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公开(公告)号：US07697637B2
公开(公告)日：2010-04-13
申请号：US11450465
申请日：2006-06-12
申请人： Tatsuaki Kitta , Takanori Iwamatsu
发明人： Tatsuaki Kitta , Takanori Iwamatsu
IPC分类号： H04L27/00
CPC分类号： H04L27/2067 , H04L7/0029 , H04L7/0054 , H04L2027/0032 , H04L2027/0057 , H04L2027/0067 , H04L2027/0079
摘要： A demodulation circuit can perform a capturing operation although a frequency error is large. A phase comparator out puts a predetermined value other than 0 as a determination result of a phase error when a phase error of a carrier wave is large and a signal point is located at a predetermined position. A loop filter outputs a negative minimum value to an integrator when an integrated value of a determination result reaches a positive maximum value of a limiter. Thus, when a phase error is large, a value changing from a negative minimum value to a positive maximum value is output from the loop filter, thereby realizing a broad synchronous capture range.
摘要翻译： 尽管频率误差较大，但是解调电路可以执行捕获操作。 当载波的相位误差较大并且信号点位于预定位置时，相位比较器输出将除0之外的预定值作为相位误差的确定结果。 当确定结果的积分值达到限制器的正最大值时，环路滤波器向积分器输出负最小值。 因此，当相位误差大时，从环路滤波器输出从负最小值变化到正最大值的值，从而实现宽的同步捕获范围。
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公开(公告)号：US20070172002A1
公开(公告)日：2007-07-26
申请号：US11450465
申请日：2006-06-12
申请人： Tatsuaki Kitta , Takanori Iwamatsu
发明人： Tatsuaki Kitta , Takanori Iwamatsu
CPC分类号： H04L27/2067 , H04L7/0029 , H04L7/0054 , H04L2027/0032 , H04L2027/0057 , H04L2027/0067 , H04L2027/0079
摘要： A demodulation circuit can perform a capturing operation although afrequency error is large. A phase comparator out puts a predetermined value other than 0 as a determination result of a phase error when a phase error of a carrier wave is large and a signal point is located at a predetermined position. A loop filter outputs a negative minimum value to an integrator when an integrated value of a determination result reaches a positive maximum value of a limiter. Thus, when a phase error is large, a value changing from a negative minimum value to a positive maximum value is output from the loop filter, thereby realizing a broad synchronous capture range.
摘要翻译： 虽然频率误差大，但是解调电路可以进行拍摄操作。 当载波的相位误差较大并且信号点位于预定位置时，相位比较器输出将除0之外的预定值作为相位误差的确定结果。 当确定结果的积分值达到限制器的正最大值时，环路滤波器向积分器输出负最小值。 因此，当相位误差大时，从环路滤波器输出从负最小值变化到正最大值的值，从而实现宽的同步捕获范围。
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公开(公告)号：US20070172001A1
公开(公告)日：2007-07-26
申请号：US11382490
申请日：2006-05-10
申请人： Tatsuaki Kitta , Takanori Iwamatsu
发明人： Tatsuaki Kitta , Takanori Iwamatsu
CPC分类号： H04L27/3872 , H04L7/0029 , H04L25/0305 , H04L27/0002
摘要： A demodulation circuit according to the present invention comprises an automatic equalizer for carrying out equalization processing of a signal, a carrier recovery circuit for carrying out carrier recovery processing based on an equalized signal by the automatic equalizer. A center tap for carrying out an amplitude control of the automatic equalizer is placed on an input side thereof, and a control signal to the center tap is transmitted from the automatic equalizer.
