公开(公告)号：US07400616B2

公开(公告)日：2008-07-15

申请号：US10545489

申请日：2004-06-18

申请人： Kazuyoshi Saito ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kengo Nagata ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

发明人： Kazuyoshi Saito ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kengo Nagata ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

IPC分类号： H04J3/24

CPC分类号： H04L1/1628 ,  H04L1/1685

摘要： A plurality of data packets that contain sequence numbers, respectively, are transmitted simultaneously between two STAs by using a wireless channel and MIMO. An STA receiving the plurality of data packets transmitted simultaneously by using MIMO generates a single ACK packet containing information that corresponds to a sequence number of each data packet successfully received, and transmits the single ACK packet to a transmit-side STA without using MIMO. Thus, a ratio of successful ACK packet receptions to total receptions can be increased. An effect of improving throughput achieved by simultaneous transmission can also be ensured.

摘要翻译： 通过使用无线信道和MIMO，分别在两个STA之间同时发送包含序列号的多个数据分组。 接收通过使用MIMO同时发送的多个数据分组的STA生成包含与成功接收的每个数据分组的序列号对应的信息的单个ACK分组，并且在不使用MIMO的情况下将单个ACK分组发送到发送侧STA。 因此，可以增加成功的ACK分组接收与总接收的比率。 还可以确保通过同时传输实现提高吞吐量的效果。

公开(公告)号：US20060171353A1

公开(公告)日：2006-08-03

申请号：US10548788

申请日：2004-06-18

申请人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

发明人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

IPC分类号： H04Q7/00 ,  H04L12/413

CPC分类号： H04B7/04 ,  H04L1/06 ,  H04L1/1887 ,  H04L1/1893 ,  H04L5/143 ,  H04L27/2601 ,  H04L2001/0096 ,  H04W28/04 ,  H04W72/1263 ,  H04W74/0808

摘要： In retransmission processing due to a failure of transmission of data packets, a plurality of data packets are simultaneously transmitted between two STAs by utilizing multiple wireless channels and MIMO, and the number of idle channels and the number of retransmission packets are compared. Then, when both of the numbers are different or only when the number of idle channels is larger than the number of retransmission packets, the retransmission packets are reconstructed according to the number of idle channels, and the reconstructed retransmission packets are simultaneously transmitted by using the idle channels.

摘要翻译： 在由于数据分组传输失败引起的重传处理中，通过利用多个无线信道和MIMO，在两个STA之间同时发送多个数据分组，并比较空闲信道的数量和重传分组的数量。 然后，当两个数不同或仅当空闲信道的数量大于重发分组数时，根据空闲信道的数量来重构重传分组，并且通过使用重发分组同时发送重构的重传分组 空闲频道。

公开(公告)号：US20060087998A1

公开(公告)日：2006-04-27

申请号：US10545489

申请日：2004-06-18

申请人： Kazuyoshi Saito ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kengo Nagata ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

发明人： Kazuyoshi Saito ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kengo Nagata ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

IPC分类号： H04Q7/00

CPC分类号： H04L1/1628 ,  H04L1/1685

摘要： A plurality of data packets that contain sequence numbers, respectively, are transmitted simultaneously between two STAs by using a wireless channel and MIMO. An STA receiving the plurality of data packets transmitted simultaneously by using MIMO generates a single ACK packet containing information that corresponds to a sequence number of each data packet successfully received, and transmits the single ACK packet to a transmit-side STA without using MIMO. Thus, a ratio of successful ACK packet receptions to total receptions can be increased. An effect of improving throughput achieved by simultaneous transmission can also be ensured.

