公开(公告)号：US07649950B2

公开(公告)日：2010-01-19

申请号：US11353148

申请日：2006-02-14

Applicant: Jiyun Shen ,  Hiromasa Fujii ,  Takahiro Asai ,  Hitoshi Yoshino

Inventor： Jiyun Shen ,  Hiromasa Fujii ,  Takahiro Asai ,  Hitoshi Yoshino

IPC: H04L27/28

CPC classification number: H04L27/2621

Abstract: An OFDM transmitter that performs a peak reduction process in a stepwise manner on a signal sequence to be transmitted. The transmitter includes a dividing IFFT unit that divides a signal sequence into a plurality of signal sequences and IFFTs each of the signal sequences to obtain time signal sequences. Then, a first peak reduction processing unit cyclically shifts a first one of the time signal sequences by a first amount of cyclic shift obtained based on a first threshold to obtain a first cyclically shifted time signal sequence, and adds the first cyclically shifted time signal sequence and a second one of the time signal sequences. Meanwhile, a second peak reduction processing unit cyclically shifts a third one of the time signal sequences by a second amount of cyclic shift obtained based on a second threshold to obtain a second cyclically shifted time signal sequence.

Abstract translation: OFDM发送器，对要发送的信号序列进行逐步的峰值缩减处理。 发射机包括分频IFFT单元，其将信号序列划分成多个信号序列，并将IFFT分别为每个信号序列以获得时间信号序列。 然后，第一峰值降低处理单元将第一个时间信号序列循环移位基于第一阈值获得的第一循环移位量，以获得第一循环移位时间信号序列，并将第一循环移位时间信号序列 和第二个时间信号序列。 同时，第二峰值降低处理单元将第三个时间信号序列循环移位基于第二阈值获得的第二循环移位量，以获得第二循环移位时间信号序列。

公开(公告)号：US07532567B2

公开(公告)日：2009-05-12

申请号：US11121077

申请日：2005-05-04

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

IPC: H04J11/00

CPC classification number: H04L27/2614

Abstract: A radio transmitter adopting the OFDM scheme is disclosed. The radio transmitter includes an amplitude measuring part for measuring the amplitude of a transmission signal on which inverse Fourier transform has been performed; a power control part for outputting, based on the result of the measurement, control signals each for adjusting the amplitude of a signal on which inverse Fourier transform has not been performed, each signal corresponding to one of plural sub-carriers; and multiple multiplying parts each for multiplying the amplitude of the signal by a multiplying number indicated by the control signal. The power control part outputs the control signal based on a product of a signal pf(n) obtained by performing Fourier transform on an output of the amplitude measuring part and the signal sf(n).

Abstract translation: 公开了采用OFDM方案的无线电发射机。 无线发射机包括：振幅测量部分，用于测量已执行反傅里叶变换的发射信号的振幅; 功率控制部分，用于基于测量结果输出用于调整未进行傅立叶逆变换的信号的振幅的控制信号，每个信号对应于多个子载波中的一个; 以及多个乘法器，用于将信号的振幅乘以由控制信号指示的乘数。 功率控制部分基于对幅度测量部分的输出和信号sf（n）执行傅里叶变换获得的信号pf（n）的乘积，输出控制信号。

公开(公告)号：US20050254556A1

公开(公告)日：2005-11-17

申请号：US11128190

申请日：2005-05-13

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

IPC: H04J99/00 ,  H04B7/04 ,  H04J11/00 ,  H04L1/06 ,  H04L25/02 ,  H04L27/26 ,  H04B1/707

CPC classification number: H04L1/0618 ,  H04B17/24 ,  H04L27/2602

Abstract: A wireless communication system is disclosed that transmits a feedback signal containing a channel estimate value between a first wireless communication device and a second wireless communication device. The first wireless communication device that transmits the feedback signals includes: a channel estimation unit that receives signals containing pilot signals, and determines the channel estimate value of a wireless link; a multiplier that multiplies a pilot signal by the channel estimate value; and a multiplexer that multiplexes an output signal from the multiplier with another pilot signal, to generate the feedback signal. The second wireless communication device that receives the feedback signal includes: a separator that separates the signals that are multiplexed in the feedback signal; and channel estimation units that determine the channel estimate value of the wireless link, based on the separated signals.