摘要翻译： 根据本发明的解调电路包括用于执行信号的均衡处理的自动均衡器，用于通过自动均衡器基于均衡信号进行载波恢复处理的载波恢复电路。 用于执行自动均衡器的幅度控制的中心抽头被放置在其输入侧，并且从自动均衡器发送到中心抽头的控制信号。
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公开(公告)号：US06683906B1
公开(公告)日：2004-01-27
申请号：US09516986
申请日：2000-03-01
申请人： Takanori Iwamatsu
发明人： Takanori Iwamatsu
IPC分类号： H04L2730
CPC分类号： H04B1/7115 , H04B1/7117 , H04B7/0854 , H04B2001/70935 , H04J13/0025
摘要： A radio communication apparatus subjects each signal which is received via a multi-path and demodulated, to a Hadamard transform at each of fingers, by use of an M-ary quadrature coding scheme, obtains correlation values of codes, combines correlation values output from fingers which obtain valid correlation values, and demodulates a received signal based on a maximum correlation value of combined correlation values. The radio communication apparatus includes an operation unit which obtains a difference between a maximum value and a second largest value of the correlation values of a corresponding one of the fingers, and a lock controller which enables and locks the correlation values output from the corresponding one of the fingers when the difference obtained by the operation unit is greater than or equal to a predetermined value.
摘要翻译： 无线电通信装置通过使用M进制正交编码方案，将通过多路径接收并解调的每个信号对每个手指上的Hadamard变换进行对象，获得代码的相关值，组合从手指输出的相关值 其获得有效的相关值，并且基于组合相关值的最大相关值来解调接收信号。 无线电通信装置包括一个操作单元，该操作单元获得相应的一个手指的相关值的最大值和第二个最大值之间的差;以及锁定控制器，其使能并锁定从相应的一个手指的相应值输出的相关值 当由操作单元获得的差值大于或等于预定值时，手指。
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公开(公告)号：US06507625B2
公开(公告)日：2003-01-14
申请号：US09418453
申请日：1999-10-15
申请人： Takanori Iwamatsu , Mitsuo Kakuishi
发明人： Takanori Iwamatsu , Mitsuo Kakuishi
IPC分类号： H04L2738
CPC分类号： H04L27/38 , H04L27/362
摘要： A digital modulator and digital demodulator with quadrature amplitude modulation (QAM) schemes, which are designed to modulate or demodulate RZ-coded baseband signals. The digital modulator comprises first to fourth roll-off filters and a first and second inverters connected to the second and fourth roll-off filters. It also comprises a parallel-to-serial converter to successively selects the outputs of the first roll-off filter, third roll-off filter, first inverter, and second inverter. A D/A converter converts the selected digital signal stream into an analog signal. The roll-off filters and inverters operate at a predetermined clock frequency, while the parallel-to-serial converter and the D/A converter work at a frequency four times the predetermined clock frequency. The digital demodulator reverses the above modulation process to reproduce the baseband signals.
摘要翻译： 具有正交幅度调制（QAM）方案的数字调制器和数字解调器，被设计为调制或解调RZ编码的基带信号。 数字调制器包括第一至第四滚降滤波器以及连接到第二和第四滚降滤波器的第一和第二反相器。 它还包括并行转换器，用于连续选择第一滚降滤波器，第三滚降滤波器，第一反相器和第二反相器的输出。 D / A转换器将所选择的数字信号流转换成模拟信号。 滚降滤波器和反相器以预定的时钟频率工作，而并行到串行转换器和D / A转换器以预定时钟频率的四倍的频率工作。 数字解调器反转上述调制过程以再现基带信号。
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公开(公告)号：US6028902A
公开(公告)日：2000-02-22
申请号：US828419
申请日：1997-03-28
CPC分类号： H04L7/0054 , H04L7/0062
摘要： A clock phase detecting circuit is provided which is arranged in a receiving section of a multiplex radio apparatus. Difference detecting unit detects the difference between input and output signals to and from an equalizing circuit, and squaring unit squares the detected difference. The squared value thus obtained shows a minimum value when the phase of a clock signal output from a clock regenerating circuit coincides with a normal position of signal point. Therefore, phase adjusting unit outputs a control signal to the clock regenerating circuit while monitoring the squared value, to adjust the phase of the clock signal output from the clock regenerating circuit so that the squared value output from the squaring unit may be minimized.
