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公开(公告)号：US07158475B1
公开(公告)日：2007-01-02
申请号：US09936337
申请日：2000-03-10
申请人： Yasunari Ikeda , Tamotsu Ikeda , Takahiro Okada
发明人： Yasunari Ikeda , Tamotsu Ikeda , Takahiro Okada
CPC分类号： H04L27/2626
摘要： Influence from an adjacent signal is prevented even if a guard band is not provided.A phase comparison unit 21 compares a reference window signal input to a PLL circuit 4 and a window signal supplied from a frequency division circuit 22 and outputs the comparison result to an LPF 23. The LPF 23 extracts a low frequency component from the input signal and outputs the same to a voltage controlled oscillator 24. The signal output from the voltage controlled oscillator 24 is supplied as a clock to units of an OFDM modulation circuit 2 and, at the same time, supplied to the frequency division circuit 22. The frequency division circuit 22 divides the frequency of the supplied signal to thereby generate a new window signal and supplies the same to an IFFT unit 13. Further, the generated window signal is supplied to a PLL circuit 5. The PLL circuit 5 generates a clock for controlling a frequency modulation circuit 3 based on the supplied window signal.
摘要翻译： 即使没有提供保护带，也防止相邻信号的影响。 相位比较单元21比较输入到PLL电路4的参考窗口信号和从分频电路22提供的窗口信号，并将比较结果输出到LPF 23。 LPF23从输入信号中提取低频分量，并将其输出到压控振荡器24。 从压控振荡器24输出的信号作为时钟被提供给OFDM调制电路2的单元，同时被提供给分频电路22。 分频电路22对所提供的信号的频率进行分频，从而生成新的窗口信号，并将其提供给IFFT单元13。 此外，生成的窗口信号被提供给PLL电路5。 PLL电路5基于所提供的窗口信号产生用于控制频率调制电路3的时钟。
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公开(公告)号：US07075949B2
公开(公告)日：2006-07-11
申请号：US09834282
申请日：2001-04-12
CPC分类号： H04L27/2656 , H04L5/023
摘要： The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.
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公开(公告)号：US06215819B1
公开(公告)日：2001-04-10
申请号：US09069702
申请日：1998-04-29
IPC分类号： H04B166
CPC分类号： H04L27/2657 , H04L27/2662 , H04L27/2679
摘要： An apparatus and method for receiving an OFDM signal arranged to accurately reproduce a clock signal. I channel data and Q channel data are differential-demodulated by a differential demodulation circuit and are supplied to a ROM. The ROM reads out an intersymbol phase change amount corresponding to the differential-demodulated data and supplies it to a gate circuit. The gate circuit extracts only a component corresponding to each of pilot signals in the input data, and supplies the extracted component to a sign inversion circuit and to a selector. The selector selects the output from the gate circuit if the pilot signal is a positive frequency value or the output from the sign inversion circuit if the pilot signal is a negative frequency value, and supplies the obtained value to a cumulative addition circuit. The cumulative addition circuit performs cumulative addition of values output from the selector over a symbol period, and outputs the addition result to an average circuit. The average circuit averages the output from the cumulative addition circuit and controls the frequency of oscillation of a clock signal according to a value obtained by the average circuit.
摘要翻译： 一种接收正交再现时钟信号的OFDM信号的装置和方法。 I通道数据和Q通道数据由差分解调电路进行差分解调并提供给ROM。 ROM读出对应于差分解调数据的符号间相位变化量，并将其提供给门电路。 门电路仅提取与输入数据中的每个导频信号相对应的分量，并将所提取的分量提供给符号反转电路和选择器。 如果导频信号是正频率值，则选择器选择来自门电路的输出，或者如果导频信号是负频率值，则从符号反转电路输出，并将获得的值提供给累积加法电路。 累积加法电路在符号周期执行从选择器输出的值的累加，并将相加结果输出到平均电路。 平均电路对累积加法电路的输出进行平均，并根据平均电路获得的值来控制时钟信号的振荡频率。
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公开(公告)号：US07170850B2
公开(公告)日：2007-01-30
申请号：US11214158
申请日：2005-08-29
申请人： Takahiro Okada , Yasunari Ikeda
发明人： Takahiro Okada , Yasunari Ikeda
IPC分类号： H04J11/00
CPC分类号： H04L27/2626 , H04L27/2602
摘要： A transmission apparatus which prevents adversely affects from an adjacent channel even without provision of a guard band. An information sequence 1 input to a mapping unit 21-1 of the transmission apparatus is mapped onto predetermined signal points by QAM modulation, etc. and output to a frequency converter 22-1. The frequency converter 22-1 converts the frequency according to a center frequency of an input signal and outputs the result to a multiplexer 23. The other data series are processed in the same way as the data series 1 are output to the multiplexer 23. The multiplexer 23 multiplexes a plurality of input signals, while an IFFT processor 24 performs an inverse Fourier transform on the multiplexed signals all at once. The inverse Fourier transformed signal is quadrature-modulated by a quadrature modulator 26, converted to the RF band signal by the frequency converter 28, and transmitted from an antenna 30.