Abstract translation: 公开了一种在第一无线通信设备和第二无线通信设备之间传送包含信道估计值的反馈信号的无线通信系统。 发送反馈信号的第一无线通信装置包括：信道估计单元，其接收包含导频信号的信号，并确定无线链路的信道估计值; 乘法器，用于将导频信号乘以信道估计值; 以及多路复用器，其将来自乘法器的输出信号与另一导频信号进行复用，以产生反馈信号。 接收反馈信号的第二无线通信装置包括：将反馈信号中多路复用的信号分离的分离器; 以及基于分离的信号来确定无线链路的信道估计值的信道估计单元。

公开(公告)号：US07684476B2

公开(公告)日：2010-03-23

申请号：US11128190

申请日：2005-05-13

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

IPC: H04B1/38

CPC classification number: H04L1/0618 ,  H04B17/24 ,  H04L27/2602

Abstract: A wireless communication system is disclosed that transmits a feedback signal containing a channel estimate value between a first wireless communication device and a second wireless communication device. The first wireless communication device that transmits the feedback signals includes: a channel estimation unit that receives signals containing pilot signals, and determines the channel estimate value of a wireless link; a multiplier that multiplies a pilot signal by the channel estimate value; and a multiplexer that multiplexes an output signal from the multiplier with another pilot signal, to generate the feedback signal. The second wireless communication device that receives the feedback signal includes: a separator that separates the signals that are multiplexed in the feedback signal; and channel estimation units that determine the channel estimate value of the wireless link, based on the separated signals.

Abstract translation: 公开了一种在第一无线通信设备和第二无线通信设备之间传送包含信道估计值的反馈信号的无线通信系统。 发送反馈信号的第一无线通信装置包括：信道估计单元，其接收包含导频信号的信号，并确定无线链路的信道估计值; 乘法器，用于将导频信号乘以信道估计值; 以及多路复用器，其将来自乘法器的输出信号与另一导频信号进行复用，以产生反馈信号。 接收反馈信号的第二无线通信装置包括：将反馈信号中多路复用的信号分离的分离器; 以及基于分离的信号来确定无线链路的信道估计值的信道估计单元。

公开(公告)号：US20060193393A1

公开(公告)日：2006-08-31

申请号：US11353148

申请日：2006-02-14

Applicant: Jiyun Shen ,  Hiromasa Fujii ,  Takahiro Asai ,  Hitoshi Yoshino

Inventor： Jiyun Shen ,  Hiromasa Fujii ,  Takahiro Asai ,  Hitoshi Yoshino

IPC: H04K1/10

CPC classification number: H04L27/2621

Abstract: An OFDM transmitter is configured to perform a peak reduction process on a signal sequence to be transmitted in a stepwise manner to transmit a peak processed transmission signal. The OFDM transmitter includes a dividing inverse fast Fourier transform unit (104) configured to divide the signal sequence to be transmitted into N signal sequences (N>2) and perform inverse fast Fourier transform on each of the divided signal sequences to output N time signal sequences; a threshold control unit (106) configured to determine at least two threshold values (Cth) used in the stepwise peak reduction process; and a first peak reduction processing unit (1201) configured to determine a first cyclic shift to be applied to one of the time signal sequences based on a first one of the threshold values, produce a first cyclically shifted signal sequence according to the first cyclic shift, and output a first peak processed signal sequence based on the first cyclically shifted signal sequence. The first cyclic shift is determined such that an exceeding power level over the first threshold value in the first peak processed signal sequence becomes the minimum.