摘要翻译： 提供了一种布置在多路复用无线电设备的接收部分中的时钟相位检测电路。 差分检测单元检测来自均衡电路的输入和输出信号之间的差异，平方单元对检测到的差异进行平方。 由此获得的平方值表示从时钟再生电路输出的时钟信号的相位与信号点的正常位置一致的最小值。 因此，相位调整单元在监视平方值的同时向时钟再生电路输出控制信号，调整从时钟再生电路输出的时钟信号的相位，使从平方单元输出的平方值最小化。
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公开(公告)号：US5987071A
公开(公告)日：1999-11-16
申请号：US57698
申请日：1998-04-09
申请人： Takanori Iwamatsu , Mitsuo Kakuishi
发明人： Takanori Iwamatsu , Mitsuo Kakuishi
CPC分类号： H04L27/38 , H04L27/362
摘要： A digital modulator and digital demodulator with quadrature amplitude modulation (QAM) schemes, which are designed to modulate or demodulate RZ-coded baseband signals. The digital modulator comprises first to fourth roll-off filters and a first and second inverters connected to the second and fourth roll-off filters. It also comprises a parallel-to-serial converter to successively selects the outputs of the first roll-off filter, third roll-off filter, first inverter, and second inverter. A D/A converter converts the selected digital signal stream into an analog signal. The roll-off filters and inverters operate at a predetermined clock frequency, while the parallel-to-serial converter and the D/A converter work at a frequency four times the predetermined clock frequency. The digital demodulator reverses the above modulation process to reproduce the baseband signals.
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公开(公告)号：US5978415A
公开(公告)日：1999-11-02
申请号：US533119
申请日：1995-09-25
CPC分类号： H04L27/01
摘要： The invention provides an automatic amplitude equalizer for compensating an amplitude characteristic of an input signal, wherein a control signal for equalizing an inclination amplitude distortion of an input signal is detected making use of a pair of digital demodulated signals to compensate for the amplitude characteristic of the input signal with a high degree of accuracy and which can be constructed with a reduced circuit scale and at a reduce cost. The automatic amplitude equalizer includes a first-order inclination amplitude equalization section for compensating for an amplitude characteristic of an input signal in accordance with a first-order inclination amplitude characteristic, and a control section for discriminating a direction of variation of a value of a first one of a pair of digital demodulated signals originating from the input signal, detecting error information from the other, second one of the digital demodulated signals which is orthogonal to the first signal, and outputting a control signal for the first-order inclination amplitude equalization section based on a correlation between the error information and the direction of variation of the value of the first signal.
摘要翻译： 本发明提供一种自动幅度均衡器，用于补偿输入信号的幅度特性，其中使用一对数字解调信号来检测用于均衡输入信号的倾斜幅度失真的控制信号，以补偿输入信号的振幅特性 输入信号具有高精确度，并且可以以降低的电路规模和降低成本来构造。 自动幅度均衡器包括：一阶倾斜幅度均衡部分，用于根据一阶倾斜幅度特性补偿输入信号的幅度特性;以及控制部分，用于鉴别第一 从输入信号产生的一对数字解调信号中的一个，从与第一信号正交的数字解调信号中的另一个第二数字解调信号检测出错误信息，并输出一阶倾斜幅度均衡部分的控制信号 基于误差信息与第一信号的值的变化方向之间的相关性。
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9.发明授权Inter-cross wave compensation method and apparatus performing frequency conversion on signed not detected by a demodulating unit 失效交叉波补偿方法和装置，其通过解调单元未被检测到，进行频率转换
公开(公告)号：US5920595A
公开(公告)日：1999-07-06
申请号：US607093
申请日：1996-02-28
申请人： Takanori Iwamatsu
发明人： Takanori Iwamatsu
IPC分类号： H03H21/00 , H03D7/16 , H04B1/12 , H04B7/005 , H04B7/10 , H04J11/00 , H04L27/38 , H03H7/40 , H03D3/24
摘要： A method and apparatus for inter-cross wave compensation. There are provided a frequency conversion unit for performing frequency conversion for one of two received polarized wave signals, an analog/digital converter for converting the one of the polarized wave signals into a digital signal, a digital orthogonal detection unit for obtaining two orthogonal detection signals, and a digital equalizing unit for performing an equalizing process for outputs of the orthogonal detection unit. Further provided are a digital inter-cross wave compensating unit for receiving the other of the two received polarized wave signals as a digital signal and for outputting a signal used for compensating the output of the equalizing unit, and an adding unit for adding the output of the equalizing unit and the output of the digital inter-cross wave compensating unit. This structure allows a digital demodulation method to be applied to the inter-cross wave compensation, thereby making it possible to form the inter-cross wave compensating apparatus as an LSI and reducing the size and cost of the apparatus. In addition, inter-cross wave compensation can be easily performed even for polarized wave signals which are transmitted without synchronization during modulation for transmission.
