公开(公告)号：US20170104456A1

公开(公告)日：2017-04-13

申请号：US15123023

申请日：2014-10-29

申请人： NEC Corporation

发明人： Keiichi MOTOI ,  Kazumi SHIIKUMA ,  Shinichi HORI

IPC分类号： H03F1/02 ,  H03F3/19 ,  H04B1/04 ,  H03F3/24

CPC分类号： H03F1/0288 ,  H03F1/56 ,  H03F3/19 ,  H03F3/217 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/171 ,  H03F2200/336 ,  H03F2200/387 ,  H03F2200/451 ,  H04B1/0475 ,  H04B2001/0408

摘要： A transmitter according to an exemplary aspect of the present invention includes: a modulation circuit configured to modulate a baseband signal into a multi-bit digital signal including a component in a radio-frequency band; a plurality of switch-mode power amplifiers corresponding to each bit of the multi-bit digital signal output from the modulation circuit; and a signal synthesis circuit including a band limiting unit configured to perform a band limitation on output signals from the plurality of switch-mode power amplifiers, and a plurality of voltage-to-current converting units configured to perform a voltage-to-current conversion on respective output signals from the plurality of switch-mode power amplifiers, the signal synthesis circuit configured to makes a synthesized signal connecting the band limiting unit and the plurality of voltage-to-current converting units, wherein, depending on an output power at a synthesis point where the synthesized signal is made, a switch-mode power amplifier is selected which is configured to receive input of a pulse, and a pulse number of pulses to be inputted into the selected switch-mode power amplifier is controlled.

公开(公告)号：US20160248470A1

公开(公告)日：2016-08-25

申请号：US15027767

申请日：2014-10-15

申请人： NEC CORPORATION

发明人： Kazuaki KUNIHIRO ,  Shinichi HORI

IPC分类号： H04B1/44 ,  H03F3/24 ,  H04B1/3827 ,  H04L27/36 ,  H03F3/195 ,  H04L27/38 ,  H03F3/217 ,  H03F3/213

CPC分类号： H04B1/44 ,  H03F3/195 ,  H03F3/213 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/245 ,  H03F2200/171 ,  H03F2200/294 ,  H03F2200/331 ,  H03F2200/451 ,  H04B1/3833 ,  H04L27/36 ,  H04L27/38

摘要： A transmitter/receiver apparatus including: a transmitter/receiver terminal; a switching amplifier that includes a low-side switching element connected between a ground terminal and a pulse output terminal and a high-side switching element connected between the pulse output terminal and a power supply terminal and that outputs a pulse signal from the pulse output terminal; a filter that passes therethrough and outputs as a transmitted signal a predetermined frequency component of the pulse signal from a transmitter terminal; and a transmit/receive switch unit that switches the connection status between the transmitter/receiver terminal and the transmitter terminal and also switches the connection status between the transmitter/receiver terminal and a receiver terminal. During receiving, on the basis of the connection status between the transmitter/receiver terminal and the transmitter terminal, the low-side and high-side switching elements are fixed to conductive and non-conductive states, respectively, to non-conductive and conductive states, respectively, or both to non-conductive states.

摘要翻译： 一种发射机/接收机装置，包括：发射机/接收机终端; 开关放大器，包括连接在接地端子和脉冲输出端子之间的低侧开关元件和连接在脉冲输出端子和电源端子之间的高侧开关元件，并且从脉冲输出端子输出脉冲信号 ; 滤波器，其通过其并作为发送信号从发射机终端输出脉冲信号的预定频率分量; 以及发送/接收终端与发送终端之间的连接状态切换的发送接收开关单元，也切换发送接收端与接收端之间的连接状态。 在接收期间，基于发射机/接收机终端与发射机终端之间的连接状态，低侧和高侧开关元件分别被固定为导电和非导通状态，以非导通和导通状态 ，或两者分别为非导通状态。

公开(公告)号：US20160204970A1

公开(公告)日：2016-07-14

申请号：US15022802

申请日：2014-04-17

申请人： NEC CORPORATION

发明人： Shinichi HORI

IPC分类号： H04L27/34 ,  H04L27/36 ,  H04B1/04

CPC分类号： H04L27/3405 ,  H03F1/0294 ,  H03F1/32 ,  H03F3/217 ,  H03F3/2173 ,  H04B1/04 ,  H04L27/365

摘要： According to an embodiment, a digital transmitter (1) includes an amplitude modulation amplitude signal generation unit (132) that generates a function f(A(t)) of an amplitude signal A(t) as an amplitude modulation amplitude signal A′(t), an amplitude modulation phase signal generation unit (133) that calculates “cos−1{A(t)/f(A(t))}” as a phase θ1(t) and generates amplitude modulation phase signals P1(t) and P2(t), an individual digital transmission unit (11) that generates an amplified RF-pulse signal based on the signals A′(t) and P1(t), an individual digital transmission unit (12) that generates an amplified RF-pulse signal based on the signals A′(t) and P2(t), and an RF-synthesizer (16) that combines outputs of the individual digital transmission units (11, 12) with each other.

