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    Low probability of detection emergency signaling system and method
    1.
    发明授权
    Low probability of detection emergency signaling system and method 有权
    低概率检测应急信号系统及方法

    公开(公告)号：US07944351B1

    公开(公告)日：2011-05-17

    申请号：US12350096

    申请日：2009-01-07

    申请人： Thomas R. Giallorenzi ,  Eric K. Hall ,  Michael D. Pulsipher ,  Marc J. Russon

    发明人： Thomas R. Giallorenzi ,  Eric K. Hall ,  Michael D. Pulsipher ,  Marc J. Russon

    IPC分类号： G08B1/08

    CPC分类号： G08B25/016 ,  G08B25/014 ,  G08B29/28

    摘要： An emergency locating system can include emergency transceivers and rescue transceivers. The emergency transceivers can be capable of repeat transmission of a distress message using a variable power level and variable spreading factor. A receive transceiver can be capable of receiving the distress messages and sending a confirmation message to the emergency transceiver. The emergency transceiver can be capable of receiving the confirmation message and terminating transmission of the distress message.

    摘要翻译： 紧急定位系统可以包括应急收发器和救援收发器。 应急收发器能够使用可变功率电平和可变扩频因子重复发送遇险消息。 接收收发器能够接收遇险消息并向紧急收发机发送确认消息。 应急收发器能够接收确认消息并终止遇险消息的传输。

    Correlation apparatus and method for accommodating spreading code frequency offset
    3.
    发明授权
    Correlation apparatus and method for accommodating spreading code frequency offset 有权
    适应扩展码频偏的相关装置和方法

    公开(公告)号：US08073084B1

    公开(公告)日：2011-12-06

    申请号：US12691578

    申请日：2010-01-21

    申请人： Thomas R. Giallorenzi ,  Johnny M. Harris ,  Dan M. Griffin ,  Richard Ertel ,  Eric K. Hall

    发明人： Thomas R. Giallorenzi ,  Johnny M. Harris ,  Dan M. Griffin ,  Richard Ertel ,  Eric K. Hall

    IPC分类号： H03D1/00

    CPC分类号： H04B1/7093 ,  H04B1/7075

    摘要： An apparatus and method for correlating a signal over a correlation interval while accommodating spreading code frequency offset is described. In one embodiment, the apparatus includes a plurality of correlators, where each correlator forms a correlation result corresponding to a unique code frequency offset hypothesis. Each correlator selects samples from a tapped delay line at a tap position moved along the delay line at a rate corresponding to the correlator unique code frequency offset hypothesis.

    摘要翻译： 描述了一种用于在适应扩展码频率偏移的同时在相关间隔上相关信号的装置和方法。 在一个实施例中，该装置包括多个相关器，其中每个相关器形成对应于唯一代码频率偏移假设的相关结果。 每个相关器以对应于相关器唯一代码频率偏移假设的速率沿着延迟线移动的抽头位置处的抽头延迟线选择样本。

    Spreading code hopping for synchronous DS-CDMA system to mitigate interference effects
    4.
    发明授权
    Spreading code hopping for synchronous DS-CDMA system to mitigate interference effects 失效

    公开(公告)号：US07099372B2

    公开(公告)日：2006-08-29

    申请号：US10037422

    申请日：2001-10-24

    申请人： Leon L. Nieczyporowicz ,  Richard B. Ertel ,  Thomas R. Giallorenzi ,  Eric K. Hall

    发明人： Leon L. Nieczyporowicz ,  Richard B. Ertel ,  Thomas R. Giallorenzi ,  Eric K. Hall

    IPC分类号： H04B1/707

    CPC分类号： H04B1/7097 ,  H01Q1/246 ,  H01Q21/205 ,  H04B1/707 ,  H04B2201/70703 ,  H04B2201/709709 ,  H04J13/0074 ,  H04L1/0003 ,  H04L1/0009 ,  H04W16/12

    摘要： Disclosed is a method for operating a code division multiple access communications system, and a system that operates in accordance with the method. The method operates within a coverage area of a base station by assigning a set of spreading codes to individual ones of a plurality of subscriber stations and then, during transmissions within the cell, by periodically hopping amongst spreading code within the set of spreading codes such that at any given time no two subscriber stations operate with the same spreading code. The set of spreading codes may include the all one's spreading code. The step of periodically hopping preferably changes from a currently used spreading code to a next spreading code at a symbol rate or at a multiple of the symbol rate. The set of spreading codes may be a hopped sub-set of a larger set of spreading codes, and in this case the method further operates to assign a non-hopped sub-set of the larger set of spreading codes to individual ones of the plurality of subscriber stations for use on a system access channel and/or on a system control channel or, more generally, for use on a non-traffic channel. The system may be a fixed data rate system or a variable data rate system. In the latter case the step of periodically hopping may change from a currently used spreading code to a next spreading code at the symbol rate, or at a multiple of the symbol rate of the lowest or the highest symbol rate users.