摘要翻译： 通过使用无线信道和MIMO，分别在两个STA之间同时发送包含序列号的多个数据分组。 接收通过使用MIMO同时发送的多个数据分组的STA生成包含与成功接收的每个数据分组的序列号对应的信息的单个ACK分组，并且在不使用MIMO的情况下将单个ACK分组发送到发送侧STA。 因此，可以增加成功的ACK分组接收与总接收的比率。 还可以确保通过同时传输实现提高吞吐量的效果。

公开(公告)号：US06658063B1

公开(公告)日：2003-12-02

申请号：US09617750

申请日：2000-07-17

申请人： Masato Mizoguchi ,  Takeshi Onizawa ,  Tomoaki Kumagai ,  Masahiro Morikura

发明人： Masato Mizoguchi ,  Takeshi Onizawa ,  Tomoaki Kumagai ,  Masahiro Morikura

IPC分类号： H04K110

CPC分类号： H04L27/2662 ,  H04L27/2657 ,  H04L27/2675

摘要： A preamble for synchronization, or a reference timing for operation of an OFDM packet communication receiver system is detected finely even under environment of large waveform distortion due to thermal noise and/or multi-path propagation, and/or large carrier frequency offset between a transmit side and a receiver side. A correlator (1) detects a pattern of a short preamble (t1-t10) in a preamble for synchronization. An output of the correlator (1) is applied to a complex filter (7) which separates a short preamble having a predetermined repetition period from uniformly distributed noise. A scalar filter (9) integrates some period of short preambles which have distributed-delay by multi-path propagation as if a single short preamble with no delay were received for determining a reference timing. When a correlator output exceeds a predetermined threshold level a plurality of times for every repetition periods (T) of a short preamble, and an output of the correlator after time (T) from the last short preamble is decreased a predetermined ratio as compared with that of the last short preamble, it is determined that a preamble for synchronization is detected. Carrier frequency offset compensation is carried out either for each short preamble during reception of a short preamble, or based upon the last received short preamble during reception of an OFDM symbol after the last short preamble. As a preamble for synchronization is detected accurately, a guard interval of each OFDM symbol is removed accurately, or an FFT window is defined accurately, so that a demodulation is possible in spite of noise and/or interference.

摘要翻译： 即使在由于热噪声和/或多径传播引起的大波形失真的环境中，也可以精细地检测用于同步的前同步码，或用于OFDM分组通信接收机系统的操作的参考定时和/或发送之间的大载波频率偏移 侧和接收器侧。 相关器（1）检测用于同步的前同步码中的短前导码（t1-t10）的模式。 相关器（1）的输出被应用于将具有预定重复周期的短前导码与均匀分布的噪声分离的复数滤波器（7）。 标量滤波器（9）通过多路径传播将具有分布延迟的一些短前导码的一段周期集成，如同接收到没有延迟的单个短前导码一样用于确定参考定时。 当相关器输出超过预定阈值电平时，对于短前导码的每个重复周期（T）和来自最后的前导码的时间（T）之后的相关器的输出的多次，与之相比减小了预定比率 在最后的短前导码中，确定检测到用于同步的前同步码。 在接收短前导码期间，或者基于在最后的短前导码之后的OFDM符号的接收期间的最后接收的短前导码，对于每个短前导码执行载波频率偏移补偿。 由于精确地检测到同步的前导码，所以准确地去除了每个OFDM符号的保护间隔，或者准确地定义了FFT窗口，使得即使有噪声和/或干扰，解调也是可能的。

公开(公告)号：US06608863B1

公开(公告)日：2003-08-19

申请号：US09506076

申请日：2000-02-16

申请人： Takeshi Onizawa ,  Masato Mizoguchi ,  Tomoaki Kumagai ,  Tetsu Sakata ,  Masahiro Morikura

发明人： Takeshi Onizawa ,  Masato Mizoguchi ,  Tomoaki Kumagai ,  Tetsu Sakata ,  Masahiro Morikura

IPC分类号： H03H730

CPC分类号： H04L25/0236 ,  H04L5/0007 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2647

摘要： A coherent detection system for multicarrier modulation system capable of accurate channel estimation even in severe environment with high thermal noise and deep multipath fading, has been found with simple structure and small circuit size. The present coherent detection system comprises a channel estimation circuit (208) for estimating a channel attenuation of a preamble part of each subcarriers, an adaptive filter (210, 211) for smoothing estimated channel attenuation among subcarriers, a divider (213) for coherent detection of a data part by dividing a receive vector by smoothed estimated channel attenuation for each subcarriers, and a characteristic extraction circuit (209) for extracting characteristic value of each subcarriers. The adaptive filter (210, 211) is controlled depending upon characteristic value of each subcarriers measured by the characteristic extraction circuit (209). A characteristic value may be amplitude, phase rotation, vector difference, modulation system, of each subcarriers, and/or combination of those values.