摘要翻译： 根据实施例，数字发送器（1）包括幅度调制幅度信号生成单元（132），其生成幅度信号A（t）的函数f（A（t））作为幅度调制幅度信号A' 1）（t），产生振幅调制相位信号生成单元（133），该调幅相位信号生成单元计算“cos-1 {A（t）/ f（A（t））}”作为相位 （t）和P2（t），根据信号A'（t）和P1（t）产生放大的RF脉冲信号的单独数字传输单元（11），产生 基于信号A'（t）和P2（t）的放大RF脉冲信号，以及组合各个数字传输单元（11,12）的输出的RF合成器（16）。

公开(公告)号：US20220149939A1

公开(公告)日：2022-05-12

申请号：US17171131

申请日：2021-02-09

申请人： NEC Corporation

发明人： Shinichi HORI ,  Yuma KASE

IPC分类号： H04B10/11 ,  H04B10/548 ,  H04L7/00

摘要： An optical wireless transmission system 10 includes a transmission device including at least one memory storing instructions, and at least one processor configured to execute the instructions to; generate a plurality of digital outphasing signals; orthogonally modulate the digital outphasing signals at an intermediate frequency; and set an intermediate frequency for satisfying a specified signal-to-distortion power ratio based on a sampling frequency, wherein the digital outphasing signals are orthogonally modulated at the intermediate frequency; a hardware optical fiber module configured to convert orthogonally modulated digital electrical signals into optical signals, transmit the optical signals through an optical fiber, and convert the optical signals into digital electrical signals; and a remote unit configured to combine the digital electrical signals transmitted by the hardware optical fiber module, and transmit a combined signal as a radio signal.

公开(公告)号：US20170230017A1

公开(公告)日：2017-08-10

申请号：US15501257

申请日：2015-04-24

申请人： NEC Corporation

发明人： Shinichi HORI

IPC分类号： H03F3/217 ,  H03F3/193 ,  H04B1/04 ,  H03F1/22

CPC分类号： H03F3/2171 ,  H03F1/223 ,  H03F3/193 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/245 ,  H03F2200/258 ,  H03F2200/432 ,  H03F2200/451 ,  H04B1/04

摘要： A switching amplifier provided, at a minimum, with: a first input transistor into which one of two input signals that operate in a complementary manner is input; a first cascode transistor cascade-connected between the first input transistor and a power supply; a second input transistor into which the other of the two input signals is input; and a second cascode transistor cascade-connected between the second input transistor and the first input transistor; the switching amplifier extracting an output signal, a connection point between the first input transistor and the second cascode transistor being used as an output terminal; wherein a first potential limiting circuit and a second potential limiting circuit for limiting the potential fluctuation range are respectively connected to the input terminal of the first cascode transistor and the input terminal of the second cascode transistor.

公开(公告)号：US20180248724A1

公开(公告)日：2018-08-30

申请号：US15755191

申请日：2015-09-01

申请人： NEC Corporation

发明人： Masaaki TANIO ,  Tomoyuki YAMASE ,  Shinichi HORI

IPC分类号： H04L27/12 ,  H04B1/04 ,  H03M3/00 ,  G06F7/544

CPC分类号： H04L27/12 ,  G06F7/544 ,  H03K19/21 ,  H03M3/39 ,  H03M3/50 ,  H03M7/3017 ,  H04B1/04 ,  H04B2001/0408

摘要： This ΔΣ modulator is a ΔΣ modulator using multiple integrators. The integrator: includes a plurality of stages of adder sequences, each of the adder sequences including a plurality of adders connected in series; performs feedback of a result of a second adder sequence as an input to a first adder sequence, the first adder sequence being a first stage of the plurality of stages, and the second adder sequence being a last stage of the plurality of stages; and processes inputs supplied to the plurality of adders of the first adder sequence and supplies it to the second adder sequence.

公开(公告)号：US20170331491A1

公开(公告)日：2017-11-16

申请号：US15528164

申请日：2015-11-18

申请人： NEC Corporation

发明人： Masaaki TANIO ,  Shinichi HORI

IPC分类号： H03M7/30 ,  H04B14/06 ,  H03M3/02 ,  G06F7/60 ,  H03L7/197 ,  H03L7/081 ,  H03F3/24 ,  H04L27/36

CPC分类号： H03M7/304 ,  G06F7/602 ,  H03F3/2171 ,  H03F3/24 ,  H03F3/245 ,  H03L7/0816 ,  H03L7/1976 ,  H03M3/02 ,  H03M3/37 ,  H03M3/502 ,  H03M7/3011 ,  H03M7/3015 ,  H04B14/062 ,  H04L27/36

摘要： The purpose of the present invention is to provide a high-power-efficiency and low-design-cost transmission device by implementing, with a constant clock, delta-sigma modulation maintaining a zero current switching property in an amplifier. This delta-sigma modulator comprises: a pulse phase signal generation unit for generating a pulse phase signal from a phase signal; a delta-sigma modulation unit for generating a pulse amplitude signal obtained by delta-sigma modulating an amplitude signal with a constant clock; a phase sorting unit for outputting a control signal on the basis of the phase signal; a delay switching unit for delaying the pulse amplitude signal on the basis of the control signal; and a mixing unit for outputting a pulse string obtained by multiplying together the delayed pulse amplitude signal and the pulse phase signal.

