公开(公告)号：US5771223A

公开(公告)日：1998-06-23

申请号：US621338

申请日：1996-03-25

申请人： Tomohiro Kimura ,  Yasuo Harada ,  Hiroshi Hayashino ,  Yasuhiro Uno

发明人： Tomohiro Kimura ,  Yasuo Harada ,  Hiroshi Hayashino ,  Yasuhiro Uno

IPC分类号： H04J11/00 ,  H04L1/00 ,  H04L27/26 ,  H04B7/204

CPC分类号： H04L1/0071 ,  H04L1/006 ,  H04L27/2647

摘要： A Fourier transform circuit in a receiver performs a Fourier transform on a orthogonal frequency division multiplexing signal received through a transmission channel for each symbol to sequentially reproduce a received reference vector sequence and a received vector sequence. An interleave circuit interleaves elements of the received reference vector sequence and the received vector sequence. A memory stores the received reference vector sequence. A vector modulation circuit modulates the received reference vector sequence by respective signal point vectors representing each signal point to generate a modulation vector sequence for each symbol. A metric generation circuit then obtains a difference between the received vector sequence and the modulation vector sequence to generate the difference as a branch metric sequence. A trellis decode circuit reproduces a data sequence on the basis of the branch metric sequence.

摘要翻译： 接收机中的傅里叶变换电路对通过每个符号的传输信道接收的正交频分多路复用信号执行傅里叶变换，以顺序再现接收的参考矢量序列和接收的矢量序列。 交错电路对所接收的参考矢量序列和接收的矢量序列的元素进行交织。 存储器存储所接收的参考矢量序列。 矢量调制电路通过表示每个信号点的相应信号点矢量来调制接收到的参考矢量序列，以生成每个符号的调制矢量序列。 然后，度量产生电路获得接收的矢量序列和调制矢量序列之间的差异，以产生差分作为分支度量序列。 网格解码电路基于分支度量序列再现数据序列。

公开(公告)号：US5774450A

公开(公告)日：1998-06-30

申请号：US580887

申请日：1995-12-29

申请人： Yasuo Harada ,  Tomohiro Kimura ,  Hiroshi Oue ,  Yasuo Nagaishi ,  Hiroshi Hayashino ,  Yasuhiro Uno

发明人： Yasuo Harada ,  Tomohiro Kimura ,  Hiroshi Oue ,  Yasuo Nagaishi ,  Hiroshi Hayashino ,  Yasuhiro Uno

IPC分类号： H04L27/26 ,  H04J11/00 ,  H04L27/34

CPC分类号： H04L27/2613 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2679 ,  H04L27/2682

摘要： An orthogonal frequency division multiplexing signal transmitted from the transmitting end to the receiving end intermittently includes a particular symbol S0 having a predetermined particular pattern in addition to a symbol Sm including data to be transmitted. At the receiving end, the variation in the receiving level and/or the variation in the frequency band of a received signal are detected and corrected on the basis of the received particular symbol S0. Since the particular symbol S0 has a particular pattern, the variation in the level and/or the variation in the frequency are strongly correlated with the variation in the receiving level and/or the variation in the frequency band of the received signal. Consequently, the variation in the receiving level and/or the variation in the frequency band of the received signal can be accurately detected from the particular symbol S0 and consequently high-precision correction can be made.

摘要翻译： 从发送端到接收端间歇地发送的正交频分复用信号除了包括要发送的数据的符号Sm之外还包括具有预定特定模式的特定符号S0。 在接收端，基于所接收的特定符号S0来检测和校正接收信号的接收电平的变化和/或频带的变化。 由于特定符号S0具有特定的模式，所以电平和/或频率变化的变化与接收信号的接收电平的变化和/或频带的变化密切相关。 因此，可以从特定符号S0精确地检测接收电平的接收电平的变化和/或频带的变化，从而可以进行高精度校正。

公开(公告)号：US5734972A

公开(公告)日：1998-03-31

申请号：US621340

申请日：1996-03-25

申请人： Hiroshi Hayashino ,  Yasuo Harada ,  Tomohiro Kimura ,  Yasuhiro Uno

发明人： Hiroshi Hayashino ,  Yasuo Harada ,  Tomohiro Kimura ,  Yasuhiro Uno

IPC分类号： H04L27/00 ,  H04L27/227 ,  H04B1/18

CPC分类号： H04L27/2273 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0095

摘要： A pilot signal (a signal having known phase information and a prescribed length) is inserted at a prescribed time interval in a signal transmitted from a transmitting end to a receiving end. An arc tangent operation circuit (22) performs an operation for arc tangent of the pilot signal in a received signal to obtain a phase of the pilot signal. A phase error operation circuit (24) determines for a phase error between the known phase information previously held in a memory (23) and an output from the arc tangent operation circuit (22). A linear approximation circuit (25) takes an output from the phase difference operation circuit (24) as a linear function of time, and linear-approximates the output. A frequency error operation circuit (26) obtains for a frequency error from a slope of an output from the linear approximation circuit (25). In response to the obtained frequency error, control of an oscillation frequency of a variable frequency oscillation circuit allows rapid automatic frequency control with high accuracy.

