公开(公告)号：DE19949586A1

公开(公告)日：2000-04-20

申请号：DE19949586

申请日：1999-10-14

Applicant: ADVANTEST CORP

Inventor： KURIHARA TOSHIAKI ,  ARAI MICHIAKI

IPC: H04L27/18 ,  H04L27/00 ,  H04L27/22 ,  H04L27/233

Abstract: For each of several candidate values for an initial phase a coefficient of correlation is calculated between a signal whose clock pulse delay has been estimated and compensated and an ideal signal created by the signal. The system includes a ZF signal converter (100), a baseband converter (200), a frequency error coarse estimator-cum-compensator (300), an initial phase and frequency error estimator-cum-compensator (400) and a precise parameter estimator (500).

公开(公告)号：DE112004002262T5

公开(公告)日：2006-10-26

申请号：DE112004002262

申请日：2004-11-18

Applicant: ADVANTEST CORP

Inventor： ARAI MICHIAKI

IPC: G01R23/173 ,  G01R19/25 ,  G01R29/08 ,  H03H17/00

Abstract: A QP detection unit includes digital circuit elements. There is provided a digital QP detector which detects an electric power signal Vi, which is an input signal, and outputs a detection signal Vo. The digital QP detector includes a register which records input digital data, a first multiplier which multiplies the digital data recorded in the register by a first coefficient, a second multiplier which multiplies the digital data recorded in the register by a second coefficient, an adder which adds the electric power signal Vi and the output from the first multiplier to each other, a comparator which compares the level of the electric power signal Vi and the level of the detection signal Vo, and a first switch which switches the digital data to be fed to the register between the output from the adder (Vi>Vo) and the output from the second multiplier (Vi

公开(公告)号：DE19849524A1

公开(公告)日：1999-05-06

申请号：DE19849524

申请日：1998-10-27

Applicant: ADVANTEST CORP

Inventor： ARAI MICHIAKI ,  KOSUGE TAKASHI

IPC: G01R23/173 ,  G01R23/16 ,  G01R29/00

Abstract: The output signal of a frequency converter (13) for selecting the frequency is fed to an A/D converter (31). If a converter overflow condition results a level adjusting device adjusts the first stage of the spectral analyzer to prevent this. The output signal level of the frequency converter is adjusted so that the input signal level to the A/D converter always lies in the normal operating level range of the A/D converter.

公开(公告)号：DE19949586B4

公开(公告)日：2005-09-15

申请号：DE19949586

申请日：1999-10-14

Applicant: ADVANTEST CORP

Inventor： KURIHARA TOSHIAKI ,  ARAI MICHIAKI

IPC: H04L27/18 ,  H04L27/00 ,  H04L27/22 ,  H04L27/233

Abstract: The offset QPSK modulation analytic system capable of estimating the initial phase of an offset QPSK modulated signal is disclosed. For each of a plurality of candidate values for the initial phase, the correlation coefficient between a signal whose clock delay has been estimated and compensated and an ideal signal generated based on the signal is computed, and the candidate value having the maximum value of the computed correlation coefficient is estimated as the optimum initial phase.

公开(公告)号：DE10392236T5

公开(公告)日：2005-03-03

申请号：DE10392236

申请日：2003-01-30

Applicant: ADVANTEST CORP

Inventor： ARAI MICHIAKI ,  NISHI MASANOBU

IPC: H03M1/18

公开(公告)号：JPH075213A

公开(公告)日：1995-01-10

申请号：JP17269493

申请日：1993-06-18

Applicant: ADVANTEST CORP

Inventor： ARAI MICHIAKI

IPC: G01R23/16

Abstract: PURPOSE:To achieve a frequency correction and a phase correction of a gain automatically at a high accuracy by arranging a correction value data to store a correction factor, a correction computing section or the like to perform a computation for correcting a measured value. CONSTITUTION:External input signals of channels A and B are converted into digital with analog sections 12 and 22 and then, to a gain at each frequency and a phase data with fast Fourier transform processing sections 13 and 23. The resulting outputs undergo an arithmetic processing for correction with a correction computing section 16 by taking out a correction data corresponding to respective frequencies from a correction value table 27 where correction factors are stored and then, a spectrum signal is outputted. In a dual channel operation, a transfer function is determined by calculation of (spectrum of channel A)/spectrum of channel B. Thus, spectrum signal outputs of the two channels A and B are applied to an amplitude ratio phase difference computing section 17 to compute the transfer function between the channels A and B and a signal is outputted externally.

