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    • 6. 发明申请
    • EARLY-LATE SYNCHRONIZER HAVING REDUCED TIMING JITTER
    • 具有减少时序抖动的早期同步器
    • WO2004047327A1
    • 2004-06-03
    • PCT/EP2002/012814
    • 2002-11-15
    • TELECOM ITALIA S.P.A.STMICROELECTRONICS S.R.L.ETTORRE, DonatoGRAZIANO, MaurizioMELIS, BrunoFINOTELLO, AndreaRUSCITTO, Alfredo
    • ETTORRE, DonatoGRAZIANO, MaurizioMELIS, BrunoFINOTELLO, AndreaRUSCITTO, Alfredo
    • H04B1/707
    • H04B1/7085H04B1/709
    • A device for maintaining fine alignment between an incoming spread spectrum signal and a locally generated code in a digital communication receiver comprises: - a delay line (56) for storing a plurality of consecutive samples (E-1, E, M, L, L+1) of the incoming spread spectrum signal; - three digitally controlled interpolators (24, 26, 28) for determining by interpolation between consecutive samples an interpolated early sample (e), an interpolated middle sample (m) and an interpolated late sample (1); - two correlators (30, 32) for calculating an error signal (ξ) as the difference between the energy of the symbols computed from the interpolated early (e) and late (1) samples; - a circuit for generating a control signal (S¿OUT?) for controlling the interpolation phase of the digitally controlled interpolator (24) for the early sample (e), and - a digital non-linear filter (68), for smoothing the control signal (S¿OUT?) of the interpolator (24) for the early sample (e), enabling the update operation of the control signal only when the absolute value (|ξ(n)|) of the error signal at a time instant n is smaller than the absolute value (|ξ(n-1)|) of the same error signal at a time instant n-1.
    • 一种用于在数字通信接收机中保持输入扩频信号与本地生成代码之间的精确对准的装置,包括: - 延迟线(56),用于存储多个连续样本(E-1,E,M,L,L +1)的入射扩频信号; - 三个数字控制内插器(24,26,28),用于通过内插的早期采样(e),内插中间样本(m)和插值后期样本(1)来确定连续采样之间的内插; - 用于计算误差信号(xi)的两个相关器(30,32)作为从内插的早期(e)和晚期(1)样本计算的符号的能量之间的差; - 用于产生用于控制用于早期采样(e)的数字控制内插器(24)的内插相位的控制信号(S _ OUT <)的电路,以及 - 数字非线性滤波器(68),用于平滑 用于早期采样(e)的内插器(24)的控制信号(S _OUT?),使得只有当误差信号的绝对值(|| xi(n)||) 时刻n小于在时刻n-1的相同误差信号的绝对值(|| xi(n-1)||)。
    • 8. 发明申请
    • METHOD AND CIRCUIT FOR NOISE ESTIMATION, RELATED FILTER, TERMINAL AND COMMUNICATION NETWORK USING SAME, AND COMPUTER PROGRAM PRODUCT THEREFOR
    • 用于噪声估计的方法和电路,相关滤波器,使用其的终端和通信网络及其计算机程序产品
    • WO2005050623A1
    • 2005-06-02
    • PCT/EP2003/012629
    • 2003-11-12
    • TELECOM ITALIA S.P.A.BOLLANO, GianmarioETTORRE, DonatoPOUSAS NAVARRO, Rodrigo
    • BOLLANO, GianmarioETTORRE, DonatoPOUSAS NAVARRO, Rodrigo
    • G10L21/02
    • G10L21/0208
    • A filter such as a Wiener filter for noise reduction in a signal, such as a speech signal, affected by background noise includes a circuit (50) for determining values of an update function relating new value of estimated noise power (P noise-New ) to a previous value of estimated noise power (P noise ), the update function being a function of said previous estimated noise power (P noise ) and a mean input power spectral density (P IN-PSD ). The circuit (50) includes a look-up table (30) having values for the update function stored therein with the previous value of estimated noise power (P noise ) and the mean input power spectral density (P in _PSD ) as a first and a second search entry, respectively. These search entries are entered via an input module (10) and exploited by search circuitry (12 to 28) associated with the look-up table (30) for selectively searching values for the update function in the look-up table (30). The search is preferably carried out on the basis of an index (26) computed starting from said first and second search entries.
    • 诸如用于噪声降低的维纳滤波器的滤波器(例如语音信号)受背景噪声的影响包括:电路(50),用于确定将估计噪声功率的新值(Pnoise-New)与 估计噪声功率(Pnoise)的先前值,更新功能是所述先前估计噪声功率(Pnoise)和平均输入功率谱密度(PIN-PSD)的函数。 电路(50)包括具有存储在其中的具有估计噪声功率(Pnoise)的前一值和平均输入功率谱密度(Pin_PSD)的值作为第一和第二的查找表(30) 搜索条目。 这些搜索条目经由输入模块(10)输入,并且由与查找表(30)相关联的搜索电路(12至28)利用,用于选择性地搜索查找表(30)中的更新功能的值。 搜索优选地基于从所述第一和第二搜索条目开始计算的索引(26)来执行。
    • 10. 发明申请
    • INTERPOLATION FOR USE IN CHANNEL ESTIMATION
    • 用于通道估计的插值
    • WO2003081862A1
    • 2003-10-02
    • PCT/EP2003/002773
    • 2003-03-17
    • TELECOM ITALIA S.P.A.STMICROELECTRONICS S.R.L.ETTORRE, DonatoGRAZIANO, MaurizioMELIS, BrunoFINOTELLO, AndreasRUSCITTO, AlfredoVALLE, StefanoSIMONI, Lorena
    • ETTORRE, DonatoGRAZIANO, MaurizioMELIS, BrunoFINOTELLO, AndreasRUSCITTO, AlfredoVALLE, StefanoSIMONI, Lorena
    • H04L25/02
    • H04L25/0232
    • A method for the estimation of the transfer function of a transmission channel in a receiving system of UMTS type envisages the computation of a plurality of channel coefficients, included among known channel coefficients corresponding to pilot symbols, through the reiteration of an interpolation algorithm, capable of calculating an intermediate point (Z, f(Z)) between a first extreme and a second extreme of a determined interval, the first extreme being formed by at least two known points and the second extreme being formed by at least one known point, the intermediate point to be calculated having as abscissa (Z) the abscissa value of the mean point between the points defining the interval rounded off to the integer closest to the first extreme, and having as ordinate (F(Z)) the arithmetic average between the ordinate of the known point of the second extreme and the ordinate of a point, chosen between the two known points of the first extreme, having a distance from the intermediate point equal to the distance between the intermediate point and the known point of the second extreme.
    • 用于估计UMTS类型的接收系统中的传输信道的传递函数的方法设想通过重复插值算法来计算包括在与导频符号相对应的已知信道系数之中的多个信道系数,能够 计算确定间隔的第一极限和第二极限之间的中间点(Z,f(Z)),所述第一极值由至少两个已知点形成,所述第二极值由至少一个已知点形成, 要计算的中间点具有横坐标(Z),将定义间隔的间隔的平均点的横坐标值舍入到最接近第一极限的整数,并且具有纵坐标(F(Z))之间的算术平均值 在第二极端的已知点的纵坐标和在第一极端的两个已知点之间选择的点的纵坐标距离中间件的距离 点等于中间点与第二极限的已知点之间的距离。