公开(公告)号：US07957476B2

公开(公告)日：2011-06-07

申请号：US11747676

申请日：2007-05-11

申请人： Yukitoshi Sanada ,  Hideki Yokoshima ,  Masayoshi Abe ,  Yuya Kondo ,  Mamiko Inamori ,  Kazuyuki Saijo

发明人： Yukitoshi Sanada ,  Hideki Yokoshima ,  Masayoshi Abe ,  Yuya Kondo ,  Mamiko Inamori ,  Kazuyuki Saijo

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2657 ,  H04L27/261 ,  H04L27/2663 ,  H04L27/2675

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20080089443A1

公开(公告)日：2008-04-17

申请号：US11747676

申请日：2007-05-11

申请人： Yukitoshi Sanada ,  Hideki Yokoshima ,  Masayoshi Abe ,  Yuya Kondo ,  Mamiko Inamori ,  Kazuyuki Saijo

发明人： Yukitoshi Sanada ,  Hideki Yokoshima ,  Masayoshi Abe ,  Yuya Kondo ,  Mamiko Inamori ,  Kazuyuki Saijo

IPC分类号： H04J11/00

CPC分类号： H04L27/2657 ,  H04L27/261 ,  H04L27/2663 ,  H04L27/2675

摘要： 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.

摘要翻译： 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。

公开(公告)号：US07397872B2

公开(公告)日：2008-07-08

申请号：US10362295

申请日：2002-06-25

申请人： Kenji Komori ,  Masataka Wakamatsu ,  Hideaki Sato ,  Takashi Usui ,  Kazuyuki Saijo ,  Shinichi Tanabe ,  Hideo Morohashi ,  Kazuhiro Fujimura

发明人： Kenji Komori ,  Masataka Wakamatsu ,  Hideaki Sato ,  Takashi Usui ,  Kazuyuki Saijo ,  Shinichi Tanabe ,  Hideo Morohashi ,  Kazuhiro Fujimura

IPC分类号： H04L27/08 ,  H04B7/00

CPC分类号： H03G3/3078 ,  H03G3/3052 ,  H04L27/2647

摘要： An automatic gain control circuit able to perform high speed and correct level acquisition, able to prevent occurrence of error, and able to prevent a crash of the system. An amplification gain controller outputs a gain control signal to an automatic gain control amplifier to amplify the received signal with maximum value when receiving a burst detection trigger signal. A second gain control signal based on the detected reception signal power is calculated when receiving a first burst synchronization detection signal; and this second gain control signal is output to the automatic gain control amplifier. A received digital signal is amplified with the second gain and integrated to find the reception signal power, from which a third gain control signal is calculated and outputted to the automatic gain control amplifier to amplify the received signal with this third gain.

摘要翻译： 一种自动增益控制电路，能够执行高速和正确的电平采集，能够防止发生错误，并能够防止系统崩溃。 放大增益控制器将增益控制信号输出到自动增益控制放大器，以在接收到脉冲串检测触发信号时以最大值放大接收信号。 当接收到第一突发同步检测信号时，计算出基于检测到的接收信号功率的第二增益控制信号; 并且该第二增益控制信号被输出到自动增益控制放大器。 接收到的数字信号用第二增益放大并被积分以找出接收信号功率，由此计算第三增益控制信号并将其输出到自动增益控制放大器，以用该第三增益放大接收信号。

公开(公告)号：US07190216B2

公开(公告)日：2007-03-13

申请号：US10525494

申请日：2003-08-22

申请人： Kazuyuki Saijo ,  Moonjae Jeong

发明人： Kazuyuki Saijo ,  Moonjae Jeong

IPC分类号： H03D3/00

CPC分类号： H03D3/006 ,  H04L27/2276

摘要： In a sampling block 40a-1, an intermediate frequency signal RIFs is sampled at a frequency of the intermediate frequency signal RIFs multiplied by “1/(m+0.25)” or “1/(m+0.75)” (m: 0 or natural number), to generate signals having phase differences “0”, “π/2”, “π”, and “3π/2”. A polarity adjustment block 40a-2 matches a polarity of the signal having phase difference “π” with that of the signal having phase difference “0”. Further, it matches a polarity of the signal having phase difference “3π/2” with that of the signal having phase difference “π/2”. In a signal synthesis block 40a-3, the signal with phase difference “0” and the signal with phase difference “π” having phase difference “π” from each other are synthesized and held to be output as a demodulated signal PI. Further, the signal with phase difference “π/2” and the signal with phase difference “3π/2” having phase difference “π” from each other are synthesized and held to be output as a demodulated signal PQ. It is possible to provide a demodulation circuit and a receiving set that can easily obtain a good demodulated signal by a simple configuration.