摘要翻译： 即使没有提供保护带，也能够防止相邻信道的不利影响的发送装置。 输入到发送装置的映射单元21-1的信息序列1通过QAM调制等映射到预定的信号点上，并输出到频率转换器22-1。 频率转换器22-1根据输入信号的中心频率转换频率，并将结果输出到多路复用器23。 以与将数据序列1输出到多路复用器23相同的方式处理其他数据序列。 多路复用器23复用多个输入信号，而IFFT处理器24一次对多路复用信号进行傅立叶逆变换。 逆傅里叶变换信号由正交调制器26进行正交调制，由频率转换器28转换成RF频带信号，并从天线30发送。
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公开(公告)号：US20060002288A1
公开(公告)日：2006-01-05
申请号：US11214158
申请日：2005-08-29
申请人： Takahiro Okada , Yasunari Ikeda
发明人： Takahiro Okada , Yasunari Ikeda
IPC分类号： H04J11/00
CPC分类号： H04L27/2626 , H04L27/2602
摘要： A transmission apparatus which prevents adversely affects from an adjacent channel even without provision of a guard band. An information sequence 1 input to a mapping unit 21-1 of the transmission apparatus is mapped onto predetermined signal points by QAM modulation, etc. and output to a frequency converter 22-1. The frequency converter 22-1 converts the frequency according to a center frequency of an input signal and outputs the result to a multiplexer 23. The other data series are processed in the same way as the data series 1 are output to the multiplexer 23. The multiplexer 23 multiplexes a plurality of input signals, while an IFFT processor 24 performs an inverse Fourier transform on the multiplexed signals all at once. The inverse Fourier transformed signal is quadrature-modulated by a quadrature modulator 26, converted to the RF band signal by the frequency converter 28, and transmitted from an antenna 30.
摘要翻译： 即使没有提供保护带，也能够防止相邻信道的不利影响的发送装置。 输入到发送装置的映射单元21-1的信息序列1通过QAM调制等映射到预定的信号点上，并输出到频率转换器22-1。 频率转换器22-1根据输入信号的中心频率转换频率，并将结果输出到多路复用器23。 以与将数据序列1输出到多路复用器23相同的方式处理其他数据序列。 多路复用器23复用多个输入信号，而IFFT处理器24一次对多路复用信号进行傅立叶逆变换。 逆傅里叶变换信号由正交调制器26进行正交调制，由频率转换器28转换成RF频带信号，并从天线30发送。
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公开(公告)号：US06980509B1
公开(公告)日：2005-12-27
申请号：US09914716
申请日：2000-03-06
申请人： Takahiro Okada , Yasunari Ikeda
发明人： Takahiro Okada , Yasunari Ikeda
IPC分类号： H04J11/00 , H04B1/04 , H04J20060101 , H04L5/06
CPC分类号： H04L5/06
摘要： A transmission apparatus which prevents adversely affects from an adjacent channel even without provision of a guard band. An information sequence 1 input to a mapping unit 21-1 of the transmission apparatus is mapped onto predetermined signal points by QAM modulation, etc. and output to a frequency converter 22-1. The frequency converter 22-1 converts the frequency according to a center frequency of an input signal and outputs the result to a multiplexer 23. The other data series are processed in the same way as the data series 1 are output to the multiplexer 23. The multiplexer 23 multiplexes a plurality of input signals, while an IFFT processor 24 performs an inverse Fourier transform on the multiplexed signals all at once. The inverse Fourier transformed signal is quadrature-modulated by a quadrature modulator 26, converted to the RF band signal by the frequency converter 28, and transmitted from an antenna 30.
摘要翻译： 即使没有提供保护带，也能够防止相邻信道的不利影响的发送装置。 输入到发送装置的映射单元21-1的信息序列1通过QAM调制等映射到预定的信号点上，并输出到频率转换器22-1。 频率转换器22-1根据输入信号的中心频率转换频率，并将结果输出到多路复用器23。 以与将数据序列1输出到多路复用器23相同的方式处理其他数据序列。 多路复用器23复用多个输入信号，而IFFT处理器24一次对多路复用信号进行傅立叶逆变换。 逆傅里叶变换信号由正交调制器26进行正交调制，由频率转换器28转换成RF频带信号，并从天线30发送。
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公开(公告)号：US20050169166A1
公开(公告)日：2005-08-04
申请号：US11089810
申请日：2005-03-25
CPC分类号： H04L27/2656 , H04L5/023
摘要： The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.
摘要翻译： 切换通道所需的时间可以大大减少。 当通过具有OFDM系统的多个信息信道广播信号时，多个信息信道在频率上被多路复用，并且对于所连接的发送集中地进行IFFT调制，而不是独立地对多个信道进行OFDM调制以进行传输。 通过这种安排，提高了频率利用的效率。 根据本发明，为了连接传输的目的，为每个信息信道同步OFDM帧。 然后，OFDM接收机可以切换用于信号接收的信道，保持帧同步信号。
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公开(公告)号：US06856590B2
公开(公告)日：2005-02-15
申请号：US09833996
申请日：2001-04-12
CPC分类号： H04L5/06
摘要： The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.