    Methods and apparatus implementing short and long code channel overlay for fast acquistion of long PN codes in spread spectrum communications systems
    6.
    发明授权
    Methods and apparatus implementing short and long code channel overlay for fast acquistion of long PN codes in spread spectrum communications systems 有权
    实现短码和长码信道覆盖的方法和装置，用于在扩频通信系统中快速获取长PN码

    公开(公告)号：US07701996B1

    公开(公告)日：2010-04-20

    申请号：US11259336

    申请日：2005-10-25

    申请人： Thomas R. Giallorenzi ,  Johnny M. Harris ,  Dan M. Griffen ,  Richard B. Ertel ,  Eric K. Hall

    发明人： Thomas R. Giallorenzi ,  Johnny M. Harris ,  Dan M. Griffen ,  Richard B. Ertel ,  Eric K. Hall

    IPC分类号： H04B1/69

    CPC分类号： H04B1/7075 ,  H04B2201/70715

    摘要： The present invention concerns methods and apparatus for use in a spread spectrum communications system. In particular, in a method of the present invention information useful for acquiring a target signal is selected; the information is incorporated in an acquisition signal; the acquisition signal is transmitted; the target signal is spread with a spreading code; and the target signal is transmitted. At a receiving node, the acquisition information useful for acquiring the target signal is recovered from the acquisition signal and used to acquire the target signal. Apparatus in accordance with the present invention implement methods of the present invention. The methods and apparatus of the present invention can be used in node- and network-discovery situations.

    摘要翻译： 本发明涉及在扩频通信系统中使用的方法和装置。 特别地，在本发明的方法中，选择用于获取目标信号的信息; 信息被并入采集信号中; 发送采集信号; 目标信号用扩展码扩展; 并发送目标信号。 在接收节点，从采集信号中恢复获取目标信号有用的获取信息，并用于获取目标信号。 根据本发明的装置实现本发明的方法。 本发明的方法和装置可用于节点和网络发现情况。

    Method and apparatus to initiate communications between an unknown node and an existing secure network
    8.
    发明授权
    Method and apparatus to initiate communications between an unknown node and an existing secure network 有权
    启动未知节点与现有安全网络之间的通信的方法和装置

    公开(公告)号：US07609751B1

    公开(公告)日：2009-10-27

    申请号：US11136783

    申请日：2005-05-24

    申请人： Thomas R. Giallorenzi ,  Johnny M. Harris ,  Eric K. Hall ,  Richard B. Ertel ,  Dan M. Griffin

    发明人： Thomas R. Giallorenzi ,  Johnny M. Harris ,  Eric K. Hall ,  Richard B. Ertel ,  Dan M. Griffin

    IPC分类号： H04B1/00

    CPC分类号： H04B1/7087 ,  H04B1/7075

    摘要： A first node initiating communications with a second node already in a secure network sends a discovery burst having a preamble portion and a payload portion. The preamble portion is sent at a varying frequency between high and low thresholds that are reflective of Doppler uncertainty between the nodes. The second node continuously listens at a frequency, termed an acquisition frequency. A data sequence in the preamble portion, known to the second node, is received and used to determine the receive instant in the preamble portion, and thereby compare against the known frequency ramp to determine the frequency at which the payload portion will be received. Preferably, the first node varies the preamble portion between thresholds more than once within the time span of a single preamble portion, and the preamble and payload portions are spread with different spreading codes. The preamble portion may also be disguised with noise generated by the first node.

    摘要翻译： 发起与已经在安全网络中的第二节点的通信的第一节点发送具有前导码部分和有效载荷部分的发现脉冲串。 前导码部分以反映节点之间的多普勒不确定性的高阈值和低阈值之间的变化频率发送。 第二个节点连续以一个频率收听，称为采集频率。 在第二节点已知的前同步码部分中的数据序列被接收并用于确定前同步码部分中的接收时刻，从而与已知的频率斜坡进行比较，以确定有效负载部分将被接收的频率。 优选地，第一节点在单个前导码部分的时间跨度内多于一次地改变阈值之间的前导码部分，并且前导码和有效载荷部分以不同的扩展码扩展。 前同步码部分也可以伪装成由第一节点产生的噪声。