摘要翻译： 在从发送端发送到接收端的信号中，以规定的时间间隔插入导频信号（具有已知相位信息和规定长度的信号）。 反正切运算电路（22）在接收信号中进行导频信号的反正切运算，得到导频信号的相位。 相位误差运算电路（24）确定先前保存在存储器（23）中的已知相位信息与反正切运算电路（22）的输出之间的相位误差。 线性近似电路（25）将相位差运算电路（24）的输出作为时间的线性函数，对输出进行线性近似。 频率误差运算电路（26）从线性近似电路（25）的输出的斜率求出频率误差。 响应于获得的频率误差，可变频率振荡电路的振荡频率的控制允许高精度的快速自动频率控制。

公开(公告)号：US5682376A

公开(公告)日：1997-10-28

申请号：US572719

申请日：1995-12-14

申请人： Hiroshi Hayashino ,  Yasuo Harada ,  Tomohiro Kimura ,  Yasuhiro Uno ,  Hiroshi Oue

发明人： Hiroshi Hayashino ,  Yasuo Harada ,  Tomohiro Kimura ,  Yasuhiro Uno ,  Hiroshi Oue

IPC分类号： H04L27/26 ,  H04J11/00 ,  H04L27/28

CPC分类号： H04L27/2607 ,  H04L27/2614

摘要： A complex multiplier complex-multiplies a carrier modulation signal group for decoding the phases and amplitudes of a plurality of carriers which are orthogonal to each other on the frequency axis by a complex signal group having a predetermined specific pattern which varies in phase at random. An inverse Fourier transformer performs inverse Fourier transformation on an output of the complex multiplier, for transforming a digital signal which is multiplexed on the frequency axis to an OFDM signal on the time axis. A guard interval insertion part adds front and rear guard intervals to front and rear parts of each symbol of the OFDM signal respectively. The front and rear guard intervals include data which are identical to those of rear and front end parts of the corresponding symbol respectively. Arithmetic processing which is reverse to that on a transmission side is performed on a receiving side, whereby distortion of received data is removed. Thus, the OFDM signal can be transmitted with no waveform distortion on a data component of each symbol on the frequency axis after Fourier transformation even if a reflected wave is superposed on a direct wave due to a multipath.

摘要翻译： 复数乘法器复数乘法载波调制信号组，用于解码在频率轴上彼此正交的多个载波的相位和幅度，具有随机相位变化的预定特定模式的复信号组。 傅里叶逆变换器对复数乘法器的输出执行逆傅立叶变换，用于将在频率轴上复用的数字信号在时间轴上变换为OFDM信号。 保护间隔插入部分分别向OFDM信号的每个符号的前后部分添加前后保护间隔。 前后保护间隔包括与相应符号的后端部分和前端部分相同的数据。 在接收侧执行与发送侧相反的算术处理，从而去除接收数据的失真。 因此，即使由于多径而将反射波叠加在直接波上，也可以在傅立叶变换之后的频率轴上的每个符号的数据分量上不发送波形失真的OFDM信号。

公开(公告)号：US07085233B2

公开(公告)日：2006-08-01

申请号：US09972962

申请日：2001-10-10

申请人： Hiroshi Hayashino ,  Kazuhiro Ando ,  Shinichiro Ohmi ,  Yasuo Harada

发明人： Hiroshi Hayashino ,  Kazuhiro Ando ,  Shinichiro Ohmi ,  Yasuo Harada

IPC分类号： H04L12/56

CPC分类号： H04L1/1887 ,  H04L1/0003 ,  H04L2001/0093 ,  H04L2001/0095 ,  H04W74/02

摘要： In serial transmission of a mixture of isochronous data and anisochronous data, communications through a transmission path with a high ratio of occurrence of transmission errors may disturb images during streaming reproduction and produce noise in sound. To solve this problem, the isochronous data that has not been successfully received is retransmitted by using an anisochronous region. Thus, a transmission error of the isochronous data can be reduced without impairment of isochronous characteristics of the data.