摘要翻译： 切换通道所需的时间可以大大减少。 当通过具有OFDM系统的多个信息信道广播信号时，多个信息信道在频率上被多路复用，并且对于所连接的发送集中地进行IFFT调制，而不是独立地对多个信道进行OFDM调制以进行传输。 通过这种安排，提高了频率利用的效率。 根据本发明，为了连接传输的目的，为每个信息信道同步OFDM帧。 然后，OFDM接收机可以切换用于信号接收的信道，保持帧同步信号。
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9.发明授权Data receiver, data transmission system, and data transmitting method therefor 失效数据接收机，数据传输系统及其数据传输方法公开(公告)号：US06681363B1
公开(公告)日：2004-01-20
申请号：US09647966
申请日：2000-12-12
IPC分类号： H03M1337
CPC分类号： H04L1/0057 , G11B20/10 , G11B2020/10944 , H03M13/1515 , H03M13/29 , H03M13/2909 , H03M13/35 , H04L1/0017 , H04L1/0045 , H04L1/005 , H04L1/0066
摘要： A data transmission system which allows received data to be decoded and reproduced in real time by simple decoding and which allows signal reproduction and recording by highly reliable error-correcting decoding, wherein a transmitter encodes transmission data by an error-correcting code enabling control of the error-correcting characteristic and the real-time characteristic at the receiving side and transmits it through a transmission line and a receiver 2a demodulates the received data by a demodulation circuit 102, decodes it by a simple decoding circuit 104 and simultaneously stores it in a storage circuit 110, demultiplexes the decoded data 105a by a demultiplexing circuit 106, and reproduces it by a reproduction circuit 123 in a form for viewing and listening by a user. A control circuit 122 obtains identification information related to the data to be recorded according to a record instruction 125, specifies the start and the end of the data to be reproduced to the storage circuit 110 and reads it, applies error-correcting decoding to it by an error-correcting decoding circuit 111, and records the demultiplexed information data 114 or data 116 reproduced by the source reproduction circuit 115 by a recording circuit 124.
摘要翻译： 一种数据传输系统，其允许通过简单解码实时解码和再现接收的数据，并且允许通过高度可靠的纠错解码进行信号再现和记录，其中发送器通过纠错码对发送数据进行编码，从而能够控制 接收侧的误差校正特性和实时特性，并通过传输线发送，接收机2a通过解调电路102对接收到的数据进行解调，由简单的解码电路104进行解码，同时将其存储在存储器 电路110通过解复用电路106对解码数据105a进行解复用，并且以再现电路123以用户观看和收听的形式再现它。 控制电路122根据记录指令125获得与要记录的数据相关的识别信息，将要再现的数据的开始和结束指定到存储电路110并读取，并通过读出来对其进行纠错解码 纠错解码电路111，并通过记录电路124记录由源再现电路115再现的解复用信息数据114或数据116。
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10.发明授权Orthogonal function generating circuit and orthogonal function generating method 失效正交函数生成电路和正交函数生成方法
公开(公告)号：US5805484A
公开(公告)日：1998-09-08
申请号：US608611
申请日：1996-02-29
申请人： Yasunari Ikeda , Tamotsu Ikeda , Takahiro Okada
发明人： Yasunari Ikeda , Tamotsu Ikeda , Takahiro Okada
CPC分类号： G06F17/142
摘要： In an orthogonal function generating circuit, orthogonal functions are generated with high precision by a small-scale circuit. The circuit uses an orthogonal transformation between time domain digital data and frequency domain digital data to obtain one of the time domain digital data and the frequency domain digital data from the other digital data. The circuit has a first data holder for holding first data and a second data holder for holding second data. A first multiplier multiplies the first data, and a second multiplier multiplies the first data by a second coefficient. A third multiplier multiplies the second data by a third coefficient, and afourth multiplier multiplies the second data by a fourth coefficient. An adder adds an output of the first multiplier to an output of the third multiplier, and outputs the result of addition so as to feed back the result of addition to the first data holder; and a subtracter subtracts an output of the second multiplier from an output of the fourth multiplier and for outputs the result of subtraction so as to feed back the result of subtraction to the second data holder.
摘要翻译： 在正交函数发生电路中，通过小规模电路以高精度生成正交函数。 该电路采用时域数字数据和频域数字数据之间的正交变换，从其他数字数据中获取时域数字数据和频域数字数据之一。 电路具有用于保持第一数据的第一数据保持器和用于保持第二数据的第二数据保持器。 第一乘法器乘以第一数据，第二乘法器将第一数据乘以第二系数。 第三乘法器将第二数据乘以第三系数，并且第一乘法器将第二数据乘以第四系数。 加法器将第一乘法器的输出与第三乘法器的输出相加，并输出相加结果，以将加法结果反馈到第一数据保持器; 并且减法器从第四乘法器的输出中减去第二乘法器的输出，并输出相减结果，以便将减法结果反馈到第二数据保持器。
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