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公开(公告)号：US07545870B1
公开(公告)日：2009-06-09
申请号：US10582765
申请日：2005-04-12
申请人： Naganori Shirakata , Yukihiro Omoto , Yoshio Urabe , Yasuo Harada
发明人： Naganori Shirakata , Yukihiro Omoto , Yoshio Urabe , Yasuo Harada
CPC分类号： H04L27/266 , H04L27/2613 , H04L27/2642 , H04L27/2659 , H04L27/2662 , H04L27/2675 , H04L27/2679 , H04L2027/0067 , H04L2027/0095
摘要： A reception device according to the present invention receives a transmission frame including a synchronization symbol string, having a synchronization symbol repeated multiple times, inserted before a data symbol string. The synchronization symbol is obtained by synthesizing a plurality of sub band symbols which are mutually orthogonal and having different carrier frequencies. The carrier frequencies of the sub band symbols are located at an equal predetermined frequency interval. The synchronization symbol includes a repeated synchronization pattern. The reception device detects a rough carrier frequency error from a phase difference of a synchronization pattern correlation value to correct the frequency, and then detects a residual frequency error from an inter-symbol phase difference of each sub band to correct the frequency. The reception device detects a sampling clock frequency error from an inter-sub band phase difference to correct the frequency. Thus, the demodulation error of the data symbol is reduced.
摘要翻译： 根据本发明的接收装置在数据符号串之前接收包括具有重复多次的同步符号的同步符号串的传输帧。 通过合成相互正交且具有不同载波频率的多个子带符号来获得同步符号。 子带符号的载波频率位于相等的预定频率间隔。 同步符号包括重复的同步模式。 接收装置根据同步模式相关值的相位差检测粗略载波频率误差，以校正频率，然后从每个子带的符号间相位差检测残留频率误差，以校正频率。 接收装置从子频带相位差检测采样时钟频率误差，以校正频率。 因此，减少数据符号的解调错误。
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12.发明授权公开(公告)号：US07251503B2
公开(公告)日：2007-07-31
申请号：US10533207
申请日：2004-10-12
IPC分类号： H04B1/38
CPC分类号： H04B7/0808
摘要： During all or part of a time period during which pattern signals are received, a diversity receiving apparatus allows a gain control section to fix the gain of a gain amplifier section, allows an antenna switching section to sequentially switch the selection of antennas during antenna switching periods which are synchronized with averaging periods, and determines an antenna to receive data contained in a packet, based on the levels of average powers measured by an averaging section on an averaging period-by-averaging period basis.
摘要翻译： 在接收图案信号的时间段的全部或部分期间，分集接收装置允许增益控制部分固定增益放大器部分的增益，允许天线切换部分在天线切换周期期间顺序切换天线的选择 并且根据平均化周期平均化周期的平均值测量的平均功率的电平，确定用于接收分组中包含的数据的天线。
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13.发明申请公开(公告)号：US20060104195A1
公开(公告)日：2006-05-18
申请号：US11312344
申请日：2005-12-21
IPC分类号： H04J11/00
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/006 , H04L5/0085 , H04L25/022 , H04L25/0226 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2675
摘要： In an OFDM transmission scheme, in order to compensate any frequency response variation in time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector 261 in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator 62 calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculator 63 calculates that for a second pilot symbol. Thereafter, a compensation vector calculator 64 calculates compensation vectors from the frequency responses of the transmission path for both of the first and second pilot symbols by linear approximation. A frequency response compensator 65 compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.
摘要翻译： 在OFDM传输方案中，为了补偿由于传输路径中的任何失真，与时间的流逝，频率漂移和相移失调的时间上的任何频率响应变化，并且为了改善解调特性， 在接收OFDM信号的接收机中的PS检测器261检测导频符号。 PS1 TPFR计算器62计算第一导频符号的传输路径的频率响应，而PS2 TPFR计算器63计算针对第二导频符号的频率响应。 此后，补偿矢量计算器64通过线性近似从第一和第二导频符号的传输路径的频率响应中计算补偿矢量。 频率响应补偿器65基于所计算的补偿向量来补偿数据符号中子载波的频率响应变化。
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公开(公告)号：US06993083B1
公开(公告)日：2006-01-31
申请号：US09597764
申请日：2000-06-20
申请人： Naganori Shirakata , Tomohiro Kimura , Koichiro Tanaka , Hideki Nakahara , Yasuo Harada , Shuya Hosokawa
发明人： Naganori Shirakata , Tomohiro Kimura , Koichiro Tanaka , Hideki Nakahara , Yasuo Harada , Shuya Hosokawa
IPC分类号： H04L7/04
CPC分类号： H04L27/2665 , H04L27/2662
摘要： An apparatus and method for OFDM demodulation establish symbol synchronization to minimize between-symbol interference even under an environment where multipath occurs.An incoming signal is an OFDM signal including a transmission symbol structured by a valid symbol period and a guard interval, and a predetermined synchronization symbol is included in the OFDM signal for every transmission frame. A correlator calculates how a signal generated by a synchronization symbol generator and the OFDM signal are correlated. A correlation calculator then calculates a correlation therefrom. An integrator integrates the calculated correlation by the guard interval. A timing determination device determines symbol timing from the integrated correlation. An FFT window generator outputs operation timing for Fourier transform from the determined symbol timing. Based on the signal outputted from the FFT window generator, the apparatus for OFDM demodulation extracts a signal in the valid symbol period from the transmission symbol for demodulation.
