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    • 97. 发明授权
    • Method and apparatus for generating non-recursive variable rate orthogonal spreading codes
    • 用于生成非递归可变速率正交扩展码的方法和装置
    • US07609749B1
    • 2009-10-27
    • US12080131
    • 2008-03-31
    • Eric K. HallThomas R. GiallorenziRichard B. Ertel
    • Eric K. HallThomas R. GiallorenziRichard B. Ertel
    • H04B1/00
    • H04J13/0044H04J13/12
    • A method for constructing and selecting non-recursive orthogonal variable spreading factor (OVSF) codes is provided. The method includes: defining a variable B=SFmax/SFmin, where SFmax is a maximum desired spreading factor and SFmin is a minimum desired spreading factor; forming B unique base matrices Gk of dimension SFmin×SFmin, where GiGiT=SFminImin ∀i, where T denotes a matrix transpose and Imin is an SFmin×SFmin identity matrix; forming a modulation matrix M of dimension B×B such that MMT=BIB, where IB is a B×B identity matrix; forming an SFmax×SFmax orthogonal variable spread factor (OVSF) code matrix C′ as: C ′ = [ M 1 , 1 · G 1 M 1 , 2 · G 2 … M 1 , B · G B M 2 , 1 · G 1 M 2 , 2 · G 2 … M 2 , B · G B ⋮ ⋮ ⋰ ⋮ M B , 1 · G 1 M B , 2 · G 2 … M B , B · G B ] , where Mi,j is a scalar from the i-th row and j-th column of the modulation matrix M, Gl . . . GB is the k-th base matrix Gk and Mi,j·Gk denotes the multiplication of the elements of Gk by the scalar Mi,j; selecting a row of the OVSF code matrix C′ to use as a pseudo-noise (PN) code; and one of spreading or despreading a signal using the selected PN code.
    • 提供了一种用于构造和选择非递归正交可变扩展因子(OVSF)码的方法。 该方法包括:定义变量B = SFmax / SFmin,其中SFmax是最大期望扩频因子,SFmin是最小期望扩频因子; 形成尺寸为SFminxSFmin的B唯一基本矩阵Gk,其中GiGiT = SFminImin∀i,其中T表示矩阵转置,Imin是SFminxSFmin单位矩阵; 形成尺寸为BxB的调制矩阵M,使得MMT = BIB,其中IB是BxB单位矩阵; 形成SFmaxxSFmax正交可变扩展因子(OVSF)码矩阵C'为:C'= [M 1, G 1 M 1,2, G 2 ... M 1,B。 G B M 2,1。 G 1 M 2,2。 G 2 ... M 2,B。 B,⋮⋮⋰⋮M B,1。 G 1 M B,2。 G 2 ... M B,B。 G B],其中Mi,j是从调制矩阵M,G1的第i行和第j列的标量。 。 。 GB是第k个基本矩阵Gk和Mi,j.Gk表示Gk的元素乘以标量Mi,j; 选择一行OVSF码矩阵C'以用作伪噪声(PN)码; 以及使用所选PN码扩展或解扩信号的一个。
    • 98. 发明申请
    • SELF CLOCK GENERATION
    • 自制时钟生成
    • US20090206905A1
    • 2009-08-20
    • US12034347
    • 2008-02-20
    • Richard Michael ReindlByungchae Kim
    • Richard Michael ReindlByungchae Kim
    • H03K3/027
    • H03K3/0315
    • A clock signal may be generated for a receiving circuit without requiring an external oscillator. A first digital circuit may convert a first signal edge at an input into a first clock signal at an output, and a second digital circuit, in feedback connection with the first digital circuit, may generate a second signal edge at the input based on the first clock signal at the output. Then, the first circuit may convert the second signal edge at the input to a second clock signal at the output. Thus, the first circuit and the second circuit, in combination, may generate a continuous stream of signal edges at the input and clock signals at the output. The second circuit may communicate with the controller circuit that may indicate that a subsequent clock signal is needed. The controller circuit may send commands and receive status from the receiving circuit.
    • 可以为接收电路产生时钟信号,而不需要外部振荡器。 第一数字电路可以将输入处的第一信号边沿转换为输出处的第一时钟信号,并且与第一数字电路反馈连接的第二数字电路可以基于第一数字电路的第一数字电路 输出时钟信号。 然后,第一电路可以将输入端的第二信号边沿转换成输出端的第二时钟信号。 因此,组合的第一电路和第二电路可以在输出处的输入和时钟信号处产生连续的信号边缘流。 第二电路可以与控制器电路通信,该控制器电路可能指示需要后续的时钟信号。 控制器电路可以从接收电路发送命令和接收状态。
    • 99. 发明授权
    • Electron gun providing improved thermal isolation
    • 电子枪提供改进的热隔离
    • US07550909B2
    • 2009-06-23
    • US11531196
    • 2006-09-12
    • Richard Brownell TrueLucas Kelly BehnkeKeith Lee Montgomery
    • Richard Brownell TrueLucas Kelly BehnkeKeith Lee Montgomery
    • H01J29/70
    • H01J23/06
    • An electron gun comprises a shell having distal and proximal ends, a cathode structure disposed within the shell and having an electron emitting surface, an anode physically coupled to the shell at the distal end and spaced a fixed distance from the emitting surface, and a plurality of leads adapted to apply a voltage to the cathode structure with respect to the anode sufficient to cause emission of the electrons from the emitting surface. The anode has an aperture for passage therethrough of the beam of electrons emitted by the emitting surface. A first insulator is disposed within the shell proximal to the cathode structure. The first insulator has plural apertures having respective sizes in relation to corresponding ones of the plurality of leads such that the plurality of leads pass therethrough without contacting the first insulator. The first insulator provides stand-off for the voltage between the anode and cathode. A second insulator is disposed with the shell proximal from the first insulator. The second insulator also has plural apertures permitting the plurality of leads to pass therethrough; however, the plurality of leads are tightly engaged within corresponding ones of the plural apertures of the second insulator to provide a vacuum barrier of the shell. A thermal choke is coupled between the first insulator and second insulator to provide an indirect thermal path therebetween.
    • 电子枪包括具有远端和近端的壳体,设置在壳体内并具有电子发射表面的阴极结构,在远端物理耦合到外壳并与发射表面间隔一定距离的阳极,以及多个 的引线适于相对于阳极向阴极结构施加足以引起来自发射表面的电子的电压。 阳极具有用于穿过由发射表面发射的电子束的孔。 第一绝缘体设置在靠近阴极结构的壳体内。 第一绝缘体具有多个孔,其相对于多个引线中的相应引线具有相应的尺寸,使得多个引线不通过第一绝缘体而通过。 第一绝缘体提供阳极和阴极之间的电压的间隔。 第二绝缘体设置成与壳体靠近第一绝缘体。 第二绝缘体还具有允许多根引线通过的多个孔; 然而,多个引线紧密地接合在第二绝缘体的多个孔的对应的引线内,以提供壳的真空阻挡层。 热扼流器耦合在第一绝缘体和第二绝缘体之间以在它们之间提供间接热路径。