摘要翻译： 在串行传输同步数据和不同步数据的混合的情况下，通过具有高传输错误发生率的传输路径的通信可能在流再现期间干扰图像并产生噪声。 为了解决这个问题，通过使用不同步区域来重发未成功接收的同步数据。 因此，可以减少同步数据的传输错误而不损害数据的等时特性。

公开(公告)号：US06944122B2

公开(公告)日：2005-09-13

申请号：US10614291

申请日：2003-07-08

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： H04L27/26 ,  H04J11/00

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：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：US06169751A

公开(公告)日：2001-01-02

申请号：US09036784

申请日：1998-03-09

申请人： Naganori Shirakata ,  Yasuo Harada ,  Hiroshi Hayashino

发明人： Naganori Shirakata ,  Yasuo Harada ,  Hiroshi Hayashino

IPC分类号： H04J100

CPC分类号： H04L27/2662 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2675

摘要： An OFDM receiving apparatus converts a received OFDM signal based on two sampling timing signals to detect reference symbols intermittently inserted in the OFDM signal. Based on the detected reference symbols, a frame synchronization is established. Further, clock components in the reference symbols are extracted, and compared with the sampling timing signals only in the reference symbol duration to obtain a phase error. Based on the phase error, the sampling timing signal is controlled to establish a bit-synchronization. For this purpose, at least two samplers, delayer, and phase error holder are provided.

摘要翻译： OFDM接收装置基于两个采样定时信号来转换接收的OFDM信号，以检测在OFDM信号中间歇地插入的参考符号。 基于检测到的参考符号，建立帧同步。 此外，提取参考符号中的时钟分量，并且仅在参考符号持续时间内与采样定时信号进行比较以获得相位误差。 基于相位误差，采样定时信号被控制以建立位同步。 为此，提供至少两个采样器，延迟器和相位误差保持器。

公开(公告)号：US09236931B2

公开(公告)日：2016-01-12

申请号：US13696819

申请日：2012-04-03

申请人： Yosuke Ukita ,  Hironori Nakae ,  Hiroshi Hayashino

发明人： Yosuke Ukita ,  Hironori Nakae ,  Hiroshi Hayashino

IPC分类号： H04B7/15 ,  H04W16/26 ,  H04B7/155

CPC分类号： H04B7/15 ,  H04B7/15528 ,  H04W16/26

摘要： A relay device according to the present invention includes: a receiving unit which receives a frame; a transmitting unit which transmits a frame; a frame determination unit which stores therein the first frame when the frame determination unit determines that the received frame is the first frame; a proxy ACK generation unit which generates a third frame which is a proxy frame of a second frame which is a frame to be transmitted from the receiving device, as a receipt acknowledgement to the first frame; and a communication control unit which: causes the transmitting unit to transmit the third frame; sets an extended active period in the inactive period subsequent to the active period; and transmits the first frame in the extended active period when the receiving unit does not receive the second frame within a predetermined period after reception of the first frame.

摘要翻译： 根据本发明的中继装置包括：接收单元，其接收帧; 发送单元，发送帧; 帧确定单元，其在帧确定单元确定接收到的帧是第一帧时在其中存储第一帧; 代理ACK生成单元，其生成作为要从所述接收装置发送的帧的第二帧的代理帧作为对所述第一帧的接收确认的第三帧; 以及通信控制单元，其使所述发送单元发送所述第三帧; 在活跃期之后的非活动期间设置延长的活动期; 并且在接收单元在接收到第一帧之后的预定时段内没有接收到第二帧时，在扩展活动期间内发送第一帧。

公开(公告)号：US08817677B2

公开(公告)日：2014-08-26

申请号：US13390549

申请日：2011-06-09

申请人： Yosuke Ukita ,  Hironori Nakae ,  Hiroshi Hayashino

发明人： Yosuke Ukita ,  Hironori Nakae ,  Hiroshi Hayashino

IPC分类号： H04B7/00

CPC分类号： H04W52/0216 ,  H02J2003/143 ,  H04W52/0258 ,  H04W52/0277 ,  Y02B70/3266 ,  Y02D70/142 ,  Y02D70/144 ,  Y04S20/242

摘要： An energy controller, as a communication device, transmits and receives data by transmitting a signal for establishing transmission and reception of the data to network-connected home appliances. The energy controller includes a power saving control unit that determines a transmission period such that the transmission period during which the signal is transmitted is increased as a power value difference increases, which is a value obtained by subtracting the total power consumption value of a power consumption appliance from available power supply value to the power consumption appliance including the network-connected home appliances; and a wireless communication IF for transmitting the signal containing the information indicating the transmission period to the network-connected home appliances in order to set the network-connected home appliances in an active state with a period according to the transmission period.

摘要翻译： 作为通信装置的能量控制器通过向网络连接的家用电器发送用于建立数据的发送和接收的信号来发送和接收数据。 能量控制器包括功率节省控制单元，其确定发送周期，使得发送信号的发送周期随着功率值差增加而增加，该功率值是通过减去功耗的总功耗值 设备从可用的电源值到包括网络连接的家用电器的功耗设备; 以及无线通信IF，用于将包含指示传输周期的信息的信号发送到网络连接的家用电器，以便将网络连接的家用电器按照传输周期的周期设置在活动状态。