摘要翻译： 已经发现，即使在具有高热噪声和深多径衰落的恶劣环境中也能够精确地进行信道估计的多载波调制系统的相干检测系统，结构简单，电路尺寸小。 本相干检测系统包括用于估计每个子载波的前导码部分的信道衰减的信道估计电路（208），用于平滑子载波之间的估计信道衰减的自适应滤波器（210,211），用于相干检测的分频器（213） 通过用接收矢量除以每个子载波的平滑估计的信道衰减来分配数据部分，以及用于提取每个子载波的特征值的特征提取电路（209）。 根据由特征提取电路（209）测量的每个子载波的特性值来控制自适应滤波器（210,211）。 特征值可以是每个子载波的振幅，相位旋转，矢量差，调制系统，和/或这些值的组合。

公开(公告)号：US07545781B2

公开(公告)日：2009-06-09

申请号：US10549242

申请日：2004-07-14

申请人： Shinya Otsuki ,  Tomoaki Kumagai ,  Kengo Nagata ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Yasuhiko Inoue

发明人： Shinya Otsuki ,  Tomoaki Kumagai ,  Kengo Nagata ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Yasuhiko Inoue

IPC分类号： H04Q7/24

CPC分类号： H04W74/0816 ,  H04W36/16

摘要： A transmit-side STA transmits a wireless packet using a wireless channel which has been determined to be idle by both a physical carrier sense for determining based on received power whether the wireless channel is busy or idle and a virtual carrier sense for determining the wireless channel to be busy during set transmission inhibition time. At this time, the transmit-side STA sets transmission time used for the virtual carrier sense to a paired wireless channel which is affected by leakage from a transmitting wireless channel. This allows for setting transmission inhibition time to a paired wireless channel even when the paired wireless channel cannot successfully receive due to the effect caused by leakage from the transmitting wireless channel.

摘要翻译： 发送侧STA使用无线信道来发送无线信道，该无线信道已经被确定为基于接收到的功率的用于确定的物理载波侦听是空闲的，无论无线信道是忙还是空闲，以及用于确定无线信道的虚拟载波侦听 在设置传输禁止时间期间忙。 此时，发送侧STA将用于虚拟载波侦听的传输时间设置为受来自发射无线信道的泄漏影响的成对无线信道。 这允许即使当成对的无线信道由于从发送无线信道的泄漏引起的影响而不能成功接收时，也可以将配置的无线信道的传输禁止时间设置为一个。

公开(公告)号：US20060233146A1

公开(公告)日：2006-10-19

申请号：US10553107

申请日：2004-09-09

申请人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa

发明人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa

IPC分类号： H04B7/216

CPC分类号： H04W74/0808 ,  H04W72/02

摘要： In a wireless packet communication method for transmitting a plurality of wireless packets simultaneously by using multiple wireless channels determined to be idle by carrier sense, a wireless channel determined to be idle and MIMO, or the multiple wireless channel and the MIMO, a mandatory channel that is always used for transmission is set. The wireless packets are transmitted by using the wireless channel(s) including the mandatory channel only when the mandatory channel is idle. That is, in case of transmitting a plurality of wireless packets simultaneously, transmission is performed by using the wireless channel(s) including the mandatory channel, and transmission is not performed when the mandatory channel is not idle.

