted therefrom using a replica of an interference component in an interference canceling part 31n, the subtracted output is filtered by a filter 32n, to ca ...


8
Tetsushi Abe, Hirohito Suda, Shigeru Tomisato, Hiromasa Fujii, Takefumi Yamada: OFDM signal frame generator, transmitter, signal transmission system and OFDM signal frame generating method. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt L, November 17, 2009: US07619963 (6 worldwide citation)

An OFDM signal frame generator includes a rate determiner configured to determine rate information to generate a signal frame to be transmitted as an OFDM signal based on a value of a received signal quality. The signal frame generator further includes a pilot and data arrangement format determiner ...


9
Hiromasa Fujii, Shigeru Tomisato, Hirohito Suda: Radio receiver, radio transmitter and impedance control method. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, February 28, 2006: US07006041 (6 worldwide citation)

A radio receiver includes a plurality of antenna elements for receiving a radio signal from a radio transmitter; a setting part changing an impedance of at least one of the plurality of antenna elements according to an instruction signal; a measuring part measuring a change in throughput in a receiv ...


10
Hiromasa Fujii, Tetsushi Abe, Shigeru Tomisato, Hirohito Suda: MIMO receiver and method of reception therefor. NTT Docomo, Oblon Spivak McClelland Maier & Neustadt P C, December 19, 2006: US07151808 (6 worldwide citation)

The accuracy of an equalization start timing, an equalization duration and a channel estimation is improved in an application including an increased number of users. An equalization start timing t0, an equalization duration te and channel H estimation are performed for each user signal, and using th ...