公开(公告)号：EP0280161B1

公开(公告)日：1996-05-01

申请号：EP88102241.2

申请日：1988-02-16

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H01J1/05 ,  H04J4/00

CPC分类号： H04J1/05 ,  H03H17/0213

公开(公告)号：EP0802644B1

公开(公告)日：2004-06-30

申请号：EP97106084.3

申请日：1997-04-14

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H04J4/00

CPC分类号： H04J4/005

公开(公告)号：EP0802644A2

公开(公告)日：1997-10-22

申请号：EP97106084.3

申请日：1997-04-14

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H04J4/00

CPC分类号： H04J4/005

摘要： A variable-bandwidth frequency-division multiplex communication system which needs no interpolation circuits, but uses switch element of simple structure. The system includes a signal combining circuit which has N A/D converters associated respectively with independent information signals to be transmitted, a complex local oscillator for generating complex signals each having a frequency kΔf ( 1 ≤ k≤ N-1 ), Δf being the channel frequency interval, N complex multipliers for multiplying the outputs of the A/D converters by the respective complex signals, and producing N output signals, a circuit for effecting an inverse Fourier transform of N points, an N × N switch circuit connected between the outputs of the complex multipliers and input terminals of the inverse Fourier transform circuit, N digital subfilters connected respectively to the outputs of the inverse Fourier transform circuit, N delay units connected respectively to outputs of the digital subfilters, and an adder for adding output signals from the delay units and outputting a sum signal.

摘要翻译： 一种不需要插值电路的可变带宽分频复用通信系统，但采用结构简单的开关元件。 该系统包括一个信号组合电路，该信号组合电路具有分别与待传输的独立信息信号相关联的NA / D转换器，一个复数本地振荡器，用于产生每个具有频率k DELTA f（1≤k≤N-1）的复数信号，DELTA f 作为通道频率间隔的N个复数乘法器，用于将各个复数信号乘以A / D转换器的输出并产生N个输出信号的N个复数乘法器，用于进行N个点的逆傅里叶变换的电路，连接的N×N个开关电路 在傅立叶逆变换电路的复数乘法器和输入端的输出之间，分别连接到逆傅里叶变换电路的输出的N个数字子滤波器，分别连接到数字子滤波器的输出的N个延迟单元，以及用于将输出 来自延迟单元的信号并输出​​和信号。

公开(公告)号：EP0310939A3

公开(公告)日：1990-04-04

申请号：EP88116056.8

申请日：1988-09-29

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： G01S5/14

CPC分类号： G01S19/00 ,  G01S5/06 ,  H04B7/216

摘要： A satellite-based vehicle communication/position determination system constituted by N (N ≧ 3) geostationary satellites, a plurality of vehicle stations for performing radio-wave exchange with the satellites using a low-directivity antenna, and a base station having high-directivity antennas for independently performing radio-wave exchange with the N geostationary satellites is disclosed. The base station has a communication FDM receiver, N chirp signal receivers (4) for receiving and pulse compressing chirp signals from a vehicle station, which are obtained via the N geostationary satellites, and a circuit (5) for determining the position of the vehicle station based on time differences of compressed pulses from the chirp signal receivers. Each vehicle station has a communication FDM receiver, a transmitter, a chirp signal generator, and a switching control circuit for controlling to selectively output a transmitting signal or the chirp signal.

公开(公告)号：EP0310939B1

公开(公告)日：1993-12-08

申请号：EP88116056.8

申请日：1988-09-29

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： G01S5/14

CPC分类号： G01S19/00 ,  G01S5/06 ,  H04B7/216

公开(公告)号：EP0280161A3

公开(公告)日：1990-12-12

申请号：EP88102241.2

申请日：1988-02-16

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H01J1/05 ,  H04J4/00

CPC分类号： H04J1/05 ,  H03H17/0213

摘要： An N-channel FDM signal is converted into complex signals of baseband frequencies (1-6) spaced at intervals equal to frequency Δf. The complex baseband signals are converted first into digital samples (7-9)having a frequency NΔf and then into N parallel digital signals (11). A plurality of first FIR subfilters (17-1 through 17-N) respectively perform filtering on each of the parallel digital signals at frequency Δf to produce a first series of filtered digital signals from each of the first FIR subfilters, and (m - 1) groups of second FIR subfilters respectively perform filtering on each of the parallel digital signals at frequency Δf to produce a second series of filtered digital samples from each of the second FIR subfilters at timing displaced with respect to the first series by a/mΔf, where is an integer ranging from unity to (m - 1) and m is an integer equal to or greater than 2. Outputs of the first FIR subfilters are combined with outputs of the second FIR subfilters to produce N summation outputs at frequency mΔf. An N-point Fast Fourier Transform processor (14) performs fast Fourier transform on the N summation outputs at frequency mΔf to derive digital channels. Because of the oversampling at frequency mΔf, each of the digital channels has a frequency response which can be made flat over the bandwidth Δf.

