公开(公告)号：US07619963B2

公开(公告)日：2009-11-17

申请号：US10865817

申请日：2004-06-14

申请人： Tetsushi Abe ,  Hirohito Suda ,  Shigeru Tomisato ,  Hiromasa Fujii ,  Takefumi Yamada

发明人： Tetsushi Abe ,  Hirohito Suda ,  Shigeru Tomisato ,  Hiromasa Fujii ,  Takefumi Yamada

IPC分类号： H04J11/00 ,  H04J1/00 ,  H04K1/10 ,  H04L27/28

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/006

摘要： 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 configured to determine a pilot and data arrangement format of the signal that is to be transmitted; power amplification rate determiner configured to determine a power amplification rate for the signal frame; data symbol generator configured to generate data symbol series to be transmitted based on the rate information and based on the power amplification rate; and transmission signal frame generator configured to generate the signal frame based on the generated data symbol series, on the number of pilot symbols, and based on the pilot & data arrangement format.

摘要翻译： OFDM信号帧发生器包括速率确定器，其被配置为基于接收信号质量的值来确定速率信息以生成要作为OFDM信号发送的信号帧。 所述信号帧发生器还包括导频和数据排列格式确定器，被配置为确定要发送的信号的导频和数据排列格式; 功率放大率确定器，被配置为确定所述信号帧的功率放大率; 数据符号发生器，其被配置为基于所述速率信息并基于所述功率放大率生成要发送的数据符号序列; 以及发送信号帧生成器，被配置为基于所生成的数据符号序列，关于导频符号的数量，并且基于导频和数据排列格式生成信号帧。

公开(公告)号：US07633924B2

公开(公告)日：2009-12-15

申请号：US10535859

申请日：2003-11-20

申请人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda ,  Tetsushi Abe ,  Takefumi Yamada

发明人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda ,  Tetsushi Abe ,  Takefumi Yamada

IPC分类号： H04J1/00

CPC分类号： H04L27/2602 ,  H04B1/7103 ,  H04L27/2607 ,  H04L27/2608 ,  H04L27/261 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2656 ,  H04L27/2662 ,  H04L27/2688

摘要： 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 invention relates to a communications system in which a plurality of systems share the same frequency bandwidth so as to transmit information symbols. One of the plurality of systems 1 includes an identifying unit 109 configured to identify the symbol length of an information symbol transmitted in a different system 2; and an adjusting unit 102, 107 configured to adjust the symbol length of an information symbol to be transmitted, in accordance with an identified symbol length.

摘要翻译： 本发明的目的是提供一种通信系统等，其可以在混合使用不同传输方式的多个系统的区域中减少由于符号长度的差异而导致的来自其他系统的干扰的影响。 本发明涉及一种通信系统，其中多个系统共享相同的频率带宽以便发送信息符号。 多个系统1中的一个包括识别单元109，其被配置为识别在不同系统2中发送的信息符号的符号长度; 以及调整单元102,107，其被配置为根据所识别的符号长度来调整要发送的信息符号的符号长度。

公开(公告)号：US20050094552A1

公开(公告)日：2005-05-05

申请号：US10865817

申请日：2004-06-14

申请人： Tetsushi Abe ,  Hirohito Suda ,  Shigeru Tomisato ,  Hiromasa Fujii ,  Takefumi Yamada

发明人： Tetsushi Abe ,  Hirohito Suda ,  Shigeru Tomisato ,  Hiromasa Fujii ,  Takefumi Yamada

IPC分类号： H04L27/26 ,  H04B3/10 ,  H04J11/00

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/006

摘要： An object of the present invention is, in a communication path of which received signal quality is extremely poor, to prevent such a state of the communication failure. To a frame generator 13 in a transmitter 10, which transmits OFDM signal, a pilot & data arrangement format determiner 20, which determines pilot & data arrangement format of an OFDM signal based on the value of received signal quality at a receiver 30, a pilot symbol number determiner 19, which determines the number of pilot symbols based on the value of received signal quality, and a power amplification rate determiner 18, which determines power amplification rate based on the value of received signal quality, are newly provided. Thereby, it is possible to change the pilot & data arrangement format, the number of pilot symbols and the power amplification rate depending on the value of received signal quality to generate transmission signal frame of the OFDM signal. Owing to this, even in a channel of which received signal quality is poor, it is possible to satisfactorily reduce the transmission rate using adaptive modulation technique and maintain the channel estimation accuracy to a satisfactory level, and thus it is possible to prevent such a state of the communication failure.

