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    • 5. 发明申请
    • Apparatus and method for calculating square root
    • 计算平方根的装置和方法
    • US20070083587A1
    • 2007-04-12
    • US11495632
    • 2006-07-31
    • Hee-Jin RohGang-Mi GilMin-Goo KimHyun-Seok Oh
    • Hee-Jin RohGang-Mi GilMin-Goo KimHyun-Seok Oh
    • G06F7/38
    • G06F7/5525
    • An apparatus and method for calculating a square root are provided. The square root calculation apparatus calculates an approximated square root for an input value. An integer detector detects a position of a non-zero most significant bit (MSB) from the input value, and outputs an arbitrary integer value. A first approximated linear square root calculator outputs an approximated square root by applying the input value and an even integer value output from the integer detector to a first linear approximation equation. A second approximated linear square root calculator outputs an approximated square root by applying the input value and an odd integer value output from the integer detector to a second linear approximation equation. A controller controls a multiplexer such that the approximated square roots calculated by the first and second approximated linear square root calculators are output according to whether the integer value output from the integer detector is an even number or an odd number. The multiplexer outputs any one of the approximated square roots output from the first and second approximated linear square root calculators.
    • 提供了一种计算平方根的装置和方法。 平方根计算装置计算输入值的近似平方根。 整数检测器从输入值检测非零最高有效位(MSB)的位置,并输出任意的整数值。 第一近似线性平方根计算器通过将输入值和从整数检测器输出的偶数整数值应用于第一线性近似方程来输出近似平方根。 第二近似线性平方根计算器通过将输入值和从整数检测器输出的奇整数值应用于第二线性近似方程来输出近似平方根。 控制器控制多路复用器,使得根据从整数检测器输出的整数值是偶数还是奇数来输出由第一和第二近似线性平方根计算器计算出的近似平方根。 多路复用器输出从第一和第二近似线性平方根计算器输出的近似平方根中的任何一个。
    • 8. 发明授权
    • Apparatus and method for optimally compensating for imbalance between in-phase and quadrature-phase in a zero-IF OFDM receiver
    • 用于最佳地补偿零中频OFDM接收机中的同相和正交相位之间的不平衡的装置和方法
    • US07609772B2
    • 2009-10-27
    • US11148179
    • 2005-06-09
    • Hyun-Seok YuHyun-Seok OhJi-Won HaMin-Goo Kim
    • Hyun-Seok YuHyun-Seok OhJi-Won HaMin-Goo Kim
    • H04L27/28
    • H04L27/2649H04L25/061H04L2027/0016
    • An optimum I/Q imbalance compensating apparatus and method in a zero-IF OFDM receiver. In the apparatus, a first compensator generates a first symbol by removing interference from a second distorted symbol on an (Ns−m+1)th subcarrier from a first distorted symbol on an mth subcarrier by a first compensation coefficient in an OFDM FFT signal of Ns subcarriers. A first hard decider generates a first compensated symbol by hard-decision on the first symbol, an error calculator generates an error symbol by subtracting the first received symbol from the first compensated symbol. A second compensator generates a second symbol by eliminating interference from the first distorted symbol from the second distorted symbol using a second compensation coefficient. A second hard decider generates a second compensated symbol by hard-decision on the second symbol, and an adaptive controller updates the first compensation coefficient using the error symbol and the second compensation symbol.
    • 零中频OFDM接收机中的最佳I / Q不平衡补偿装置和方法。 在该装置中,第一补偿器通过在第(Ns-m + 1)个子载波上从第N个副载波上的第一失真符号中的第二失真符号除去干扰,产生第一符号,第一补偿系数在OFDM FFT信号中的第一补偿系数 Ns副载波。 第一硬判决器通过对第一符号进行硬判决来生成第一补偿符号,误差计算器通过从第一补偿符号减去第一接收符号来生成误差符号。 第二补偿器通过使用第二补偿系数消除来自第二失真符号的来自第一失真符号的干扰来产生第二符号。 第二硬判定器通过第二符号上的硬判决产生第二补偿符号,并且自适应控制器使用误差符号和第二补偿符号来更新第一补偿系数。