摘要翻译： 即使在发生多路径的环境下，用于OFDM解调的装置和方法建立符号同步以最小化符号间干扰。 输入信号是包括由有效符号周期和保护间隔构成的发送符号的OFDM信号，并且对于每个发送帧，在OFDM信号中包括预定的同步符号。 相关器计算由同步符号发生器和OFDM信号产生的信号的相关性。 然后，相关计算器从其计算相关性。 积分器将计算的相关性与保护间隔进行积分。 定时确定装置从综合相关确定符号定时。 FFT窗口生成器从所确定的符号定时输出用于傅里叶变换的操作定时。 基于从FFT窗口生成器输出的信号，OFDM解调装置从用于解调的发送符号中提取有效符号周期中的信号。
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公开(公告)号：US20090141836A1
公开(公告)日：2009-06-04
申请号：US10582765
申请日：2005-04-12
申请人： Naganori Shirakata , Yukihiro Omoto , Yoshio Urabe , Yasuo Harada
发明人： Naganori Shirakata , Yukihiro Omoto , Yoshio Urabe , Yasuo Harada
IPC分类号： H04L27/06
CPC分类号： H04L27/266 , H04L27/2613 , H04L27/2642 , H04L27/2659 , H04L27/2662 , H04L27/2675 , H04L27/2679 , H04L2027/0067 , H04L2027/0095
摘要： A reception device according to the present invention receives a transmission frame including a synchronization symbol string, having a synchronization symbol repeated multiple times, inserted before a data symbol string. The synchronization symbol is obtained by synthesizing a plurality of sub band symbols which are mutually orthogonal and having different carrier frequencies. The carrier frequencies of the sub band symbols are located at an equal predetermined frequency interval. The synchronization symbol includes a repeated synchronization pattern. The reception device detects a rough carrier frequency error from a phase difference of a synchronization pattern correlation value to correct the frequency, and then detects a residual frequency error from an inter-symbol phase difference of each sub band to correct the frequency. The reception device detects a sampling clock frequency error from an inter-sub band phase difference to correct the frequency. Thus, the demodulation error of the data symbol is reduced.
摘要翻译： 根据本发明的接收装置在数据符号串之前接收包括具有重复多次的同步符号的同步符号串的传输帧。 通过合成相互正交且具有不同载波频率的多个子带符号来获得同步符号。 子带符号的载波频率位于相等的预定频率间隔。 同步符号包括重复的同步模式。 接收装置根据同步模式相关值的相位差检测粗略载波频率误差，以校正频率，然后从每个子带的符号间相位差检测残留频率误差，以校正频率。 接收装置从子频带相位差检测采样时钟频率误差，以校正频率。 因此，减少数据符号的解调错误。
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16.发明授权公开(公告)号：US07027464B1
公开(公告)日：2006-04-11
申请号：US09627781
申请日：2000-07-28
IPC分类号： H04J3/06
CPC分类号： H04L5/0048 , H04L5/0007 , H04L5/006 , H04L5/0085 , H04L25/022 , H04L25/0226 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2675
摘要： In an OFDM transmission scheme, in order to compensate any frequency response variations time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculators calculates a frequency response of the transmission path for a second pilot symbol for a second pilot symbol. Thereafter, a compensation vector calculator calculates compensation vectors from the frequency responses of the transmission path for both of the first and second pilot symbols by linear approximation. A frequency response compensatory compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.
摘要翻译： 在OFDM传输方案中，为了补偿由于传输路径中的任何失真，随时间流逝，频率漂移和相移而失调的任何频率响应变化，并且为了提高解调特性， 在接收OFDM信号的接收机中的PS检测器检测导频符号。 PS1 TPFR计算器计算第一导频符号的传输路径的频率响应，而PS2 TPFR计算器计算用于第二导频符号的第二导频符号的传输路径的频率响应。 此后，补偿矢量计算器通过线性近似从第一和第二导频符号的传输路径的频率响应中计算补偿矢量。 频率响应补偿基于所计算的补偿向量来补偿数据符号中子载波的频率响应变化。
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17.发明申请公开(公告)号：US20060025090A1
公开(公告)日：2006-02-02
申请号：US10533207
申请日：2004-10-12
CPC分类号： H04B7/0808
摘要： During all or part of a time period during which pattern signals are received, a diversity receiving apparatus allows a gain control section to fix the gain of a gain amplifier section, allows an antenna switching section to sequentially switch the selection of antennas during antenna switching periods which are synchronized with averaging periods, and determines an antenna to receive data contained in a packet, based on the levels of average powers measured by an averaging section on an averaging period-by-averaging period basis.
