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    • 51. 发明授权
    • Communication device, a communication system and a communication control method
    • 通信设备,通信系统和通信控制方法
    • US09113425B2
    • 2015-08-18
    • US13576901
    • 2011-03-15
    • Takahiro Adachi
    • Takahiro Adachi
    • H04L27/00H04W52/26H04W24/00
    • H04W52/262H04L1/0003H04L1/0021H04L27/0008H04L27/0012H04W24/00
    • Provided is a communication device which can handle variation in transmission power accompanying switching of a modulation system.Included are: a receiving unit which receives a signal for which modulation according to a modulation system including a first modulation system and a second modulation system is performed based on modulation system designation information by an external transmission device, demodulates the received signal based on modulation system control information, and outputs the received data; a reception level measurement unit which measures a signal level of the signal, and outputs a reception level; an information extracting unit which outputs the modulation system control information based on the received data; a designation information output unit which outputs the modulation system designation information according to a modulation system switching threshold which was set based on a transmission power variation width which is a variation width when transmission power at a time when the signal is transmitted by the transmission device varies before and after switching of the modulation system between the first modulation system and the second modulation system by the transmission device; and a transmission unit which transmits the modulation system designation information to the transmission device.
    • 提供了一种能够处理伴随调制系统切换的传输功率变化的通信设备。 包括:接收单元,接收根据外部传输设备的调制系统指定信息执行根据包括第一调制系统和第二调制系统的调制系统的调制的信号的信号,基于调制系统对接收信号进行解调 控制信息,并输出接收到的数据; 接收电平测量单元,其测量信号的信号电平,并输出接收电平; 信息提取单元,其基于所接收的数据输出调制系统控制信息; 指定信息输出单元,其根据当发送装置的信号发送时的发送功率发生变化时的发送功率变化宽度为发送功率变化宽度而设定的调制方式切换阈值输出调制方式指定信息 在所述第一调制系统和所述第二调制系统之间通过所述传输装置切换所述调制系统之前和之后; 以及将调制系统指定信息发送到发送装置的发送单元。
    • 52. 发明授权
    • Clock synchronization circuit
    • 时钟同步电路
    • US07920664B2
    • 2011-04-05
    • US11864042
    • 2007-09-28
    • Takahiro Adachi
    • Takahiro Adachi
    • H04L7/00
    • H04L7/0029
    • A clock synchronization circuit includes a clock generation circuit generating a sampling clock for sampling a received signal from an output of a local oscillator, a phase error detection circuit finding a phase error between sampling timing of the sampling clock and ideal sampling timing, and a timing correction circuit finding a correction quantity to correct a frequency error between a frequency of the sampling clock and a frequency of the ideal sampling timing and the phase error every sampling timing of the sampling clock, and outputting a sampling value interpolated according to the found correction quantity.
    • 时钟同步电路包括:时钟生成电路,生成用于从本地振荡器的输出采样接收信号的采样时钟;相位误差检测电路,其求出采样时钟的采样定时与理想采样定时之间的相位误差;以及定时 校正电路,用于校正采样时钟的频率和理想采样定时的频率与采样时钟的每个采样定时的相位误差之间的频率误差的校正量,并输出根据所找到的校正量内插的采样值 。
    • 54. 发明授权
    • Circuit and method for compensating for nonliner distortion of power amplifier
    • 补偿功率放大器非线性失真的电路和方法
    • US07248644B2
    • 2007-07-24
    • US10774462
    • 2004-02-10
    • Takahiro AdachiMasahiro Kawai
    • Takahiro AdachiMasahiro Kawai
    • H04L25/49H03K7/00
    • H03F1/3294
    • A nonlinear distortion compensating circuit for compensating for a nonlinear distortion caused by a power amplifier for amplifying an input signal has a power calculator for calculating a power value of the input signal, an operating point setting unit for calculating an apparent power value from temperature information, supplied from an external source, representative of the measured temperature of the power amplifier and the power value calculated by the power calculator, based on a relationship, given beforehand to the operating point setting unit, between input vs. output characteristics of the power amplifier and the temperature of the power amplifier, an inverse characteristics calculator for calculating an inversion of the nonlinear distortion from inverse characteristics data, given beforehand to the inverse characteristics calculator, and a complex multiplier for adding the inversion calculated by the inverse characteristics calculator to the input signal.
    • 用于补偿由用于放大输入信号的功率放大器引起的非线性失真的非线性失真补偿电路具有用于计算输入信号的功率值的功率计算器,用于从温度信息计算视在功率值的工作点设定单元, 从外部源提供,代表功率放大器的测量温度和由功率计算器计算的功率值,基于事先给予工作点设定单元的关系,在功率放大器的输入与输出特性之间,以及 功率放大器的温度,用于从预测给予逆特性计算器的反特性数据计算非线性失真的反演的逆特性计算器,以及用于将由逆特性计算器计算的反演与输入信号相加的复数乘法器 。