摘要翻译： 在无线分组通信方法中，通过使用确定为空闲的多个无线信道，通过载波侦听，确定为空闲的无线信道，MIMO或多个无线信道和MIMO来同时发送多个无线分组， 始终用于传输设置。 只有当强制性信道空闲时，无线数据包才通过使用包含强制信道的无线信道进行传输。 也就是说，在同时发送多个无线分组的情况下，通过使用包括强制信道的无线信道来执行传输，并且当强制信道不空闲时不执行传输。

公开(公告)号：US07058002B1

公开(公告)日：2006-06-06

申请号：US09787927

申请日：2000-04-21

申请人： Tomoaki Kumagai ,  Masahiro Morikura ,  Masato Mizoguchi

发明人： Tomoaki Kumagai ,  Masahiro Morikura ,  Masato Mizoguchi

IPC分类号： H04J11/00

CPC分类号： H04L27/2662 ,  H04L27/2657 ,  H04L27/266 ,  H04L27/2695

摘要： In an OFDM packet communication receiver, the deterioration of received signal quality is suppressed, even when carrier frequency error and/or clock frequency error exists between a transmitter and a receiver, and/or phase noise and/or thermal noise is superimposed to a received signal in a receiver.

摘要翻译： 在OFDM分组通信接收机中，即使发射机与接收机之间存在载波频率误差和/或时钟频率误差，也可以抑制接收信号质量的恶化，和/或将相位噪声和/或热噪声叠加到接收到的信号质量 信号在接收机。

公开(公告)号：US08989108B2

公开(公告)日：2015-03-24

申请号：US13108504

申请日：2011-05-16

申请人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

发明人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Atsushi Ohta ,  Akinori Hirukawa

IPC分类号： H04W4/00 ,  H04B7/216 ,  H04L12/413 ,  H04J3/24 ,  H04B7/04 ,  H04L1/06 ,  H04L1/18 ,  H04L5/14 ,  H04L27/26 ,  H04L1/00 ,  H04W28/04 ,  H04W72/12 ,  H04W74/08

CPC分类号： H04B7/04 ,  H04L1/06 ,  H04L1/1887 ,  H04L1/1893 ,  H04L5/143 ,  H04L27/2601 ,  H04L2001/0096 ,  H04W28/04 ,  H04W72/1263 ,  H04W74/0808

摘要： In retransmission processing due to a failure of transmission of data packets, a plurality of data packets are simultaneously transmitted between two STAs by utilizing multiple wireless channels and MIMO, and the number of idle channels and the number of retransmission packets are compared. Then, when both of the numbers are different or only when the number of idle channels is larger than the number of retransmission packets, the retransmission packets are reconstructed according to the number of idle channels, and the reconstructed retransmission packets are simultaneously transmitted by using the idle channels.

摘要翻译： 在由于数据分组传输失败引起的重传处理中，通过利用多个无线信道和MIMO，在两个STA之间同时发送多个数据分组，并比较空闲信道的数量和重传分组的数量。 然后，当两个数不同或仅当空闲信道的数量大于重发分组数时，根据空闲信道的数量来重构重传分组，并且通过使用重发分组同时发送重构的重传分组 空闲频道。

公开(公告)号：US20110194517A1

公开(公告)日：2011-08-11

申请号：US13088801

申请日：2011-04-18

申请人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Akinori Hirukawa ,  Atsushi Ohta

发明人： Kengo Nagata ,  Tomoaki Kumagai ,  Shinya Otsuki ,  Kazuyoshi Saito ,  Satoru Aikawa ,  Akinori Hirukawa ,  Atsushi Ohta

IPC分类号： H04W72/04

CPC分类号： H04W28/06 ,  H04B7/02 ,  H04W28/04 ,  H04W74/00

摘要： When a transmission rate of each of lines that transmit data simultaneously between two STAs by using a plurality of radio channels and/or MIMO can be set independently, one data frame is fragmented in accordance with the transmission rates of the respective lines so as to generate a plurality of data packets having the same packet time length and data sizes equal to or smaller than a maximum data size. Those data packets are transmitted simultaneously by using a plurality of radio channels, or one radio channel and MIMO, or a plurality of radio channels and MIMO.

摘要翻译： 当可以独立地设置通过使用多个无线电信道和/或MIMO来在两个STA之间同时发送数据的每行的传输速率时，根据各行的传输速率将一个数据帧分段，以产生 具有相同分组时间长度和等于或小于最大数据大小的数据大小的多个数据分组。 这些数据分组通过使用多个无线电信道或一个无线电信道和MIMO或多个无线电信道和MIMO同时发送。