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    • 41. 发明授权
    • System and method for performing time domain equalization
    • 用于执行时域均衡的系统和方法
    • US06353644B1
    • 2002-03-05
    • US09303730
    • 1999-05-03
    • Lujing CaiWeimin LiuXiao LiuWenye Yang
    • Lujing CaiWeimin LiuXiao LiuWenye Yang
    • H04B110
    • H04L25/03038H04L2025/03414H04L2025/03477
    • Disclosed is a system and method for signal conditioning and equalization in the time domain, preferably in a discrete multi-tone (DMT) modem. The system preferably includes a processor operating according to operating logic stored on a memory although a dedicated logical circuit may be employed. The operating logic includes logic executing the function of a low pass filter having a predetermined cutoff frequency configured to process a digitized data signal having a first sample rate f0, producing a filtered data signal at a second sample rate f1. The operating logic further includes logic which executes the function of a time domain equalizer, the time domain equalizer being configured to process the filtered signal to shorten the impulse response of the channel while at the same time, the time domain equalizer down-samples the filtered signal from the second sample rate f1, to a third sample rate f2 for further processing in the frequency domain.
    • 公开了一种在时域中信号调节和均衡的系统和方法,优选地在离散多音调(DMT)调制解调器中。 该系统优选地包括根据存储在存储器上的操作逻辑操作的处理器,尽管可以采用专用逻辑电路。 操作逻辑包括执行具有预定截止频率的低通滤波器的功能的逻辑,所述低通滤波器被配置为处理具有第一采样率f0的数字化数据信号,以第二采样率f1产生滤波数据信号。 操作逻辑还包括执行时域均衡器的功能的逻辑,时域均衡器被配置为处理滤波信号以缩短信道的脉冲响应,同时时域均衡器对滤波后的 信号从第二采样率f1到第三采样率f2,用于在频域中进一步处理。
    • 42. 发明授权
    • System and method for data sequence correlation in the time domain
    • 时域数据序列相关系统和方法
    • US06310896B1
    • 2001-10-30
    • US09174026
    • 1998-10-16
    • Ehud LangbergWeimin LiuXiao LiuWilliam Scholtz
    • Ehud LangbergWeimin LiuXiao LiuWilliam Scholtz
    • H04J306
    • H04L7/042H04L27/261H04L27/2655H04L27/2675
    • A system and method are disclosed for synchronizing a predetermined repeated data sequence contained in a first data signal at a first sample rate with the same predetermined repeated data sequence contained in a second data signal at a second sample rate in a data communications device. The system preferably includes a digital signal processor operating pursuant to logic stored on a memory. The logic includes synchronization logic which reduces the first sample rate to a predetermined correlation sample rate using a first decimator, resulting in a first reduced data signal. The synchronization logic also reduces the second sample rate to the same predetermined correlation sample rate using a second decimator, resulting in a second reduced data signal. Finally, the synchronization logic determines a sequence offset between the predetermined repeated data sequence contained in the first reduced data signal and the predetermined repeated data sequence contained in the second reduced data signal using a correlator. This sequence offset is used to determine a time delay that is applied to the second data signal, thereby synchronizing the predetermined repeated data sequence contained in the first and second data sequences.
    • 公开了一种系统和方法,用于使包含在第一采样率的第一数据信号中的预定重复数据序列与包含在数据通信设备中的第二采样率的第二数据信号中的相同预定重复数据序列同步。 该系统优选地包括根据存储在存储器上的逻辑操作的数字信号处理器。 逻辑包括同步逻辑,其使用第一抽取器将第一采样率降低到预定的相关采样率,从而产生第一缩减的数据信号。 同步逻辑还使用第二抽取器将第二采样率降低到相同的预定相关采样率,导致第二降低的数据信号。 最后,同步逻辑使用相关器确定包含在第一简化数据信号中的预定重复数据序列与包含在第二缩减数据信号中的预定重复数据序列之间的序列偏移。 该序列偏移用于确定施加到第二数据信号的时间延迟,从而使包含在第一和第二数据序列中的预定重复数据序列同步。
    • 45. 发明申请
    • WIRELESS DATA TRANSMISSION INCLUDING ASSIST SIGNALS
    • 无线数据传输,包括辅助信号
    • US20130079045A1
    • 2013-03-28
    • US13622145
    • 2012-09-18
    • Liangping MaWeimin LiuAriela ZeiraRobert A. DiFazio
    • Liangping MaWeimin LiuAriela ZeiraRobert A. DiFazio
    • H04W72/04
    • H04B7/0617H04B7/0456H04B7/0626H04B7/086H04W16/14H04W52/16
    • Methods, systems and apparatuses for dynamic spectrum access by both primary users (PUs) and secondary users (SUs) are disclosed. In one embodiment, a method for communicating over a channel may include obtaining, at a secondary transmitter, first and second signals intended for a primary receiver and secondary receivers, respectively; generating, at the secondary transmitter, an assist signal based, at least in part, on the obtained first signal; generating, at the secondary transmitter, a data signal based, at least in part, on the obtained second signal; determining, at the secondary transmitter, a power split ratio between the data signal and the assist signal based, at least in part, on any of a power and a signal-to-noise ratio of the first signal; and generating, at the secondary transmitter, a third signal comprising (i) the data signal and (ii) the assist signal in accordance with power split ratio.