Abstract translation: OFDM发送器被配置为对要以逐步方式发送的信号序列执行峰值降低处理，以发送峰值处理的发送信号。 所述OFDM发射机包括：分频逆快速傅里叶变换单元，被配置为将要发送的信号序列划分为N个信号序列（N> 2），并对每个分割信号序列进行快速傅立叶逆变换，以输出N个时间信号 序列; 阈值控制单元（106），被配置为确定在所述逐步峰值降低处理中使用的至少两个阈值（C SUB）; 以及第一峰值缩减处理单元（120“1”），其被配置为基于所述阈值中的第一个来确定要施加到所述时间信号序列之一的第一循环移位，产生第一循环移位 信号序列，并且基于第一循环移位信号序列输出第一峰值处理信号序列。 确定第一循环移位，使得在第一峰值处理信号序列中超过第一阈值的超过功率电平变为最小。

公开(公告)号：US20050259565A1

公开(公告)日：2005-11-24

申请号：US11121077

申请日：2005-05-04

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hitoshi Yoshino

IPC: H04J11/00 ,  H04B1/04 ,  H04L27/26

CPC classification number: H04L27/2614

Abstract: A radio transmitter adopting the OFDM scheme is disclosed. The radio transmitter includes an amplitude measuring part for measuring the amplitude of a transmission signal on which inverse Fourier transform has been performed; a power control part for outputting, based on the result of the measurement, control signals each for adjusting the amplitude of a signal on which inverse Fourier transform has not been performed, each signal corresponding to one of plural sub-carriers; and multiple multiplying parts each for multiplying the amplitude of the signal by a multiplying number indicated by the control signal. The power control part outputs the control signal based on a product of a signal pf(n) obtained by performing Fourier transform on an output of the amplitude measuring part and the signal sf(n).

Abstract translation: 公开了采用OFDM方案的无线电发射机。 无线电发射机包括用于测量其上进行了傅立叶逆变换的传输信号的幅度的幅度测量部分; 功率控制部分，用于基于测量结果输出用于调整未进行傅立叶逆变换的信号的振幅的控制信号，每个信号对应于多个子载波中的一个; 以及多个乘法器，用于将信号的振幅乘以由控制信号指示的乘数。 功率控制部分基于通过对振幅测量部分的输出执行傅里叶变换而得到的信号p（n）（n）的乘积和信号s （n）。

公开(公告)号：US07590200B2

公开(公告)日：2009-09-15

申请号：US11106433

申请日：2005-04-15

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hirohito Suda

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hirohito Suda

IPC: H04B7/10

CPC classification number: H04L25/0236 ,  H04L1/0006 ,  H04L25/0204

Abstract: A radio communication system including a transmitter and a receiver (100) for transmitting MIMO channel signals is provided. The transmitter comprises a pilot signal insertion controller (93) for inserting a pilot signal for channel estimation into at least a leading frame; and an information symbol controller for controlling the number of information symbols to be contained in a frame, based on the existence of the pilot signal. The receiver comprises a received signal replica generator (112) for generating received signal replicas based on previously obtained provisional channel estimation values and transmission signal estimation values; a canceller (111) for removing, from a received signal, received signal replicas of at least a part of streams that are not channel estimation target streams; and a channel estimation value generator (113) for generating channel estimation values by a filter using outputs from the removing unit and the transmission signal estimation values.

Abstract translation: 提供了一种包括用于发送MIMO信道信号的发射机和接收机（100）的无线电通信系统。 所述发射机包括导频信号插入控制器（93），用于将用于信道估计的导频信号插入至少一个引导帧; 以及信息符号控制器，用于基于导频信号的存在来控制要包含在帧中的信息符号的数量。 接收机包括接收信号副本发生器（112），用于基于先前获得的临时信道估计值和传输信号估计值来产生接收信号副本; 用于从接收到的信号中去除不是信道估计目标流的流的至少一部分的接收信号副本的消除器（111） 以及信道估计值发生器（113），用于通过使用来自去除单元的输出和发送信号估计值的滤波器来生成信道估计值。

公开(公告)号：US20050265226A1

公开(公告)日：2005-12-01

申请号：US11135413

申请日：2005-05-24

Applicant: Jiyun Shen ,  Hiromasa Fujii ,  Takahiro Asai ,  Hirohito Suda

Inventor： Jiyun Shen ,  Hiromasa Fujii ,  Takahiro Asai ,  Hirohito Suda

IPC: H04J11/00 ,  H04L25/02 ,  H04L27/26

CPC classification number: H04L27/2614 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2613 ,  H04L27/2621 ,  H04L27/2624

Abstract: A transmission apparatus used in a radio communication system adopting the OFDM scheme is disclosed. The transmission apparatus includes: a dividing inverse Fourier transform part including plural transform parts, wherein the dividing inverse Fourier transform part divides a signal to be transmitted into plural signals, and each of the plural transform parts performs inverse Fourier transform on one of the plural signals; a peak control part for outputting a peak control signal based on peaks that are detected from output signals of the dividing inverse Fourier transform part; and a peak reducing process part for adjusting a weight or an arranging order of an output signal of the dividing inverse Fourier transform part according to the peak control signal to output an adjusted signal, and synthesizing the adjusted signal with other signal so as to output a synthesized signal.