摘要翻译： 在采样块40a-1中，以中频频率信号RIF乘以“1 /（m + 0.25）”或“1 /（m + 0.75）”（m：0）的频率对中频信号RIF进行采样 或自然数），以产生具有相位差“0”，“pi / 2”，“pi”和“3pi / 2”的信号。 极性调整块40a-2与具有相位差“π”的信号的极性与具有相位差“0”的信号的极性匹配。 此外，它与具有相位差“3pi / 2”的信号的极性与具有相位差“pi / 2”的信号的极性匹配。 在信号合成块40a-3中，合成并保持具有相位差“0”的信号和具有相位差“pi”的相位差“pi”的信号作为解调信号PI输出。 此外，合成并保持具有相位差“pi / 2”的信号和具有相位差“pi”的相位差“3pi / 2”的信号作为解调信号PQ输出。 可以通过简单的配置提供可以容易地获得良好的解调信号的解调电路和接收装置。

公开(公告)号：US20050285669A1

公开(公告)日：2005-12-29

申请号：US10525494

申请日：2003-08-22

申请人： Kazuyuki Saijo ,  Moonjae Jeong

发明人： Kazuyuki Saijo ,  Moonjae Jeong

IPC分类号： H04L27/38 ,  H03D3/00 ,  H04L27/22 ,  H04L27/227 ,  H03K9/00

CPC分类号： H03D3/006 ,  H04L27/2276

摘要： In a sampling block 40a-1, an intermediate frequency signal RIFs is sampled at a frequency of the intermediate frequency signal RIFs multiplied by “1/(m+0.25)” or “1/(m+0.75)” (m: 0 or natural number), to generate signals having phase differences “0”, “π/2”, “π”, and “3π/2”. A polarity adjustment block 40a-2 matches a polarity of the signal having phase difference “π” with that of the signal having phase difference “0”. Further, it matches a polarity of the signal having phase difference “3π/2” with that of the signal having phase difference “π/2”. In a signal synthesis block 40a-3, the signal with phase difference “π” and the signal with phase difference “π” having phase difference “π” from each other are synthesized and held to be output as a demodulated signal PI. Further, the signal with phase difference “π/2” and the signal with phase difference “3π/2” having phase difference “π” from each other are synthesized and held to be output as a demodulated signal PQ. It is possible to provide a demodulation circuit and a receiving set that can easily obtain a good demodulated signal by a simple configuration.

摘要翻译： 在采样块40a-1中，以中频频率信号RIF乘以“1 /（m + 0.25）”或“1 /（m + 0.75）”（m：0）的频率对中频信号RIF进行采样 或自然数），以产生具有相位差“0”，“pi / 2”，“pi”和“3pi / 2”的信号。 极性调整块40a-2与具有相位差“π”的信号的极性与具有相位差“0”的信号的极性匹配。 此外，它与具有相位差“3pi / 2”的信号的极性与具有相位差“pi / 2”的信号的极性匹配。 在信号合成块40a-3中，合成具有相位差“pi”的信号和具有彼此具有相位差“pi”的相位差“pi”的信号作为解调信号PI被输出。 此外，合成并保持具有相位差“pi / 2”的信号和具有相位差“pi”的相位差“3pi / 2”的信号作为解调信号PQ输出。 可以通过简单的配置提供可以容易地获得良好的解调信号的解调电路和接收装置。

公开(公告)号：US5625321A

公开(公告)日：1997-04-29

申请号：US547120

申请日：1995-10-23

申请人： Kazuji Sasaki ,  Masayuki Katakura ,  Kazuyuki Saijo

发明人： Kazuji Sasaki ,  Masayuki Katakura ,  Kazuyuki Saijo

IPC分类号： H03G3/20 ,  H03F3/62 ,  H03G3/30 ,  H04B1/16 ,  H03F3/68

CPC分类号： H03F3/62 ,  H03G3/3052

摘要： In a variable gain amplifier apparatus, wide input dynamic range can be secured and low noise characteristic can be obtained by employing first and second variable gain amplifiers have different noise characteristics and different saturation input levels and receive a same input signal. Output signals of the first and second variable gain amplifiers are added to each other to provide an output signal of the variable gain amplifier apparatus. Desired noise characteristic and saturation input level characteristic of the variable gain amplifier apparatus can be obtained by selecting the noise characteristics and the saturation input levels of the first and second variable gain amplifiers appropriately. This allows the variable gain amplifier apparatus to have a wide input dynamic range and low noise characteristic.

摘要翻译： 在可变增益放大器装置中，通过采用具有不同噪声特性和不同饱和输​​入电平的第一和第二可变增益放大器，并且接收相同的输入信号，可以确保宽的输入动态范围并且可以获得低噪声特性。 将第一和第二可变增益放大器的输出信号彼此相加以提供可变增益放大器装置的输出信号。 可以通过适当地选择第一和第二可变增益放大器的噪声特性和饱和输入电平来获得可变增益放大器装置的期望噪声特性和饱和输入电平特性。 这允许可变增益放大器装置具有宽的输入动态范围和低噪声特性。