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    Methods and apparatus for receiving N-chip resistant codes
    1.
    发明授权
    Methods and apparatus for receiving N-chip resistant codes 有权
    接收N芯片抗码的方法和装置

    公开(公告)号：US06618430B1

    公开(公告)日：2003-09-09

    申请号：US09211096

    申请日：1998-12-14

    申请人： Farideh Khaleghi ,  Norman P. Secord ,  Leo Strawczynski

    发明人： Farideh Khaleghi ,  Norman P. Secord ,  Leo Strawczynski

    IPC分类号： H04B169

    CPC分类号： H04B1/7115 ,  H04B1/7183 ,  H04B2201/709709 ,  H04J13/10

    摘要： The invention relates to systems and methods for receiving signals modulated with a carrier frequency, wherein the signals include spreading chip sequences having at least one zero. The invention includes a method of receiving and despreading spread spectrum signals wherein the spread spectrum signals include spreading chip sequences having at least one zero and at least one non-zero chip. The method includes receiving and sampling a spread spectrum communication signal. The receiver generates a despreading code which is synchronized with the sampled spread spectrum communication signal. The sampled spread spectrum communication signal is then despread with the despreading code by omitting at least one operation involving at least one zero chip. The invention further includes a receiver configured to receive signals modulated with a carrier frequency over a channel, wherein the signals include spreading chip sequences having at least one zero. The receiver includes an antenna capable of receiving a spread spectrum communication signal. It also includes a despreading code generator connected to the antenna. The receiver includes a demodulator connected to the antenna and configured to separate the carrier frequency from the spread spectrum communication signal. It also includes a searcher connected to the demodulator and configured to synchronize a despreading code generated by the despreading code generator with the spread spectrum communication signal. The receiver also includes a Rake receiver connected to the demodulator, configured to despread the separated spread spectrum communication signal and to omit at least one operation involving at least one zero chip.

    摘要翻译： 本发明涉及用于接收用载波频率调制的信号的系统和方法，其中信号包括具有至少一个零的扩展码片序列。 本发明包括一种接收和解扩扩频信号的方法，其中扩频信号包括具有至少一个零和至少一个非零芯片的扩展码片序列。 该方法包括对扩展频谱通信信号进行接收和采样。 接收机产生与采样扩频通信信号同步的解扩码。 然后，通过省略至少一个涉及至少一个零芯片的操作，利用解扩码对采样扩频通信信号进行解扩。 本发明还包括被配置为接收通过信道以载波频率调制的信号的接收机，其中所述信号包括具有至少一个零的扩展码片序列。 接收机包括能够接收扩展频谱通信信号的天线。 它还包括连接到天线的解扩码生成器。 接收机包括连接到天线的解调器，并被配置为将载波频率与扩展频谱通信信号分开。 它还包括连接到解调器并被配置为使由解扩码产生器产生的解扩码与扩频通信信号同步的搜索器。 接收机还包括连接到解调器的Rake接收机，被配置为对分离的扩频通信信号进行解扩，并且省略涉及至少一个零芯片的至少一个操作。

    Methods and apparatus of N-chip resistant spreading in CDMA systems
    2.
    发明授权
    Methods and apparatus of N-chip resistant spreading in CDMA systems 失效
    CDMA系统中N芯片抗扩散的方法和装置

    公开(公告)号：US06317422B1

    公开(公告)日：2001-11-13

    申请号：US09060604

    申请日：1998-04-15

    申请人： Farideh Khaleghi ,  Norman P. Secord ,  Leo Strawczynski

    发明人： Farideh Khaleghi ,  Norman P. Secord ,  Leo Strawczynski

    IPC分类号： H04B7216

    CPC分类号： H04J13/10 ,  H04B2201/709709 ,  H04J13/0022

    摘要： Methods and apparatus for generating spreading codes in a CDMA system are disclosed in accordance with the teachings of the present invention wherein the system includes a pseudonoise (PN) code generator and a logic device configured to replace a portion of a PN code generated by the PN code generator with at least one zero or to add at least one zero to a PN code generated by the PN code generator. The PN code generator generates a PN code made up of chips. One or more of these chips may be replaced by zeros or one or more zeros may be inserted between chips. Thus, when combined at a chip level with a substantially orthogonal code such as a Walsh code the resulting spreading code will be less effected and in some instances not effected at all by certain time delays inserted into the system (i.e time lag from multi-path dispersive transmissions).

    摘要翻译： 根据本发明的教导公开了用于在CDMA系统中产生扩展码的方法和装置，其中该系统包括伪噪声（PN）码发生器和被配置为替换由PN产生的PN码的一部分的逻辑装置 代码生成器，其具有至少一个零，或者将至少一个零加到由PN码发生器产生的PN码中。 PN码发生器产生由码片组成的PN码。 这些芯片中的一个或多个可以被零代替，或者可以在芯片之间插入一个或多个零。 因此，当在芯片级与诸如沃尔什码之类的基本上正交的代码组合时，所得到的扩展码将不太受到影响，并且在某些情况下根本不会通过插入到系统中的某些时间延迟来实现（即，从多路径 分散传输）。

    Multi-carrier CDMA communications systems
    3.
    发明授权
    Multi-carrier CDMA communications systems 失效
    多载波CDMA通信系统

