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    • 3. 发明授权
    • Receiver, receiving method, filter circuit, and control method
    • 接收机,接收方式,滤波电路及控制方法
    • US07974363B2
    • 2011-07-05
    • US11869965
    • 2007-10-10
    • Hideki YokoshimaMasayoshi AbeYuya KondoYukitoshi Sanada
    • Hideki YokoshimaMasayoshi AbeYuya KondoYukitoshi Sanada
    • H03K9/00H04L27/00H03M1/12H03M3/00H03M1/66
    • H04B1/0021H04B1/28
    • A receiver supporting a plurality of radio communication systems having different specifications includes a setting unit, a clock generation circuit, a voltage-current conversion amplifier, a switch, integrators, an AD conversion circuit, and a feedback circuit. The setting unit sets a value suitable for a carrier frequency used in one selected radio communication system. The clock generation circuit generates a first clock having a first frequency and a second clock having a second frequency. The conversion amplifier converts an input voltage signal into a current signal. The switch switches between connection and disconnection modes in accordance with the first clock to output the current signal. Each integrator operates in accordance with the second clock and includes two or more switched capacitor circuits and an operational amplifier. The AD conversion circuit converts a signal supplied from the preceding integrator into digital form. The feedback circuit operates in accordance with the second clock.
    • 支持具有不同规格的多个无线电通信系统的接收机包括设置单元,时钟发生电路,电压 - 电流转换放大器,开关,积分器,AD转换电路和反馈电路。 设置单元设置适合于一个所选无线电通信系统中使用的载波频率的值。 时钟产生电路产生具有第一频率的第一时钟和具有第二频率的第二时钟。 转换放大器将输入电压信号转换为电流信号。 该开关根据第一个时钟在连接和断开模式之间切换以输出当前信号。 每个积分器根据第二时钟进行操作,并且包括两个或更多个开关电容器电路和运算放大器。 AD转换电路将从前一积分器提供的信号转换为数字形式。 反馈电路根据第二时钟进行工作。
    • 4. 发明授权
    • Wireless communicaton apparatus
    • 无线通信设备
    • US07957476B2
    • 2011-06-07
    • US11747676
    • 2007-05-11
    • Yukitoshi SanadaHideki YokoshimaMasayoshi AbeYuya KondoMamiko InamoriKazuyuki Saijo
    • Yukitoshi SanadaHideki YokoshimaMasayoshi AbeYuya KondoMamiko InamoriKazuyuki Saijo
    • H04K1/10H04L27/28
    • H04L27/2657H04L27/261H04L27/2663H04L27/2675
    • A wireless communication apparatus for receiving a packet formed of a signal modulated by OFDM includes the following elements. A band-pass filter extracts an OFDM signal of a desired band. A low-noise amplifier having a gain controlled according to a received-signal intensity amplifies the desired OFDM signal. A frequency converter down-converts the amplified OFDM signal into a baseband signal. An analog-digital converter converts the baseband signal into a digital signal. A first high-pass filter removes a DC offset from the baseband signal corresponding to a predetermined preamble portion of the packet. A frequency-offset estimator estimates a frequency offset from the sample signals constituting the baseband signal from which the DC offset has been removed by the first high-pass filter. A frequency-offset corrector removes the estimated frequency offset from the baseband signal. A demodulator demodulates subcarrier signals arranged in a frequency domain from the baseband signal compensated for the frequency offset.
    • 用于接收由OFDM调制的信号形成的分组的无线通信装置包括以下要素。 带通滤波器提取期望频带的OFDM信号。 具有根据接收信号强度控制的增益的低噪声放大器放大所需的OFDM信号。 变频器将放大的OFDM信号下变频为基带信号。 模拟数字转换器将基带信号转换为数字信号。 第一高通滤波器从对应于分组的预定前同步码部分的基带信号中去除DC偏移。 频率偏移估计器估计构成通过第一高通滤波器去除了DC偏移的基带信号的采样信号的频率偏移。 频偏校正器去除基带信号的估计频偏。 解调器解调从频率补偿的基带信号中排列在频域中的副载波信号。
    • 6. 发明申请
    • WIRELESS COMMUNICATON APPARATUS
    • 无线通信设备
    • US20080089443A1
    • 2008-04-17
    • US11747676
    • 2007-05-11
    • Yukitoshi SanadaHideki YokoshimaMasayoshi AbeYuya KondoMamiko InamoriKazuyuki Saijo
    • Yukitoshi SanadaHideki YokoshimaMasayoshi AbeYuya KondoMamiko InamoriKazuyuki Saijo
    • H04J11/00
    • H04L27/2657H04L27/261H04L27/2663H04L27/2675
    • A wireless communication apparatus for receiving a packet formed of a signal modulated by OFDM includes the following elements. A band-pass filter extracts an OFDM signal of a desired band. A low-noise amplifier having a gain controlled according to a received-signal intensity amplifies the desired OFDM signal. A frequency converter down-converts the amplified OFDM signal into a baseband signal. An analog-digital converter converts the baseband signal into a digital signal. A first high-pass filter removes a DC offset from the baseband signal corresponding to a predetermined preamble portion of the packet. A frequency-offset estimator estimates a frequency offset from the sample signals constituting the baseband signal from which the DC offset has been removed by the first high-pass filter. A frequency-offset corrector removes the estimated frequency offset from the baseband signal. A demodulator demodulates subcarrier signals arranged in a frequency domain from the baseband signal compensated for the frequency offset.
    • 用于接收由OFDM调制的信号形成的分组的无线通信装置包括以下要素。 带通滤波器提取期望频带的OFDM信号。 具有根据接收信号强度控制的增益的低噪声放大器放大所需的OFDM信号。 变频器将放大的OFDM信号下变频为基带信号。 模拟数字转换器将基带信号转换为数字信号。 第一高通滤波器从对应于分组的预定前同步码部分的基带信号中去除DC偏移。 频率偏移估计器估计构成通过第一高通滤波器去除了DC偏移的基带信号的采样信号的频率偏移。 频偏校正器去除基带信号的估计频偏。 解调器解调从频率补偿的基带信号中排列在频域中的副载波信号。