公开(公告)号：JP2000124961A

公开(公告)日：2000-04-28

申请号：JP30786798

申请日：1998-10-14

Applicant: ADVANTEST CORP

Inventor： KURIHARA TOSHIAKI ,  ARAI MICHIAKI

IPC: H04L27/18 ,  H04L27/00 ,  H04L27/22 ,  H04L27/233

Abstract: PROBLEM TO BE SOLVED: To provide an offset QPSK modulation analyzing system capable of estimating an initial phase and clock delay contained in a received signal using an offset QPSK modulating system. SOLUTION: Phase correcting parts 4301-430n perform phase corrections respectively corresponding to (n) pieces of candidate values ϕ1-ϕn of the initial phase, and clock delay correcting parts 4301-430n estimate the clock delay while using a QPSK signal returning the offset component of quadrature or in-phase component of this phase corrected signal original. A correlation coefficient calculating part 442 calculates the coefficient of mutual correlation between a real clock delay corrected signal and a correspondent ideal signal, and an optimum initial phase discriminating part 450 extracts the initial phase of the maximum mutual correlation coefficient as one closest to a true value.

公开(公告)号：JP2005303671A

公开(公告)日：2005-10-27

申请号：JP2004116926

申请日：2004-04-12

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： ARAI MICHIAKI

IPC: H04J1/02 ,  H04J11/00

Abstract: PROBLEM TO BE SOLVED: To reduce the labor of measuring an adjacent channel leakage power ratio of a plurality of carrier signals. SOLUTION: This signal measuring instrument is provided with a signal power recording part 52a for receiving a multicarrier signal having a plurality of frequency (f1 COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：减少测量多个载波信号的相邻信道泄漏功率比的劳动。 解决方案：该信号测量仪器设置有用于接收具有多个频率（f1

公开(公告)号：JPH1010168A

公开(公告)日：1998-01-16

申请号：JP18112896

申请日：1996-06-21

Applicant: ADVANTEST CORP

Inventor： ARAI MICHIAKI

IPC: G01R23/173 ,  H04B17/00 ,  H04B17/309

Abstract: PROBLEM TO BE SOLVED: To obtain a spectrum analyzer for measuring TDMA wave having a wide frequency band and a robust gated sweep function by passing a trigger signal or a gate signal through a circuit for passing or delaying the signal by a specified time and the delivering the signal to a ramp voltage generator through a switch. SOLUTION: A down converter 30 comprises a mixer 31, a local oscillator 33 for trigger, and a BPF 32. An arbitrary burst wave taken out from the BPF 32 is fed to a trigger signal generation circuit 28 in order to generate a trigger at the edge of the burst wave. A variable delay circuit 36 can switch a path for passing a signal as it is and a path for delaying a signal by integer times of the burst width. A trigger signal or a gate signal p2 is fed to a ramp voltage generator 21 through a switch S1 for switching a continuous wave measurement and a TDMA (time division multiple path) wave measurement. This arrangement realizes a robust spectrum analyzer in which only 1 frequency can be selected among a wide band frequencies and can be processed at high sensitivity.

公开(公告)号：JP2008109476A

公开(公告)日：2008-05-08

申请号：JP2006291445

申请日：2006-10-26

Applicant: Advantest Corp ,  株式会社アドバンテスト

Inventor： ARAI MICHIAKI

IPC: H04L27/00 ,  G01R29/00

Abstract: PROBLEM TO BE SOLVED: To reduce the labor of a modulation analysis of a signal to be measured.
SOLUTION: This signal measuring device 30 for measuring an output signal output by an object 2 to be measured to which an input signal generated based on an ideal symbol point includes a symbol point measuring part 34 for measuring a measuring symbol point being a symbol point of the output signal, and an EVM (error vector magnitude) measuring part 38 for measuring the accuracy of the output signal on the basis of the ideal symbol point corresponding to an ideal value of the output signal and the measuring symbol point, wherein the ideal symbol point is known before the output signal is output.
COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 要解决的问题：减少要测量的信号的调制分析的劳动。 解决方案：用于测量由基于理想符号点产生的输入信号的待测对象2输出的输出信号的信号测量装置30包括用于测量测量符号点的符号点测量部分34 输出信号的符号点和用于根据对应于输出信号和测量符号点的理想值的理想符号点来测量输出信号的精度的EVM（误差矢量幅度）测量部分38，其中 在输出信号输出之前，理想的符号点是已知的。 版权所有（C）2008，JPO＆INPIT