公开(公告)号：EP0310939A2

公开(公告)日：1989-04-12

申请号：EP88116056.8

申请日：1988-09-29

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： G01S5/14

CPC分类号： G01S19/00 ,  G01S5/06 ,  H04B7/216

摘要： A satellite-based vehicle communication/position determination system constituted by N (N ≧ 3) geostationary satellites, a plurality of vehicle stations for performing radio-wave exchange with the satellites using a low-directivity antenna, and a base station having high-directivity antennas for independently performing radio-wave exchange with the N geostationary satellites is disclosed. The base station has a communication FDM receiver, N chirp signal receivers (4) for receiving and pulse compressing chirp signals from a vehicle station, which are obtained via the N geostationary satellites, and a circuit (5) for determining the position of the vehicle station based on time differences of compressed pulses from the chirp signal receivers. Each vehicle station has a communication FDM receiver, a transmitter, a chirp signal generator, and a switching control circuit for controlling to selectively output a transmitting signal or the chirp signal.

摘要翻译： 由N个构成的基于卫星的车辆通信/位置确定系统（N> / = 3）对地静止卫星，车辆站，用于执行与使用低方向性天线的卫星无线电波交换的多个，并且基站具有高 为与N个对地静止卫星unabhängig执行无线电波交换-directivity天线的游离缺失盘。 基站具有的通信FDM接收机，N-线性调频脉冲信号的接收器（4），用于从车辆站，其经由所述N个对地静止卫星获得的接收和脉冲压缩啁啾信号，以及用于确定性采矿的电路（5）的车辆的位置 基于从线性调频脉冲信号的接收器的压缩脉冲的时间差站。 每个车辆站具有通信FDM接收机，发射机，线性调频脉冲信号发生器，以及用于控制输出，以选择性地发送信号或线性调频脉冲信号的开关控制电路。

公开(公告)号：EP0802644A3

公开(公告)日：2000-07-05

申请号：EP97106084.3

申请日：1997-04-14

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H04J4/00

CPC分类号： H04J4/005

摘要： A variable-bandwidth frequency-division multiplex communication system which needs no interpolation circuits, but uses switch element of simple structure. The system includes a signal combining circuit which has N A/D converters associated respectively with independent information signals to be transmitted, a complex local oscillator for generating complex signals each having a frequency kΔf (1 ≤ k≤ N-1), Δf being the channel frequency interval, N complex multipliers for multiplying the outputs of the A/D converters by the respective complex signals, and producing N output signals, a circuit for effecting an inverse Fourier transform of N points, an N × N switch circuit connected between the outputs of the complex multipliers and input terminals of the inverse Fourier transform circuit, N digital subfilters connected respectively to the outputs of the inverse Fourier transform circuit, N delay units connected respectively to outputs of the digital subfilters, and an adder for adding output signals from the delay units and outputting a sum signal.

公开(公告)号：EP0817370A1

公开(公告)日：1998-01-07

申请号：EP97110849.3

申请日：1997-07-01

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H03D7/16 ,  H04B1/40

CPC分类号： H03D7/163 ,  H04B1/405

摘要： A radio communication device includes a transmission carrier generating circuit (42), a reception intermediate-frequency local signal generating circuit (43), a transmission radio-frequency local signal generating circuit (44) and a reception radio-frequency local signal generating circuit (45), each of which is in the form of a frequency synthesizer. The radio communication device further includes a channel connection signal control circuit (15) which cooperatively controls the transmission carrier generating circuit and the transmission radio-frequency local signal generating circuit and cooperatively controls the reception intermediate-frequency local signal generating circuit and the reception radio-frequency local signal generating circuit.

摘要翻译： 无线电通信装置包括传输载波发生电路（42），接收中频本地信号发生电路（43），发射射频本地信号发生电路（44）和接收射频本地信号发生电路 45），其每一个都是频率合成器的形式。 该无线电通信装置还包括一个信道连接信号控制电路（15），协同控制传输载波发生电路和传输射频本地信号发生电路，并协同控制接收中频本地信号发生电路和接收无线电 - 频率本地信号发生电路。

公开(公告)号：EP0304890A3

公开(公告)日：1990-10-10

申请号：EP88113790.5

申请日：1988-08-24

申请人： NEC CORPORATION

发明人： Ichiyoshi, Osamu

IPC分类号： H04B7/185

CPC分类号： H04B7/216

摘要： For use in a satellite communication system which carries out communication through a satellite by the use of an up-link frequency band and a down-link frequency band, each of the up-link and the down-link frequency bands has a plurality of frequency subbands spaced apart from one another with frequency gaps interposed between the frequency subbands. An earth station comprises a modulating arrangement (47) for modulating a selected one of the frequency subbands of the up-link frequency band by a first input signal into a subband transmission signal, a first transmitting arrangement (51) coupled to the modulating arrangement for transmitting the subband transmission signal through the selected one of the frequency subbands, a spread spectrum processing arrangement (50) for processing a second input signal into a spread spectrum transmission signal in the up-link frequency band, and a second transmitting arrangement (51) coupled to the spread spectrum processing arrangement for transmitting the spread spectrum transmission signal through the up-link frequency band.