摘要翻译： 本发明的目的是在接收信号质量极差的通信路径中，防止这种通信失败的状态。 导频和数据排列格式确定器20向发射机10发送OFDM信号的帧发生器13，导频和数据排列格式确定器20基于接收机30处的接收信号质量的值确定OFDM信号的导频和数据排列格式， 符号数确定器19，其基于接收信号质量的值来确定导频符号的数量，并且基于接收信号质量的值确定功率放大率的功率放大率确定器18。 因此，可以根据接收信号质量的值来改变导频和数据排列格式，导频符号数和功率放大率，以产生OFDM信号的发送信号帧。 由此，即使在接收信号质量差的信道中，也可以使用自适应调制技术令人满意地降低传输速率，并且将信道估计精度保持在令人满意的水平，因此可以防止这种状态 的通信故障。

公开(公告)号：US07215704B2

公开(公告)日：2007-05-08

申请号：US10670562

申请日：2003-09-26

申请人： Hiromasa Fujii ,  Tetsushi Abe ,  Shigeru Tomisato ,  Hirohito Suda

发明人： Hiromasa Fujii ,  Tetsushi Abe ,  Shigeru Tomisato ,  Hirohito Suda

IPC分类号： H03H7/30

CPC分类号： H04L25/03171 ,  H04L1/06 ,  H04L2025/03375

摘要： 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 cancel the remaining interference component and to perform multi-path combining, and in a degree-of-interference-cancellation estimation part 41n the degree of interference cancellation β(i) is set such that it is 0 for the iteration number i=1, 0.8+0.05 (i−1) for 5≧i≧2 and 1 for i≧6, and at the beginning of each iteration filter coefficients are calculated using β(i) and a channel estimation value in a filter coefficient calculating part 33n and the filter coefficient thus calculated are set in the filter 32n. An average value of soft decision symbol estimation values used in the interference canceling part may be used as β.

摘要翻译： 在用于MIMO（多输入多输出）turbo接收的自适应均衡装置中，使用干扰消除部分31中的干扰分量的副本从其中减去接收信号中的干扰分量， 减法输出由滤波器32滤波，以抵消剩余的干扰分量并执行多路径组合，并且在干涉消除度估计部分41 对于5> = i> = 2，对于迭代数i = 1,0.8 + 0.05（i-1），对于i> = 6，设置干扰消除度β（i）的程度为0 ，并且在每次迭代开始时，使用β（i）和滤波器系数计算部分33 N n中的信道估计值来计算滤波器系数，并且将如此计算的滤波器系数设置在滤波器32 SUB> n 。 在干扰消除部分中使用的软判决符号估计值的平均值可以用作β。

公开(公告)号：US07151808B2

公开(公告)日：2006-12-19

申请号：US10386571

申请日：2003-03-13

申请人： Hiromasa Fujii ,  Tetsushi Abe ,  Shigeru Tomisato ,  Hirohito Suda

发明人： Hiromasa Fujii ,  Tetsushi Abe ,  Shigeru Tomisato ,  Hirohito Suda

IPC分类号： H04L1/02 ,  H03D3/22

CPC分类号： H04B7/005 ,  H04L2025/03375

摘要： 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 these, received signal replicas Re1 ro ReN for the respective users are generated. The replicas are subtracted from the received signal to provide an error signal, and Re1 to ReN are added to Es to provide an interference suppressed received signals for the users 1 to N. to, te, H and Re1 to ReN are generated from these to generate Es in a repeated fashion to improve the accuracy of t0, te and H.

摘要翻译： 在包括用户数量增加的应用中，改善了均衡开始定时，均衡持续时间和信道估计的精度。 对于每个用户信号执行均衡开始定时t 0，均衡持续时间t和信道H估计，并且使用这些，接收信号副本Re 1 N 生成各个用户。 从接收到的信号中减去副本以提供误差信号，并且向Es提供Re 1，以向用户1提供干扰抑制的接收信号， 从这些生成N到，te，H和Re 1到Re N以重复的方式产生Es以提高t 0，te和H的精度。

公开(公告)号：US20060031583A1

公开(公告)日：2006-02-09

申请号：US10535859

申请日：2003-11-20

申请人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda ,  Tetsuhi Abe ,  Takefumi Yamada

发明人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda ,  Tetsuhi Abe ,  Takefumi Yamada

IPC分类号： G06F15/16

CPC分类号： H04L27/2602 ,  H04B1/7103 ,  H04L27/2607 ,  H04L27/2608 ,  H04L27/261 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2656 ,  H04L27/2662 ,  H04L27/2688

摘要： 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 invention relates to a communications system in which a plurality of systems share the same frequency bandwidth so as to transmit information symbols. One of the plurality of systems 1 includes an identifying unit 109 configured to identify the symbol length of an information symbol transmitted in a different system 2; and an adjusting unit 102, 107 configured to adjust the symbol length of an information symbol to be transmitted, in accordance with an identified symbol length.

