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    • 41. 发明申请
    • Data transmission method and data reception method
    • 数据传输方法和数据接收方法
    • US20070121750A1
    • 2007-05-31
    • US10573044
    • 2005-03-09
    • Naganori ShirakataYasuo HaradaKoichiro TanakaTomohiro KimuraShuya HosokawaYoshio Urabe
    • Naganori ShirakataYasuo HaradaKoichiro TanakaTomohiro KimuraShuya HosokawaYoshio Urabe
    • H04L1/02
    • H04L27/2657H04L25/0204H04L27/2613H04L27/2675
    • In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to suppress a degradation in characteristics. Among symbols composed of a plurality of subcarriers orthognal to each other, the transfer apparatus uses, as a synchronization symbol, a symbol in which predetermined amplitudes and phases are assigned to a plurality of subcarriers spaced at predetermined frequency intervals. The synchronization symbol is divided into transmission antennas to generate a plurality of synchronization subsymbols, which are in turn simultaneously transmitted from a plurality of transmission antennas. A reception apparatus estimates a frequency error for each transfer path based on synchronization subsymbols included in signals received by a plurality of reception antennas, and based on the estimated frequency errors, corrects the received signals.
    • 在应用MIMO-OFDM的传送装置中,提供数据传输方法和数据接收方法,其中即使在传输路径之间存在频率误差变化的情况下,也可以提高反向传播系数函数的估计精度 ,从而可以抑制特性的劣化。 在由彼此正交的多个子载波组成的符号之中,传送装置使用将预定的幅度和相位分配给以预定频率间隔隔开的多个子载波的符号作为同步符号。 同步符号被分成发送天线以产生多个同步子符号,这些同步子符号又从多个发送天线同时发送。 接收装置基于由多个接收天线接收的信号中包含的同步子符号估计每个传送路径的频率误差,并且基于估计的频率误差来校正接收到的信号。
    • 47. 发明授权
    • Method of transmitting orthogonal frequency division multiplex signal,
and transmitter and receiver employed therefor
    • 发送正交频分复用信号的方法及其发射机和接收机
    • US5682376A
    • 1997-10-28
    • US572719
    • 1995-12-14
    • Hiroshi HayashinoYasuo HaradaTomohiro KimuraYasuhiro UnoHiroshi Oue
    • Hiroshi HayashinoYasuo HaradaTomohiro KimuraYasuhiro UnoHiroshi Oue
    • H04L27/26H04J11/00H04L27/28
    • H04L27/2607H04L27/2614
    • 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.
    • 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。
    • 48. 发明授权
    • System and method for acquiring and correction lifetime information within SA information when transitioning between power modes
    • 用于在功率模式之间转换时获取和校正SA信息内的生命周期信息的系统和方法
    • US09329624B2
    • 2016-05-03
    • US13451731
    • 2012-04-20
    • Tomohiro Kimura
    • Tomohiro Kimura
    • G06F1/32G06F1/00G06F1/14
    • G06F1/14G06F1/3206G06F1/3278G06F1/3293Y02D10/122Y02D10/157
    • A communication apparatus that is capable of enabling communication even when IPsec life time information is taken over. The communication apparatus is connected to a network via a network interface device and operates in a first power mode or a second power mode with less power consumption. A notification unit notifies the network interface device of IPsec life time information when shifting to the second power mode from the first power mode. A storage unit stores first time information showing time of shifting to the second power mode from the first power mode. An acquisition unit acquires the life time information from the network interface device when shifting to the first power mode from the second power mode. A correction unit corrects the life time information based on second time information showing time of shifting to the first power mode from the second power mode and the first time information.
    • 即使在IPsec生命周期信息被接管时也能够进行通信的通信装置。 通信设备经由网络接口​​设备连接到网络,并以较少功耗的第一功率模式或第二功率模式工作。 当从第一功率模式切换到第二功率模式时,通知单元向网络接口设备通知IPsec寿命信息。 存储单元从第一功率模式存储表示从第二功率模式转换到第二功率模式的时间的第一时间信息。 从第二功率模式切换到第一功率模式时,采集单元从网络接口装置获取寿命信息。 校正单元根据表示从第二功率模式切换到第一功率模式的时间的第二时间信息和第一时间信息来校正寿命信息。