摘要翻译： 在接收图案信号的时间段的全部或部分期间，分集接收装置允许增益控制部分固定增益放大器部分的增益，允许天线切换部分在天线切换周期期间顺序切换天线的选择 并且根据平均化周期平均化周期的平均值测量的平均功率的电平，确定用于接收分组中包含的数据的天线。
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公开(公告)号：US08693592B2
公开(公告)日：2014-04-08
申请号：US12597571
申请日：2008-03-10
IPC分类号： H04L27/06
CPC分类号： H03G3/3052 , H03G3/3068
摘要： An AGC unit starts a gain control of the variable gain amplifying unit when a bit saturation occurs in the digital baseband signal output from the A/D converting unit, and starts a gain control of the variable gain amplifying unit when a detection of STS from the digital baseband signal output from the A/D converting unit is started. The AGC unit performs the gain control of the variable gain amplifying unit once when the detection of STS is started, and performs the gain control of the variable gain amplifying unit twice when the bit saturation occurs, namely a larger number of times than when the detection of STS is started.
摘要翻译： 当从A / D转换单元输出的数字基带信号中产生位饱和时，AGC单元开始可变增益放大单元的增益控制，并且当从该A / D转换单元检测到STS时开始可变增益放大单元的增益控制 开始从A / D转换单元输出的数字基带信号。 当STS的检测开始时，AGC单元执行可变增益放大单元的增益控制，并且当发生位饱和时，执行可变增益放大单元的增益控制两次，即比检测时更大的次数 的STS已经开始了。
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公开(公告)号：US20130157589A1
公开(公告)日：2013-06-20
申请号：US13814914
申请日：2012-01-31
申请人： Naganori Shirakata , Tadashi Morita
发明人： Naganori Shirakata , Tadashi Morita
IPC分类号： H04B1/40
CPC分类号： H04B1/40 , H04L25/068 , H04L27/2636 , H04L27/32 , H04L27/367
摘要： A transmission-reception device includes a radio frequency section that performs a frequency conversion on a signal which is modulated using a single carrier transmission system, a correction coefficient multiplier that multiplies a frequency domain signal by a distortion correction coefficient in the frequency conversion of the radio frequency section to correct a distortion, a first transformer that converts a time domain signal into a frequency domain signal at a time of reception, and converts the frequency domain signal which is distortion-corrected by the correction coefficient multiplier into a time domain signal at a time of transmission, and a second transformer that converts a time domain signal into a frequency domain signal at a time of transmission, and converts the frequency domain signal which is distortion-corrected by the correction coefficient multiplier into a time domain signal at a time of reception.
摘要翻译： 发送接收装置包括对使用单载波传输系统调制的信号进行频率变换的射频部，将频域信号乘以无线电的频率变换中的失真校正系数的校正系数乘法器 频率部分，用于校正失真;第一变压器，其在接收时将时域信号转换为频域信号，并将由校正系数乘法器进行失真校正的频域信号转换为时域信号， 发送时间以及在发送时将时域信号变换为频域信号的第二变换器，将由校正系数乘法器进行了失真校正的频域信号转换为时域信号 接待处
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公开(公告)号：US08467726B2
公开(公告)日：2013-06-18
申请号：US13144565
申请日：2010-08-25
申请人： Naganori Shirakata , Koji Imamura , Yoshitaka Ohta
发明人： Naganori Shirakata , Koji Imamura , Yoshitaka Ohta
IPC分类号： H04B7/00
CPC分类号： A61B5/1118 , A61B5/0002 , A61B5/067 , A61B5/1126 , A61B2560/0209 , H04W4/21 , H04W8/22 , Y02D70/22
摘要： The communication device (10) which performs, when attached to the first region of the moving body, wireless communication with the communication partner device (20) attached to the second region of the moving body includes: a motion obtaining unit (11) which obtains motion information indicating a motion of at least one region of the moving body; a parameter determining unit (12) which determines a parameter corresponding to the motion of the region of the moving body indicated by the motion information obtained by the motion obtaining unit (11), using parameter information in which the motion and a parameter indicating a communication mode for successful wireless communication are associated with each other; and a wireless communication unit (13) which performs wireless communication with the communication partner device (20) according to the parameter determined by the parameter determining unit (12).
摘要翻译： 当连接到移动体的第一区域时，执行与附接到移动体的第二区域的通信对方设备（20）的无线通信的通信设备（10）包括：运动获取单元（11），其获得 指示移动体的至少一个区域的运动的运动信息; 参数确定单元，其使用参数信息来确定由运动获取单元（11）获得的运动信息所指示的与移动体的区域的运动相对应的参数，其中运动和参数指示通信 成功的无线通信模式相互关联; 以及根据由参数确定单元（12）确定的参数与通信对方设备（20）进行无线通信的无线通信单元（13）。
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