公开(公告)号：US6107963A

公开(公告)日：2000-08-22

申请号：US442637

申请日：1999-11-18

申请人： Shinichiro Ohmi ,  Hiroshi Oue ,  Hideki Nakahara

发明人： Shinichiro Ohmi ,  Hiroshi Oue ,  Hideki Nakahara

IPC分类号： H01Q3/26 ,  G01S3/16

CPC分类号： H01Q3/2605

摘要： An adaptive antenna includes a buffer for storing sample data obtained by sampling a receive signal, an information storage part for storing a plurality of sets of coefficients, an evaluation part for calculating an evaluation value of the result obtained by the coefficient and the sample data, a selection part for selecting two or more sets of coefficients in order of decreasing evaluation, an exchanging part for exchanging a part of coefficients between the selected sets of coefficients to generate a new set of coefficients, a changing part for changing a part of coefficients of the selected sets with random numbers to generate a new sets of coefficients, a reproduction part for reproducing the selected sets of coefficients as they are, and a determination part for outputting the result obtained by the set of coefficients with the highest evaluation value after the information storage part, the evaluation part, the selection part, the exchanging part, the changing part, and the reproduction part repeats respective operation once or more.

摘要翻译： 自适应天线包括用于存储通过对接收信号进行采样得到的采样数据的缓冲器，用于存储多组系数的信息存储部分，用于计算由系数和采样数据获得的结果的评估值的评估部分， 选择部分，用于按照递减评估的顺序选择两组或多组系数;交换部分，用于交换所选择的系数集合中的一部分系数以产生一组新的系数;改变部分，用于改变部分系数 所选择的具有随机数的集合以生成新的系数集合，用于再现所选择的系数集合的再现部分，以及确定部分，用于输出在信息之后具有最高评估值的系数集合获得的结果 存储部分，评估部分，选择部分，交换部分，变化部分和可重复的部分 制作部分重复相应的操作一次或多次。

公开(公告)号：US08170162B2

公开(公告)日：2012-05-01

申请号：US13086659

申请日：2011-04-14

申请人： Hideki Nakahara ,  Yoshinobu Matsumura ,  Mikihiro Ouchi ,  Tomohiko Taniguchi

发明人： Hideki Nakahara ,  Yoshinobu Matsumura ,  Mikihiro Ouchi ,  Tomohiko Taniguchi

IPC分类号： H04B7/10

CPC分类号： H04L25/03159 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0232 ,  H04L25/03821 ,  H04L27/2649 ,  H04L2025/03414

摘要： An inter-carrier interface removal device can improve estimation accuracy of inter-carrier interference caused by Doppler shift in a received multi-carrier signal moving at a high speed, and a reception characteristic of the multi-carrier signal after removing the inter-carrier interference. The inter-carrier interference removal device includes a channel estimation unit estimating a channel frequency characteristic according to a carrier signal, an equalization unit equalizing the carrier signal with the channel frequency characteristic and outputs tentative carrier data, a reliability value calculation unit calculating a reliability value according to the channel frequency characteristic, a weighting unit weighting the tentative carrier data with the reliability value, an ICI component estimation unit estimating an ICI component according to the weighted tentative carrier data and the estimated channel frequency characteristic, and an ICI removal calculation unit removing the ICI component from the carrier signal.

摘要翻译： 载波间接口去除装置可以提高在高速移动的接收多载波信号中由多普勒频移引起的载波间干扰的估计精度，以及去除载波间干扰后的多载波信号的接收特性 。 载波间干扰去除装置包括：信道估计单元，根据载波信号估计信道频率特性;均衡单元，使载波信号与信道频率特性相等，并输出暂定载波数据;可靠性值计算单元，计算可靠性值 根据信道频率特性，对具有可靠性值的暂定载波数据加权的加权单元，ICI分量估计单元，根据加权的假载波数据和估计的信道频率特性来估计ICI分量，以及ICI去除计算单元去除 ICI组件从载波信号。

公开(公告)号：US08170130B2

公开(公告)日：2012-05-01

申请号：US11886072

申请日：2006-03-24

申请人： Hideki Nakahara ,  Hitoshi Takai ,  Koichiro Tanaka

发明人： Hideki Nakahara ,  Hitoshi Takai ,  Koichiro Tanaka

IPC分类号： H04B7/02

CPC分类号： H04L27/206 ,  H04B7/0678

摘要： A transmission device includes a differential encoding section for differentially encoding transmission data, a first waveform generation section, a second waveform generation section, and two transmission antennas. A reception device includes a reception antenna, a delay detection section, and a data determination section for low-pass filtering a delay detection signal. The reception device receives modulated signals modulated by using two waveforms having low correlations with each other. Thus, regardless of the presence or absence of delay dispersion in a propagation path and even in a high-speed fading in which the propagation path varies at high speed, a transmission diversity effect can be achieved, thereby making it possible to improve transmission characteristics.

