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1. 发明授权

US06618352B1 Modulator, demodulator, and transmission system for use in OFDM transmission 有权
标题翻译：用于OFDM传输的调制器，解调器和传输系统
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。

2. 发明授权

US06944122B2 Modulator, demodulator, and transmission system for use in OFDM transmission 有权
标题翻译：用于OFDM传输的调制器，解调器和传输系统
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。

3. 发明授权

US06169751A OFDM receiving apparatus 失效
标题翻译： OFDM接收装置
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。

4. 发明申请

US20100260084A1 WIRELESS COMMUNICATION APPARATUS, TERMINAL, SYSTEM, PROGRAM 有权
标题翻译：无线通信设备，终端，系统，程序
公开(公告)号：US20100260084A1
公开(公告)日：2010-10-14
申请号：US12675588
申请日：2009-06-29
申请人： Koji Imamura , Hiroshi Hayashino , Naganori Shirakata
发明人： Koji Imamura , Hiroshi Hayashino , Naganori Shirakata
IPC分类号： H04W72/04 , H04W52/02
CPC分类号： H04W52/0216 , H04W76/28 , Y02D70/142 , Y02D70/144 , Y02D70/166 , Y02D70/168
摘要： Provided is a compact and low power consumption wireless communication system, including a base station and communication terminals, in which power consumption of the communication terminal is reduced. The base station alternately sets an active interval during which predetermined data communication is performed, and an inactive interval during which the predetermined data communication is not performed. During the active interval, a beacon including information indicating a start timing of a subsequent active interval is transmitted and received. During the inactive interval, a sub-beacon including information providing notice of a transmission timing of a subsequent beacon is transmitted and received. When receiving the sub-beacon, the communication terminal obtains the transmission timing of the subsequent beacon and stops a supply of power to an unit related to a wireless communication function until the transmission timing.
摘要翻译：提供了一种紧凑且低功耗的无线通信系统，其包括基站和通信终端，其中通信终端的功耗被降低。基站交替地设置执行预定数据通信的活动间隔，以及不执行预定数据通信的无效间隔。在活动间隔期间，发送并接收包括指示后续活动间隔的开始定时的信息的信标。在非活动间隔期间，发送并接收包括提供通知后续信标的发送定时的信息的子信标。当接收到子信标时，通信终端获得后续信标的发送定时，并停止向与无线通信功能相关的单元的电力供应直到发送定时。

5. 发明授权

US08515477B2 Base station and communication method 有权
标题翻译：基站和通信方式
公开(公告)号：US08515477B2
公开(公告)日：2013-08-20
申请号：US12673885
申请日：2009-06-26
申请人： Naotake Yamamoto , Hiroshi Hayashino , Hironori Nakae , Naganori Shirakata
发明人： Naotake Yamamoto , Hiroshi Hayashino , Hironori Nakae , Naganori Shirakata
IPC分类号： H04W72/08
CPC分类号： H04W72/085 , H04L1/1893 , H04L5/06 , H04W28/04
摘要： A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication terminals to retransmit the data signals using the assigned frequency channels.
摘要翻译：基站包括：估计部，估计用于通信的每个频道的传输条件; 接收部分，通过任何频道从每个通信终端接收数据信号; 测量部分，测量每个频道的接收数据信号的接收信号功率; 确定部，为每个频道确定所接收的数据信号是否无误地解调; 以及控制部，通过所述估计部分将被估计为处于良好发送状态的频率信道分配给所述数据信号被确定为不被所述确定部无错误地解调的通信终端，使得更好的发送条件下的频道为优先分配给具有由检测部检测到的较大接收信号功率的通信终端，以及发送请求通信终端的重传请求信号，以使用所分配的频率信道重传数据信号。

6. 发明申请

US20110086661A1 BASE STATION AND COMMUNICATION METHOD 有权
标题翻译：基站和通信方法
公开(公告)号：US20110086661A1
公开(公告)日：2011-04-14
申请号：US12673885
申请日：2009-06-26
申请人： Naotake Yamamoto , Hiroshi Hayashino , Hironori Nakae , Naganori Shirakata
发明人： Naotake Yamamoto , Hiroshi Hayashino , Hironori Nakae , Naganori Shirakata
IPC分类号： H04W72/08
CPC分类号： H04W72/085 , H04L1/1893 , H04L5/06 , H04W28/04
摘要： A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication terminals to retransmit the data signals using the assigned frequency channels.
摘要翻译：基站包括：估计部，估计用于通信的每个频道的传输条件; 接收部分，通过任何频道从每个通信终端接收数据信号; 测量部分，测量每个频道的接收数据信号的接收信号功率; 确定部，为每个频道确定所接收的数据信号是否无误地解调; 以及控制部，通过所述估计部分将被估计为处于良好发送状态的频率信道分配给所述数据信号被确定为不被所述确定部无错误地解调的通信终端，使得更好的发送条件下的频率信道为优先分配给具有由检测部检测到的较大接收信号功率的通信终端，以及发送请求通信终端的重传请求信号，以使用所分配的频率信道重传数据信号。

7. 发明授权

US08295218B2 Wireless communication apparatus, terminal, system, program 有权
标题翻译：无线通信装置，终端，系统，程序
公开(公告)号：US08295218B2
公开(公告)日：2012-10-23
申请号：US12675588
申请日：2009-06-29
申请人： Koji Imamura , Hiroshi Hayashino , Naganori Shirakata
发明人： Koji Imamura , Hiroshi Hayashino , Naganori Shirakata
IPC分类号： G08C17/00 , H04W4/00 , H04B7/00
CPC分类号： H04W52/0216 , H04W76/28 , Y02D70/142 , Y02D70/144 , Y02D70/166 , Y02D70/168
摘要： Provided is a compact and low power consumption wireless communication system, including a base station and communication terminals, in which power consumption of the communication terminal is reduced. The base station alternately sets an active interval during which predetermined data communication is performed, and an inactive interval during which the predetermined data communication is not performed. During the active interval, a beacon including information indicating a start timing of a subsequent active interval is transmitted and received. During the inactive interval, a sub-beacon including information providing notice of a transmission timing of a subsequent beacon is transmitted and received. When receiving the sub-beacon, the communication terminal obtains the transmission timing of the subsequent beacon and stops a supply of power to an unit related to a wireless communication function until the transmission timing.
摘要翻译：提供了一种紧凑且低功耗的无线通信系统，其包括基站和通信终端，其中通信终端的功耗被降低。基站交替地设置执行预定数据通信的活动间隔，以及不执行预定数据通信的无效间隔。在活动间隔期间，发送并接收包括指示后续活动间隔的开始定时的信息的信标。在非活动间隔期间，发送并接收包括提供通知后续信标的发送定时的信息的子信标。当接收到子信标时，通信终端获得后续信标的发送定时，并停止向与无线通信功能相关的单元的电力供应直到发送定时。

8. 发明授权

US07085233B2 Communications control method 有权
标题翻译：通讯控制方式
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。

9. 发明授权

US5771223A Method of receiving orthogonal frequency division multiplexing signal and receiver thereof 失效
标题翻译：正交频分复用信号的接收方法及其接收机
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。

10. 发明授权

US5774450A Method of transmitting orthogonal frequency division multiplexing signal and receiver thereof 失效
标题翻译：发送正交频分复用信号的方法及其接收机
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。

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