公开(公告)号：US20180262219A1

公开(公告)日：2018-09-13

申请号：US15760683

申请日：2016-09-23

申请人： NEC Corporation

发明人： Masaaki TANIO ,  Shinichi HORI ,  Tomoyuki YAMASE

IPC分类号： H04B1/02 ,  H03F3/19 ,  H03K5/133 ,  H03K5/135 ,  H03F3/21 ,  H04L27/20

CPC分类号： H04B1/02 ,  H03F3/19 ,  H03F3/211 ,  H03F3/2175 ,  H03F3/245 ,  H03F2200/171 ,  H03F2200/331 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2203/21106 ,  H03F2203/21142 ,  H03F2203/21157 ,  H03K5/133 ,  H03K5/135 ,  H03K2005/00019 ,  H03K2005/00234 ,  H04L27/00 ,  H04L27/20 ,  H04M1/6008

摘要： In a digital transmitter, a digital RF signal generation unit executes digital modulation on I and Q signals to convert the I and Q signal into first and second digital RF signals , respectively, with a bit rate which is twice a carrier frequency. A retiming unit delays the first digital RF signal according to a clock signal with a frequency which is 4n times (n is an integer) the carrier frequency to output the delayed first digital RF signal and delays the phase of the second digital RF signal by 90 degrees with respect to an output of the first digital RF signal to output the delayed second digital RF signal. First and second amplifiers amplify the first and second digital RF signals output by the retiming unit, respectively. A combiner combines the amplified first and second digital RF signals to generate one signal sequence.

公开(公告)号：US20180139802A1

公开(公告)日：2018-05-17

申请号：US15569802

申请日：2016-03-07

申请人： NEC Corporation

发明人： Shinichi HORI ,  Tomoyuki YAMASE

IPC分类号： H04W88/08 ,  H03M3/00 ,  H03L7/08 ,  H04Q11/00 ,  H04B10/40

CPC分类号： H04W88/085 ,  H03L7/08 ,  H03L7/0807 ,  H03M3/02 ,  H03M3/30 ,  H03M3/40 ,  H03M3/458 ,  H03M3/50 ,  H04B1/40 ,  H04B10/25752 ,  H04B10/40 ,  H04B2210/006 ,  H04L27/36 ,  H04Q11/0067 ,  H04Q11/0071

摘要： Provided are a wireless access system provided with a remote unit capable of handling a high-frequency region without being made complicated, and a control method for the same. A wireless access system according to the present invention is provided with: a center unit (1); and a remote unit (3) that converts a baseband signal generated by the center unit (1) into a high-frequency signal and emits the high-frequency signal from an antenna (12). The center unit (1) includes a 1-bit modulator (5) that converts the baseband signal into a 1-bit signal on the basis of a generated clock signal and outputs the 1-bit signal. The remote unit (3) includes: a local generation unit (10) that extracts the clock signal from the 1-bit signal output from the center unit (1), and generates a local signal using the extracted clock signal as a reference signal; a filter (13) that extracts a desired band component from the 1-bit signal; and an up-converter (14) that converts, using the local signal, an output signal of the filter into a high-frequency signal.

公开(公告)号：US20170310338A1

公开(公告)日：2017-10-26

申请号：US15513266

申请日：2015-09-17

申请人： NEC Corporation

发明人： Shinichi HORI

IPC分类号： H03M3/00 ,  H03F3/217 ,  H03M9/00 ,  H04L27/36

CPC分类号： H03M3/39 ,  H03F3/217 ,  H03F3/2175 ,  H03F3/24 ,  H03F2200/171 ,  H03F2200/331 ,  H03M3/456 ,  H03M3/47 ,  H03M9/00 ,  H04L27/36

摘要： This invention enables to efficiently improve the signal-to-noise power ratio of a delta-sigma modulator without increasing the operating frequency. A digital modulation device 40 includes: a setting unit 41 that sets mutually different default values for N delta-sigma modulation units 42-1 to 42-N; N delta-sigma modulation units 42-1 to 42-N that input signals for each clock cycle indicated in a first clock signal and then perform delta-sigma modulation on the input signals to output modulated signals including noise signals having values that change in accordance with default values; and a serial output unit 43 that inputs, in order, the modulated signals output by the delta-sigma modulation units 42-1 to 42-N for each clock cycle indicated in a second clock signal, the second clock signal having a clock cycle that is 1/N of the clock cycle of the first clock signal, and then serializes and outputs the modulated signals.