摘要翻译： 传输装置包括差分编码传输数据的差分编码部分，第一波形产生部分，第二波形发生部分和两个发射天线。 接收装置包括接收天线，延迟检测部分和用于对延迟检测信号进行低通滤波的数据确定部分。 接收装置接收通过使用彼此具有低相关性的两个波形调制的调制信号。 因此，无论传播路径中是否存在延迟色散，并且即使在传播路径高速变化的高速衰落中也能够实现发送分集效果，能够提高传输特性。

公开(公告)号：US20080175221A1

公开(公告)日：2008-07-24

申请号：US10569491

申请日：2005-09-16

申请人： Hideki Nakahara ,  Hitoshi Takai ,  Hidetoshi Yamasaki ,  Kenji Miyanaga ,  Koichiro Tanaka

发明人： Hideki Nakahara ,  Hitoshi Takai ,  Hidetoshi Yamasaki ,  Kenji Miyanaga ,  Koichiro Tanaka

IPC分类号： H04J3/06

CPC分类号： H04L1/1887 ,  H04B7/022 ,  H04B7/0667 ,  H04B7/0676 ,  H04B7/15592 ,  H04W84/042 ,  H04W84/047

摘要： The present invention provides a wireless transmission system in which it is possible to exert a maximum path diversity effect even if the maximum number of effective branches is limited to a small number. A transmission timing control section (23) determines a transmission start timing to be a timing obtained by delaying a reference timing by a predetermined delay amount. A modulation section (21) modulates a signal by a modulation scheme such that an anti-multipath property is exerted when the signal is demodulated on a receiver side, and transmits the modulated signal at the transmission start timing. In a receiving station (12), a demodulation section (33) demodulates the receive signal to obtain receive data. The predetermined delay amount is such that signals are received at the receiving station (12) at a plurality of signal-receiving timings, and the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches, a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution and is less than or equal to a predetermined maximum delay.

摘要翻译： 本发明提供一种无线传输系统，其中即使最大数量的有效分支被限制为少数，也可以施加最大路径分集效应。 发送定时控制部（23）将发送开始定时确定为通过将基准定时延迟预定延迟量而获得的定时。 调制部（21）通过调制方式对信号进行调制，使得当在接收机侧解调信号时施加抗多径特性，并在发送开始定时发送调制信号。 在接收站（12）中，解调部（33）对接收信号进行解调，得到接收数据。 预定延迟量使得在接收站（12）处以多个信号接收定时接收信号，并且信号接收定时的数量小于或等于预定的最大有效分支数，差 在信号接收定时之间大于或等于预定的延迟分辨率并且小于或等于预定的最大延迟。

公开(公告)号：US07277501B2

公开(公告)日：2007-10-02

申请号：US10640655

申请日：2003-08-14

申请人： Kenichi Mori ,  Yoshio Urabe ,  Koichiro Tanaka ,  Hideki Nakahara ,  Hitoshi Takai

发明人： Kenichi Mori ,  Yoshio Urabe ,  Koichiro Tanaka ,  Hideki Nakahara ,  Hitoshi Takai

IPC分类号： H03D3/00 ,  H03K9/06

CPC分类号： H04L27/2331 ,  H04L5/06

摘要： A data receiving device is provided enabling a reduction in the time required for extracting a partial band signal, and capable of being easily made in a simple structure as an LSI device without requiring a plurality of analog circuits having the same characteristics. The data receiving device includes: a first sampler for sampling an in-phase signal I(t) at every predetermined sampling period and outputting the sampled in-phase signal; a second sampler for sampling a quadrature signal at every predetermined sampling period and outputting the sampled quadrature signal; a partial band extracting section structured by a complex filter for extracting partial band signals IBr, QBr from frequency components included in the sampled in-phase signal and the sampled quadrature signal; and first and second delay detection operating sections for performing a delay detecting process based on the partial band signals and outputting detection signals.

