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    • 55. 发明授权
    • Data receiving system using a decision feedback equalizer
    • 数据接收系统采用判决反馈均衡器
    • US5946350A
    • 1999-08-31
    • US736730
    • 1996-10-25
    • Mitsuru Uesugi
    • Mitsuru Uesugi
    • H03H21/00H04B3/10H04B7/005H04L25/03H03H7/30H03K5/159
    • H04L25/03146
    • A data receiving system, for equalizing a reception signal by using a decision feedback equalizer when the reception signal is formatted to have a sync signal positioned at the center of a burst, comprises a receiving buffer for storing reception data, training calculation means for obtaining a tap coefficient by performing a training using the sync signal involved in the reception data, a direction selecting means for selecting a preferable direction for a tracking of the decision feedback equalizer, based on a judgement as to which direction is preferable for the decision feedback equalizer between the direction identical with the receiving sequence of the reception data and the direction opposed to the receiving sequence of the reception data, and a tracking calculation means for performing the calculation of the decision feedback equalizer by tracking the reception data along the preferable direction using the tap coefficient given from the training calculation means having executed the training along the preferable direction selected by the direction selecting means. With this arrangement, the decision feedback equalizer can be used in the minimum phase transition which is the most effective condition for the DFE, thereby enhancing the effect of compensating the distortion derived from the multipath fading.
    • 一种数据接收系统,用于当接收信号被格式化为具有位于突发中心的同步信号时通过使用判决反馈均衡器对接收信号进行均衡,包括用于存储接收数据的接收缓冲器,用于获得接收信号的训练计算装置 通过使用在接收数据中涉及的同步信号进行训练来进行训练的抽头系数;方向选择装置,用于根据对于决策反馈均衡器的哪个方向优选的判定来选择用于跟踪判决反馈均衡器的优选方向 与接收数据的接收序列和与接收数据的接收序列相反的方向相同的方向,以及跟踪计算装置,用于通过使用抽头跟踪沿着优选方向的接收数据来执行判决反馈均衡器的计算 从具有执行的训练计算装置给出的系数 d沿着由方向选择装置选择的优选方向的训练。 通过这种布置,判决反馈均衡器可以用作DFE最有效条件的最小相位转换,从而增强补偿从多径衰落导出的失真的效果。
    • 56. 发明授权
    • Apparatus for calculating the square root of the sum of two squares
    • 用于计算两个平方和的平方根的装置
    • US5459683A
    • 1995-10-17
    • US277826
    • 1994-07-20
    • Mitsuru UesugiKouichi Honma
    • Mitsuru UesugiKouichi Honma
    • G06F17/10G06F7/544G06F7/552G06F7/38
    • G06F9/30021G06F7/544G06F7/552G06F2207/5525
    • A first digital signal of a serial form is processed into a second digital signal of a serial form. The second digital signal represents an absolute value of a value represented by the first digital signal. A third digital signal of a serial form is processed into a fourth digital signal of a serial form. The fourth digital signal represents an absolute value of a value represented by the third digital signal. The values represented by the first and third digital signals are compared to generate a comparison-result digital signal representing a result of the comparison. A calculation-result digital signal of a serial form is generated in response to the second digital signal, the fourth digital signal, and the comparison-result digital signal. The calculation-result digital signal represents a value which is approximate to a square root of a sum of a square of the value represented by the first digital signal and a square of the value represented by the third digital signal.
    • 将串行形式的第一数字信号处理成串行形式的第二数字信号。 第二数字信号表示由第一数字信号表示的值的绝对值。 串行形式的第三数字信号被处理成串行形式的第四数字信号。 第四数字信号表示由第三数字信号表示的值的绝对值。 将由第一和第三数字信号表示的值进行比较以产生表示比较结果的比较结果数字信号。 响应于第二数字信号,第四数字信号和比较结果数字信号产生串行形式的计算结果数字信号。 计算结果数字信号表示近似于由第一数字信号表示的值的平方和与由第三数字信号表示的值的平方的和的平方根的值。
    • 60. 发明授权
    • Multicarrier transmitting apparatus and multicarrier transmitting method
    • 多载波发射装置和多载波发射方法
    • US07995663B2
    • 2011-08-09
    • US11917745
    • 2006-06-21
    • Yuta SekiMitsuru UesugiEiji Ota
    • Yuta SekiMitsuru UesugiEiji Ota
    • H04L27/28
    • H04L27/2623
    • To narrow the dynamic range of multicarrier signals and prevent both the increment of cost and the degradation of power efficiency. A modulating part (101) modulates transport data. An S/P converting part (102) performs an S/P conversion of a modulated symbol and outputs the modulated symbols, the number of which is the same as the number of all subcarriers, to an IFFT part (103) in parallel. The IFFT part (103) assigns the modulated symbols to the subcarriers, the frequencies of which are orthogonal to each other, to perform an inverse fast Fourier transform. A P/S converting part (104) performs a P/S conversion of the signals of time domain. When the instantaneous amplitude level of an OFDM signal is lower than a predetermined threshold value, a pit clip part (105) replaces this amplitude level by the predetermined threshold value. In other words, when the instantaneous power of the OFDM signal is close to zero, the pit clip part (105) converts a power value to a value that is greater than the actual power value.
    • 缩小多载波信号的动态范围,防止成本增加和功率效率的退化。 调制部(101)调制传输数据。 S / P转换部分(102)执行调制符号的S / P转换,并且将其数量与所有子载波数相同的调制符号并行地输出到IFFT部分(103)。 IFFT部分(103)将调制符号分配给彼此正交的频率的子载波,以执行快速傅立叶逆变换。 P / S转换部(104)进行时域信号的P / S转换。 当OFDM信号的瞬时幅度电平低于预定阈值时,凹坑夹部分(105)将该幅度电平取代预定阈值。 换句话说,当OFDM信号的瞬时功率接近零时,凹坑夹部分(105)将功率值转换成大于实际功率值的值。