    公开(公告)号：US6097712A

    公开(公告)日：2000-08-01

    申请号：US879773

    申请日：1997-06-20

    申请人： Norman P. Secord ,  Leo Strawczynski ,  Alberto Gutierrez ,  Ahmad Jalali

    发明人： Norman P. Secord ,  Leo Strawczynski ,  Alberto Gutierrez ,  Ahmad Jalali

    IPC分类号： H04L5/02 ,  H04B7/216 ,  H04L27/30

    CPC分类号： H04L5/026

    摘要： In a receiver of a simulcast multi-carrier CDMA (code division multiple access) communications system, a combined data signal is produced by combining signals representing data received for the plurality of carriers and is multiplied by the complex conjugate of a composite reference signal, representing characteristics of the plurality of carriers, produced by combining signals representing a reference signal received for the plurality of carriers, thereby improving multi-path resolution due to frequency diversity of the reference signal over the multiple carriers of the system. The receiver can be simplified by demodulating the signals of the plurality of carriers in common to produce a demodulated signal which is common to the data and reference signals for the plurality of carriers, the data and reference signals being subsequently separated using their respective orthogonal codes. Data signals can be recovered both with and without the improved multi-path resolution over the multiple carriers, and an optimum selection between them can be made.

    摘要翻译： 在联播多载波CDMA（码分多址）通信系统的接收机中，组合数据信号通过组合表示针对多个载波接收的数据的信号产生，并且乘以复合参考信号的复共轭，代表 通过组合表示为多个载波接收的参考信号的信号而产生的多个载波的特性，从而改善由于参考信号在系统的多个载波上的频率分集而导致的多径分辨率。 可以通过共同解调多个载波的信号来简化接收机，以产生对于多个载波的数据和参考信号共同的解调信号，随后使用它们各自的正交码分离数据和参考信号。 数据信号可以在多载波上具有和不具有改进的多径分辨率的情况下被恢复，并且可以在它们之间进行最佳的选择。

    Power control of a multi-subchannel mobile station in a mobile communication system
    5.
    发明授权
    Power control of a multi-subchannel mobile station in a mobile communication system 有权
    移动通信系统中的多子信道移动台的功率控制

    公开(公告)号：US06690944B1

    公开(公告)日：2004-02-10

    申请号：US09289584

    申请日：1999-04-12

    申请人： Wookwon Lee ,  Norman P. Secord

    发明人： Wookwon Lee ,  Norman P. Secord

    IPC分类号： H04B700

    CPC分类号： H04W52/228 ,  H04W52/146 ,  H04W52/24 ,  H04W52/50

    摘要： A closed loop power control apparatus is implemented within a basestation that receives a series of physical channels from a mobile station simultaneously in a DS-CDMA communication system such as those based on the cdma2000 specifications. This power control apparatus includes a series of Rakes that separate the code-subchannels, a series of SINR estimation devices that estimate the SINR for each of the code-subchannels, and a series of comparators thaw generate a multiple of power control bits that correspond to comparison results between the SINR estimates and a set of power threshold levels. These power control bits are transmitted to the mobile station and subsequently allow the mobile station to control the transmit powers for the physical channels individually.

    摘要翻译： 在基站内实现闭环功率控制装置，该基站在诸如基于cdma2000规范的DS-CDMA通信系统中同时从移动台接收一系列物理信道。 该功率控制装置包括分离代码子信道的一系列耙子，估计每个码子信道的SINR的一系列SINR估计装置，以及一系列比较器解冻产生对应于 SINR估计与一组功率阈值水平之间的比较结果。 这些功率控制位被发送到移动站，随后允许移动台单独地控制物理信道的发射功率。

    Co-channel interference reduction
    6.
    发明授权
    Co-channel interference reduction 失效
    同频干扰减少

    公开(公告)号：US6097773A

    公开(公告)日：2000-08-01

    申请号：US919281

    申请日：1997-08-28

    申请人： Alan J. A. Carter ,  Derek Hilborn ,  Norman P. Secord

    发明人： Alan J. A. Carter ,  Derek Hilborn ,  Norman P. Secord

    IPC分类号： H04B7/08 ,  H04B7/10

    CPC分类号： H04B7/0851

    摘要： Co-channel interference in an AMPS (Advanced Mobile Phone System) receiver, having at least two diversity paths each for producing a received signal, is reduced by determining weights for combining the received signals in dependence upon the received signals and a reference signal, combining the received signals in accordance with the determined weights to produce a combined received signal, demodulating the combined received signal, and producing the reference signal by amplitude limiting the combined received signal or modulating the demodulated signal or a signal derived from the demodulated signal, so that the reference signal is produced from the combined received signal with amplitude variations reduced and with frequency variations of the desired signal substantially maintained.

    摘要翻译： 具有至少两个用于产生接收信号的分集路径的AMPS（高级移动电话系统）接收机中的同频干扰通过根据所接收的信号和参考信号确定用于组合接收信号的权重来减少，组合 根据确定的权重接收信号以产生组合的接收信号，解调组合的接收信号，并通过幅度限制组合接收信号或调制解调信号或从解调信号得到的信号产生参考信号，使得 参考信号由组合的接收信号产生，幅度变化减小，并且所需信号的频率变化基本保持。