摘要翻译： 提供一种数据接收装置，其能够减少提取部分频带信号所需的时间，并且能够容易地以简单的结构作为LSI装置，而不需要具有相同特性的多个模拟电路。 数据接收装置包括：第一采样器，用于在每个预定采样周期对同相信号I（t）进行采样，并输出采样的同相信号; 第二取样器，用于在每个预定采样周期对正交信号进行采样，并输出采样的正交信号; 由复数滤波器构成的部分频带提取部分，用于从包括在采样的同相信号中的频率分量和采样的正交信号中提取部分频带信号IB，QB＆lt; SUB＆lt; ; 以及第一和第二延迟检测操作部分，用于基于部分频带信号执行延迟检测处理并输出检测信号。

公开(公告)号：US06618352B1

公开(公告)日：2003-09-09

申请号：US09317961

申请日：1999-05-25

申请人： Naganori Shirakata ,  Yasuo Harada ,  Hiroshi Hayashino ,  Koichiro Tanaka ,  Hideki Nakahara

发明人： Naganori Shirakata ,  Yasuo Harada ,  Hiroshi Hayashino ,  Koichiro Tanaka ,  Hideki Nakahara

IPC分类号： H04J1100

CPC分类号： H04L27/2657 ,  H04L27/2679

摘要： An input of an OFDM signal containing known pilot carriers among given subcarriers is separated into subcarriers through Fourier transform in a fast Fourier transform unit. A data carrier phase error estimating unit obtains an amount of phase correction of each subcarrier on the basis of the pilot carriers in the separated subcarriers. A data carrier phase correcting unit corrects the phase of the separated subcarrier signal on the basis of the amount of phase correction. Thus, the phase errors of the subcarriers can be corrected and the OFDM symbols can be demodulated even if a frequency error and a timing error are occurring between the transmitter and receiver.

摘要翻译： 在给定子载波中包含已知导频载波的OFDM信号的输入通过傅里叶变换在快速傅立叶变换单元中被分离成副载波。 数据载波相位误差估计单元基于分离的子载波中的导频载波来获得每个子载波的相位校正量。 数据载波相位校正单元根据相位校正量校正分离的副载波信号的相位。 因此，即使在发射机和接收机之间出现频率误差和定时误差，也可以校正子载波的相位误差并且可以解调OFDM符号。

公开(公告)号：US07899139B2

公开(公告)日：2011-03-01

申请号：US12003933

申请日：2008-01-03

申请人： Hideki Nakahara ,  Koichiro Tanaka ,  Kenichi Mori ,  Yoshio Urabe ,  Hitoshi Takai

发明人： Hideki Nakahara ,  Koichiro Tanaka ,  Kenichi Mori ,  Yoshio Urabe ,  Hitoshi Takai

IPC分类号： H04L27/06

CPC分类号： H04L7/041 ,  H04L7/0334 ,  H04L7/046 ,  H04L27/2332 ,  H04L2027/0036 ,  H04L2027/0067 ,  H04L2027/0095

摘要： A detected signal 111 contains a preamble portion which includes symbol alternations, followed by a unique word portion, and a data portion. Each time a symbol alternation is detected, a correction value calculation section 102 averages the phase shift in the detected signal 111 for a predetermined length, thereby calculating a correction value 115. The correction value determination section 103 stores a plurality of correction values 115 in a chronological order. When the unique word portion is detected, the correction value determination section 103 retains, as an effective correction value 118, a correction value which is arrived at by going back a predetermined number of correction values among the stored correction values. A phase rotation section 104 corrects the phase of the detected signal 111 by using an effective correction value 118 calculated by the correction value determination section 103.

摘要翻译： 检测信号111包含前导码部分，其包括符号替换，随后是唯一字部分和数据部分。 每当检测到符号交替时，校正值计算部分102将检测信号111中的相移平均预定长度，从而计算校正值115.校正值确定部分103将多个校正值115存储在 按时间顺序排列。 当检测到唯一字部分时，校正值确定部分103将存储的校正值中的预定数量的校正值返回到达到的校正值作为有效校正值118。 相位旋转部104通过使用由校正值确定部103计算出的有效校正值118来校正检测信号111的相位。

公开(公告)号：US07843972B2

公开(公告)日：2010-11-30

申请号：US11312344

申请日：2005-12-21

申请人： Hideki Nakahara ,  Koichiro Tanaka ,  Naganori Shirakata ,  Tomohiro Kimura ,  Yasuo Harada

发明人： Hideki Nakahara ,  Koichiro Tanaka ,  Naganori Shirakata ,  Tomohiro Kimura ,  Yasuo Harada

IPC分类号： H04J3/06 ,  H04J11/00 ,  H04J3/16

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/006 ,  H04L5/0085 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2675

摘要： In an OFDM transmission method, in order to compensate any frequency response variation time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculator calculates a frequency response of the transmission path for a second pilot symbol. Thereafter, a compensation vector calculator calculates compensation vectors from the frequency responses of the transmission path for both the first and second pilot symbols by linear approximation. A frequency response compensator compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.