Abstract translation: 公开了在采用OFDM方案的无线通信系统中使用的发送装置。 发送装置包括：分割逆傅里叶变换部分，包括多个变换部分，其中分割付里叶逆变换部分将要发送的信号划分为多个信号，并且多个变换部分中的每一个对多个信号中的一个信号进行傅立叶逆变换 ; 峰值控制部分，用于基于从分割付里叶逆变换部分的输出信号检测的峰值输出峰值控制信号; 以及峰值降低处理部分，用于根据峰值控制信号调整除法逆傅立叶逆变换部分的输出信号的权重或排列顺序，以输出调整后的信号，并将调整后的信号与其他信号合成，以输出 合成信号。

公开(公告)号：US20050276360A1

公开(公告)日：2005-12-15

申请号：US11106433

申请日：2005-04-15

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hirohito Suda

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hirohito Suda

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04L25/02 ,  H04B7/10 ,  H04B1/707

CPC classification number: H04L25/0236 ,  H04L1/0006 ,  H04L25/0204

Abstract: A radio communication system including a transmitter and a receiver (100) for transmitting MIMO channel signals is provided. The transmitter comprises a pilot signal insertion controller (93) for inserting a pilot signal for channel estimation into at least a leading frame; and an information symbol controller for controlling the number of information symbols to be contained in a frame, based on the existence of the pilot signal. The receiver comprises a received signal replica generator (112) for generating received signal replicas based on previously obtained provisional channel estimation values and transmission signal estimation values; a canceller (111) for removing, from a received signal, received signal replicas of at least a part of streams that are not channel estimation target streams; and a channel estimation value generator (113) for generating channel estimation values by a filter using outputs from the removing unit and the transmission signal estimation values.

Abstract translation: 提供了一种包括用于发送MIMO信道信号的发射机和接收机（100）的无线电通信系统。 所述发射机包括导频信号插入控制器（93），用于将用于信道估计的导频信号插入至少一个引导帧; 以及信息符号控制器，用于基于导频信号的存在来控制要包含在帧中的信息符号的数量。 接收机包括接收信号副本发生器（112），用于基于先前获得的临时信道估计值和传输信号估计值来产生接收信号副本; 用于从接收到的信号中去除不是信道估计目标流的流的至少一部分的接收信号副本的消除器（111） 以及信道估计值发生器（113），用于通过使用来自去除单元的输出和发送信号估计值的滤波器来生成信道估计值。

公开(公告)号：US07499496B2

公开(公告)日：2009-03-03

申请号：US11136520

申请日：2005-05-25

Applicant: Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hirohito Suda

Inventor： Hiromasa Fujii ,  Jiyun Shen ,  Takahiro Asai ,  Hirohito Suda

IPC: H04K1/10

CPC classification number: H04L27/2621

Abstract: An OFDM transmitter (100) is disclosed. The OFDM transmitter comprises: a sorter (103-1) for sorting plural input complex signals and partitioning them into plural groups; plural IFFTs (103-2) for performing inverse Fourier transform on the input complex signals in groups; a peak reducer (103-4) for performing peak reduction, based on outputs from at least one of the IFFTs; and a multiple discrete signal generator (103-5) for generating a designated number of discrete signals from outputs of the peak reducer.

Abstract translation: 公开了一种OFDM发射机（100）。 所述OFDM发射机包括：分类器（103-1），用于对多个输入复合信号进行分类并将其分成多个组; 多个IFFT（103-2），用于对组中的输入复信号进行傅里叶逆变换; 基于来自所述IFFT中的至少一个的输出，执行峰值降低的峰值减速器（103-4）; 以及用于从所述峰值衰减器的输出产生指定数量的离散信号的多重离散信号发生器（103-5）。