摘要翻译： 一种交叉波补偿的方法和装置。 提供了一个频率转换单元，用于对两个接收极化波信号之一进行频率转换，一个用于将一个极化波信号转换为数字信号的模/数转换器，用于获得两个正交检测信号的数字正交检测单元 以及用于对正交检测单元的输出执行均衡处理的数字均衡单元。 还提供了一种数字交叉波补偿单元，用于接收两个接收的极化波信号中的另一个作为数字信号，并输出用于补偿均衡单元的输出的信号;以及加法单元，用于将 均衡单元和数字交叉波补偿单元的输出。 这种结构允许将数字解调方法应用于跨交波补偿，从而可以形成交叉波补偿装置作为LSI并且减小装置的尺寸和成本。 此外，即使对于在传输调制期间没有同步地传输的偏振波信号，也可以容易地进行跨越波补偿。
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公开(公告)号：US5648988A
公开(公告)日：1997-07-15
申请号：US573075
申请日：1995-12-15
IPC分类号： H04B3/06 , H03H15/00 , H03H17/00 , H03H17/06 , H03H21/00 , H04B7/005 , H04L25/03 , H04L27/00 , H04L27/01 , H04L27/38 , H03H7/30 , H03H7/40
CPC分类号： H04L27/38 , H04L25/03044 , H03H17/06
摘要： A transversal type digital roll-off filter receiving a signal n-time sampled from analog signal carrying a pulse train of symbol rate T, includes a transversal type delay line including a plurality of delay elements each having a delay time T/n. Nodes are positioned between adjacent two delay elements. The filter further includes a memory for providing first tap rating ratios to control signals of the nodes and a calculation circuit for monitoring pulse forms of the output signal of the filter, and calculating second ratios to additionally control a central node and every n-th node counted from the central node, where the second ratios are calculated to make the output pulse good in shape. The filter acts as a roll-off filter and as an automatic equalizer. In a method of diagnosing the circuits in the above system, a memory in a transmitter further has second tap rating ratios used to diagnose the system, where the first and second ratios are switchably output to a digital filter in the transmitter. The second tap rating ratios allow the first filter itself alone to output good-shape pulses. The method includes the steps of switching the first memory to output the second ratios and comparing an eye diagram with a reference level, at a point after the first filter, to determine a cause of deteriorating the pulse forms.
摘要翻译： 接收从承载符号率T的脉冲串的模拟信号采样的信号的横向数字滚降滤波器包括横向型延迟线，其包括多个具有延迟时间T / n的延迟元件。 节点位于相邻的两个延迟元件之间。 滤波器还包括用于提供第一抽头额定比以控制节点的信号的存储器和用于监视滤波器的输出信号的脉冲形式的计算电路，以及计算第二比率以附加地控制中央节点和每个第n个节点 从中央节点计数，其中计算第二比率以使输出脉冲形状良好。 滤波器作为滚降滤波器和自动均衡器。 在上述系统中诊断电路的方法中，发射机中的存储器还具有用于诊断系统的第二抽头额定比，其中第一和第二比率可切换地输出到发射机中的数字滤波器。 第二抽头额定比允许第一过滤器本身单独输出良好形状的脉冲。 该方法包括以下步骤：在第一滤波器之后的点处切换第一存储器以输出第二比率并将眼图与参考电平进行比较，以确定脉冲形式恶化的原因。
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