    • 公开了主要用户(PU)和次要用户(SU)的动态频谱接入的方法,系统和装置。 在一个实施例中,用于通过信道进行通信的方法可以包括在次发射机处分别获得用于主接收机和辅助接收机的第一和第二信号; 至少部分地基于所获得的第一信号,在辅助发射机处产生辅助信号; 至少部分地基于所获得的第二信号在二次发射机处产生数据信号; 至少部分地基于所述第一信号的功率和信噪比来确定所述辅助发射机在所述数据信号和所述辅助信号之间的功率分配比; 以及在次发射机处产生包括(i)数据信号和(ii)根据功率分配比的辅助信号的第三信号。
    • 47. 发明授权
    • HRPD network access authentication method based on cave algorithm
    • 基于洞穴算法的HRPD网络接入认证方法
    • US07990930B2
    • 2011-08-02
    • US12421986
    • 2009-04-10
    • Weimin Liu
    • Weimin Liu
    • H04B7/216
    • H04W12/08H04L63/0428H04L63/08H04L63/0853H04W12/06
    • A HRPD network access authentication method based on CAVE algorithm is provided. An AT (Access Terminal) generates a random number “RAND” necessary for a calculation of an AUTH1 by using a “Random text” included in the CHAP Challenge message. A UIM (User Identity Module) card works out the AUTH1 by using the random number “RAND” and an SSD_A (Shared Secret Data A) in the UIM card. The AT carries the AUTH1 in a Result field of the CHAP Response message. An AN-AAA (Access Network-Authentication, Authorization, and Accounting) generates the random number “RAND” necessary for the calculation of an AUTH2 by using a “Random text” included in a Radius Access Request message. The AN-AAA works out the AUTH2 by using the random number “RAND”. The two results AUTH1 and AUTH2 are compared. If the results are the same, the authentication on the AT passes. Otherwise, AT access is rejected.
    • 提供了基于CAVE算法的HRPD网络访问认证方法。 AT(接入终端)通过使用CHAP挑战消息中包含的“随机文本”生成AUTH1的计算所需的随机数“RAND”。 UIM(用户识别模块)卡通过在UIM卡中使用随机数“RAND”和一个SSD_A(共享秘密数据A)来处理AUTH1。 AT在CHAP响应消息的结果字段中携带AUTH1。 AN-AAA(接入网络认证,授权和计费)通过使用包含在Radius接入请求消息中的“随机文本”生成AUTH2计算所需的随机数“RAND”。 AN-AAA通过使用随机数“RAND”来编写AUTH2。 比较两个结果AUTH1和AUTH2。 如果结果相同,AT上的认证通过。 否则AT访问被拒绝。
    • 49. 发明申请
    • Process for producing copper nanoparticles
    • 生产铜纳米粒子的方法
    • US20060053972A1
    • 2006-03-16
    • US10997220
    • 2004-11-23
    • Weimin LiuXiaobo WangSinggou Fu
    • Weimin LiuXiaobo WangSinggou Fu
    • B22F9/24
    • B22F1/0022B22F9/24B22F2998/00B82Y30/00C10M125/04C10M2201/05C10N2210/01C10N2220/08C10N2220/082Y10S977/896
    • The present invention provides a process for producing copper nanoparticles, comprising steps of: a) reacting an aqueous solution containing a reductant with an aqueous solution of a copper salt while stirring for 1-8 min, wherein the reductant being one or more selected from a group consisting of hydrazine hydrate, sodium borohydride and sodium hypophosphite; b) adding an apolar organic solution containing the extracting agent and continuing the stirring for 0.5-1.5 hrs, said extracting agent being one or more selected from the group consisting of alkyl dithiocarbonic acid and salts thereof, O,O′-dialkyl dithiophosphoric acid and salts thereof, and dialkylamino dithioformic acid and salts and said apolar organic solution being one selected from the group consisting of benzene, toluene and straight or branched alkanes having 6-12 carbon atoms, wherein the alkyl having 6-20 carbon atoms; and c) post-treating the reaction product to obtain copper nanoparticles.
    • 本发明提供一种生产铜纳米颗粒的方法,包括以下步骤:a)在搅拌1-8分钟的同时使含有还原剂的水溶液与铜盐水溶液反应,其中还原剂是选自以下的一种或多种: 由水合肼,硼氢化钠和次磷酸钠组成的组; b)加入含有提取剂的非极性有机溶液并继续搅拌0.5-1.5小时,所述提取剂是选自烷基二硫代碳酸及其盐,O,O-二烷基二硫代磷酸和 其盐和二烷基氨基二硫代甲酸及其盐,所述非极性有机溶液选自苯,甲苯和具有6-12个碳原子的直链或支链烷烃,其中具有6-20个碳原子的烷基; 和c)后处理反应产物以获得铜纳米颗粒。