摘要翻译： 在OFDM传输方法中，为了补偿由于传输路径中的任何失真而导致的任何频率响应变化，与时间的流逝，频率漂移和相移失调，并且为了提高解调特性， 在接收OFDM信号的接收机中的PS检测器检测导频符号。 PS1 TPFR计算器计算第一导频符号的传输路径的频率响应，而PS2 TPFR计算器计算用于第二导频符号的传输路径的频率响应。 此后，补偿向量计算器通过线性近似来计算来自第一和第二导频符号的传输路径的频率响应的补偿向量。 频率响应补偿器基于所计算的补偿向量来补偿数据符号中子载波的频率响应变化。

公开(公告)号：US07756218B2

公开(公告)日：2010-07-13

申请号：US10569491

申请日：2005-09-16

申请人： Hideki Nakahara ,  Hitoshi Takai ,  Hidetoshi Yamasaki ,  Kenji Miyanaga ,  Koichiro Tanaka

发明人： Hideki Nakahara ,  Hitoshi Takai ,  Hidetoshi Yamasaki ,  Kenji Miyanaga ,  Koichiro Tanaka

IPC分类号： H04L27/00

CPC分类号： H04L1/1887 ,  H04B7/022 ,  H04B7/0667 ,  H04B7/0676 ,  H04B7/15592 ,  H04W84/042 ,  H04W84/047

摘要： A wireless transmission system exerts a maximum path diversity effect even if the maximum number of effective branches is limited to a small number. A transmission timing control section determines a transmission start timing to be a timing obtained by delaying a reference timing by a predetermined delay amount. A modulation section modulates a signal by a modulation scheme such that an anti-multipath property is exerted when the signal is demodulated on a receiver side, and transmits the modulated signal at the transmission start timing. In a receiving station, a demodulation section demodulates the receive signal to obtain receive data. The predetermined delay amount is such that signals are received at the receiving station at a plurality of signal-receiving timings, and the number of signal-receiving timings is less than or equal to a predetermined maximum number of effective branches, a difference between the signal-receiving timings is greater than or equal to a predetermined delay resolution and is less than or equal to a predetermined maximum delay.

摘要翻译： 无线传输系统即使最大数量的有效分支被限制为少数，也施加最大路径分集效应。 发送定时控制部分将发送开始定时确定为通过将基准定时延迟预定延迟量而获得的定时。 调制部通过调制方式对信号进行调制，使得当在接收机侧解调信号时施加反多径特性，并在发送开始定时发送调制信号。 在接收站中，解调部分解调接收信号以获得接收数据。 预定延迟量使得在多个信号接收定时在接收站处接收信号，并且信号接收定时的数量小于或等于预定的最大有效分支数，信号之间的差 接收定时大于或等于预定的延迟分辨率，并且小于或等于预定的最大延迟。

公开(公告)号：US20080212706A1

公开(公告)日：2008-09-04

申请号：US11886072

申请日：2006-03-24

申请人： Hideki Nakahara ,  Hitoshi Takai ,  Koichiro Tanaka

发明人： Hideki Nakahara ,  Hitoshi Takai ,  Koichiro Tanaka

IPC分类号： H04B7/06

CPC分类号： H04L27/206 ,  H04B7/0678

摘要： A transmission device (100) includes a differential encoding section (101) for differentially encoding transmission data, a first waveform generation section (102), a second waveform generation section (103), and two transmission antennas (109 and 110). A reception device (140) includes a reception antenna (141), a delay detection section (144), and a data determination section (145) for low-pass filtering a delay detection signal. The reception device (140) receives modulated signals modulated by using two wave forms having low correlations with each other. Thus, regardless of the presence or absence of delay dispersion in a propagation path and even in a high-speed fading in which the propagation path varies at high speed, a transmission diversity effect can be achieved, thereby making it possible to improve transmission characteristics.

摘要翻译： 发送装置（100）包括用于对发送数据进行差分编码的差分编码部（101），第一波形生成部（102），第二波形生成部（103）和两个发送天线（109,110）。 接收装置（140）包括接收天线（141），延迟检测部（144）和用于对延迟检测信号进行低通滤波的数据判定部（145）。 接收装置（140）接收通过使用彼此具有低相关性的两个波形调制的调制信号。 因此，无论传播路径中是否存在延迟色散，并且即使在传播路径高速变化的高速衰落中也能够实现发送分集效果，能够提高传输特性。