摘要翻译： 本发明的目的是提供一种通信系统等，其可以在混合使用不同传输方式的多个系统的区域中减少由于符号长度不同而引起的其他系统的干扰的影响。 本发明涉及一种通信系统，其中多个系统共享相同的频率带宽以便发送信息符号。 多个系统1中的一个包括识别单元109，其被配置为识别在不同系统2中发送的信息符号的符号长度; 以及调整单元102,107，其被配置为根据所识别的符号长度来调整要发送的信息符号的符号长度。

公开(公告)号：US20050054318A1

公开(公告)日：2005-03-10

申请号：US10892147

申请日：2004-07-16

申请人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda

发明人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda

IPC分类号： H01Q1/24 ,  H01Q3/26 ,  H01Q3/44 ,  H01Q21/29 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L25/02 ,  H04B17/00 ,  G01S3/16 ,  G01S3/28 ,  H04B1/06 ,  H04B7/00 ,  H04M1/00

CPC分类号： H01Q21/29 ,  H01Q1/246 ,  H01Q3/2635 ,  H01Q3/44 ,  H04L1/0025 ,  H04L25/0202

摘要： 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 received signal caused due to the change in the impedance; and an instruction part providing the instruction signal which is changed in response to the measurement result.

摘要翻译： 无线电接收机包括用于从无线电发射机接收无线电信号的多个天线元件; 设置部分，根据指令信号改变所述多个天线元件中的至少一个的阻抗; 测量由于阻抗变化引起的接收信号中的吞吐量变化的测量部分; 以及提供响应于测量结果而改变的指令信号的指令部分。

公开(公告)号：US07006041B2

公开(公告)日：2006-02-28

申请号：US10892147

申请日：2004-07-16

申请人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda

发明人： Hiromasa Fujii ,  Shigeru Tomisato ,  Hirohito Suda

IPC分类号： H01Q3/24

CPC分类号： H01Q21/29 ,  H01Q1/246 ,  H01Q3/2635 ,  H01Q3/44 ,  H04L1/0025 ,  H04L25/0202

摘要： 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 received signal caused due to the change in the impedance; and an instruction part providing the instruction signal which is changed in response to the measurement result.

摘要翻译： 无线电接收机包括用于从无线电发射机接收无线电信号的多个天线元件; 设置部分，根据指令信号改变所述多个天线元件中的至少一个的阻抗; 测量由于阻抗变化引起的接收信号中的吞吐量变化的测量部分; 以及提供响应于测量结果而改变的指令信号的指令部分。

公开(公告)号：US20070153673A1

公开(公告)日：2007-07-05

申请号：US10537287

申请日：2003-12-02

申请人： Shigeru Tomisato ,  Hirohito Suda ,  Takefumi Yamada

发明人： Shigeru Tomisato ,  Hirohito Suda ,  Takefumi Yamada

IPC分类号： H04J11/00 ,  H04J1/00

CPC分类号： H04L27/2614 ,  H04L5/0016 ,  H04L25/0228 ,  H04L27/2602

摘要： Symbols converted by a serial-to-parallel converting part (12) from serial to parallel form are subjected to inverse Fourier transform processing in an inverse Fourier transform part (13) as sub-carrier signal components of a frequency interval equal to the symbol rate, then the levels of the resulting time domain signal components are compared with a permissible peak level Cth in a peak component detecting part (22) to detect peak components, and the peak components are transformed by a Fourier transform part (23) to frequency domain components, which are subtracted by subtractors (240 to 24N-1) from the corresponding sub-carrier signal components to thereby reduce the peak power.

摘要翻译： 由串并转换部分（12）从串行到并行形式转换的符号在逆傅里叶变换部分（13）中进行傅里叶逆变换处理，作为等于符号率的频率间隔的副载波信号分量 然后将所得到的时域信号分量的电平与峰值分量检测部分（22）中允许的峰值电平C SUB进行比较，以检测峰值分量，并且通过傅立叶变换将峰值分量变换 将变换部分（23）转换成从相应的子载波信号分量中减去减法器（24 <0>至24 N-1>）的频域分量，从而减少 峰值功率。

公开(公告)号：US07652981B2

公开(公告)日：2010-01-26

申请号：US10537287

申请日：2003-12-02

申请人： Shigeru Tomisato ,  Hirohito Suda ,  Takefumi Yamada

发明人： Shigeru Tomisato ,  Hirohito Suda ,  Takefumi Yamada

IPC分类号： H04L11/00

CPC分类号： H04L27/2614 ,  H04L5/0016 ,  H04L25/0228 ,  H04L27/2602

摘要： Symbols converted by a serial-to-parallel converting part (12) from serial to parallel form are subjected to inverse Fourier transform processing in an inverse Fourier transform part (13) as sub-carrier signal components of a frequency interval equal to the symbol rate, then the levels of the resulting time domain signal components are compared with a permissible peak level Cth in a peak component detecting part (22) to detect peak components, and the peak components are transformed by a Fourier transform part (23) to frequency domain components, which are subtracted by subtractors (240 to 24N−1) from the corresponding sub-carrier signal components to thereby reduce the peak power.

摘要翻译： 由串并转换部分（12）从串行到并行形式转换的符号在逆傅里叶变换部分（13）中进行傅里叶逆变换处理，作为等于符号率的频率间隔的副载波信号分量 ，然后将所得时域信号分量的电平与峰值分量检测部分（22）中允许的峰值电平Cth进行比较，以检测峰值分量，并将峰值分量由傅里叶变换部分（23）变换为频域 分量，由相应的副载波信号分量由减法器（240〜24N-1）减去，从而降低峰值功率。