公开(公告)号：US06792031B1

公开(公告)日：2004-09-14

申请号：US09691576

申请日：2000-10-18

Applicant: Sundararajan Sriram ,  Yuan Kang Lee ,  Katherine G. Brown ,  Zhenguo Gu

Inventor： Sundararajan Sriram ,  Yuan Kang Lee ,  Katherine G. Brown ,  Zhenguo Gu

IPC: H04B169

CPC classification number: H04B1/7117 ,  H04B1/7095 ,  H04B1/7113

Abstract: A system and method for maintaining timing in a CDMA rake receiver has a global chip counter that counts CDMA signal chips as they arrive at the CDMA rake receiver. A local pseudo-noise (PN) sequence replica of the incoming CDMA signal is generated and used to perform a sliding window correlation of the locally generated PN sequence replica with the incoming signal to correlate the CDMA signal timing relative to stored CDMA signal chip counts. The PN sequence timing is maintained relative to GCC, which avoids having to keep track of absolute time within each Rake finger.

Abstract translation: 用于维持CDMA瑞克接收机定时的系统和方法具有对CDMA信号芯片到达CDMA耙式接收机时进行计数的全局芯片计数器。 产生输入CDMA信号的本地伪噪声（PN）序列副本，并用于执行本地生成的PN序列副本与输入信号的滑动窗口相关，以使CDMA信号定时相对于存储的CDMA信号芯片计数相关。 PN序列定时相对于GCC保持，这避免了必须跟踪每个耙指中的绝对时间。

公开(公告)号：US06594680B1

公开(公告)日：2003-07-15

申请号：US09475932

申请日：1999-12-30

Applicant: Zhenguo Gu ,  Yuan Kang Lee

Inventor： Zhenguo Gu ,  Yuan Kang Lee

IPC: G06F102

CPC classification number: H04J13/10 ,  G06F7/584 ,  H04J13/0022

Abstract: Multiple PN sequences are generated in parallel using multiple LFSRs (10) or multiple mask circuits (40) coupled to a single LFSR. The offsets between PN sequences can be individually and independently set, either by setting the initial state in an LFSR (10) or setting a mask vector in a mask circuit (40). The LFSRs can be configured in real time to produce one or more blocks of PN sequence bits or to produce disjoint PN sequence bits. Zero insertion may be automatically generated in the LFSRs without additional mask circuitry. PN generating circuits may use either relative or absolute addressing, and may accommodate two levels of relative addressing. Further, one embodiment provides relative addressing without using masks.

Abstract translation: 使用耦合到单个LFSR的多个LFSR（10）或多个掩模电路（40）并行地生成多个PN序列。 可以通过在LFSR（10）中设置初始状态或在掩码电路（40）中设置掩码向量来单独和独立地设置PN序列之间的偏移。 可以实时配置LFSR以产生一个或多个PN序列比特块或产生不相交的PN序列比特。 在LFSR中可以自动生成零插入，无需额外的掩码电路。 PN发生电路可以使用相对寻址或绝对寻址，并且可以适应两个相对寻址的级别。 此外，一个实施例提供了不使用掩模的相对寻址。

公开(公告)号：US06436483B1

公开(公告)日：2002-08-20

申请号：US09769053

申请日：2001-01-25

Applicant: Miklos Palmasi ,  Anh Nguyen ,  Kang Lee ,  Lily O'Boyle

Inventor： Miklos Palmasi ,  Anh Nguyen ,  Kang Lee ,  Lily O'Boyle

IPC: C08J704

Abstract: A method for producing a tamper evident security holographic label and overlaminate using UV casting techniques, and a security device so produced, comprising a clear protective layer; a thin layer of clear UV cured resin cast partly onto the protective layer following a designed pattern; another layer of UV cured resin bearing a cast holographic image, wherein the bond of the holographic image layer is stronger toward the surface of the protective layer than it is toward the surface of the pattern layer; a reflective layer strongly attached to the adjacent holographic layer; and an adhesive layer bonded to the reflective layer. Such a composite product when adhered to a base substrate via the adhesive layer will show no visible security feature to the unaided eye due to the thin nature of the clear security pattern. But upon delamination attempts, the ultra-thin holographic image layer will be broken at the weakest interfacial bond which is between the two UV cured resin surfaces, providing visible evidence of tampering in the form of a break pattern identical to that of the clear pattern layer.