    Method and apparatus for efficient carrier bin search for a composite spreading code
    9.
    发明授权
    Method and apparatus for efficient carrier bin search for a composite spreading code 有权
    用于复合扩展码的有效载波箱搜索的方法和装置

    公开(公告)号：US07436878B1

    公开(公告)日：2008-10-14

    申请号：US11136943

    申请日：2005-05-24

    申请人： Johnny M. Harris ,  Samuel C. Kingston ,  Thomas R. Giallorenzi ,  Eric K. Hall ,  Richard B. Ertel

    发明人： Johnny M. Harris ,  Samuel C. Kingston ,  Thomas R. Giallorenzi ,  Eric K. Hall ,  Richard B. Ertel

    IPC分类号： H04L27/30

    CPC分类号： H04L27/0014 ,  H04B1/70752 ,  H04B1/7087 ,  H04B1/7093 ,  H04L2027/0065

    摘要： A matched filter decorrelator is described for efficiently performing a carrier frequency search while despreading a P/N long code constructed from two or more constituent codes such as codes A, B, C. The received signal is phase rotated into a frequency bin and partially despread, preferably over all but one of the constituent codes. To despread the final constituent code, the partially despread signal is input in parallel into frequency bins, where a phase rotator sets each input to a different bin. The frequency bins are then despread in parallel over the final constituent code, and an energy peak in one accumulator indicates which bin is the carrier frequency. Alternatively, a Fourier transform could be used over each of the frequency bins. By partially despreading prior to division into carrier frequency bins, hardware and computational burden are reduced as compared to prior art decorrelators. The present invention is particularly apt for use with an acquisition burst in a secure network.

    摘要翻译： 描述了匹配滤波器去相关器，用于有效地执行载波频率搜索，同时对从诸如码A，B，C的两个或更多个成分码构成的P / N长码进行解扩。所接收的信号被相位旋转到频率仓并部分解扩 ，优选除了一个组成代码之外。 为了对最终的组成码进行解扩，部分解扩信号被并行地输入到频率仓中，其中相位旋转器将每个输入设置到不同的仓。 然后，频率仓在最终组成码上并行地解扩，并且一个累加器中的能量峰值指示哪个bin是载波频率。 或者，可以在每个频率仓上使用傅里叶变换。 通过在划分为载波频率仓之前进行部分解扩，与现有技术的去相关器相比，硬件和计算负担减小。 本发明特别适用于安全网络中的采集突发。

    Code assignment algorithm for synchronous DS-CDMA links with SDMA using estimated spatial signature vectors
    10.
    发明授权
    Code assignment algorithm for synchronous DS-CDMA links with SDMA using estimated spatial signature vectors 失效
    使用估计的空间特征向量与SDMA同步DS-CDMA链路的码分配算法

    公开(公告)号：US07050480B2

    公开(公告)日：2006-05-23

    申请号：US10037423

    申请日：2001-10-24

    申请人： Richard B. Ertel ,  Thomas R. Giallorenzi ,  Eric K. Hall

    发明人： Richard B. Ertel ,  Thomas R. Giallorenzi ,  Eric K. Hall

    IPC分类号： H04B1/69 ,  H04B1/707 ,  H04B1/713

    CPC分类号： H04W16/12 ,  H01Q1/246 ,  H01Q3/2617 ,  H01Q21/205 ,  H04B1/707 ,  H04B2201/70703 ,  H04B2201/709709 ,  H04J13/0074 ,  H04J13/16 ,  H04L1/0003 ,  H04L1/0009 ,  H04W16/02

    摘要： A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system. The method operates, within a coverage area of a base station (BS) or radio base unit (RBU) having a multi-element antenna array, for estimating a SSV for individual ones of a plurality of active subscriber stations (SSs) and assigns a spreading code to a subscriber station (SS) that minimizes the similarity of the determined SSVs of the SSs in a spreading code set. A metric used to measure the similarity of the spatial signature vectors of the SSs comprises the squared sum of the inner products of same code SSs' SSV with a current SS's SSV. The step of assigning includes calculating the magnitude of the squared inner product of the SSVs of all pairs of active SSs; using the calculated values for determining ξn(c) for each spreading code that is not already used some specified maximum number of times; and assigning to a SS the spreading code with a minimum ξn(c).

    摘要翻译： 公开了一种用于操作同步空分多址，码分多址通信系统的方法。 该方法在具有多元天线阵列的基站（BS）或无线电基站单元（RBU）的覆盖区域内操作，用于估计多个活动用户站（SS）中的各个SSV的SSV，并分配 将扩展码扩展到用户站（SS），其最小化所确定的扩展码组中的SS的SSV的相似度。 用于测量SS的空间签名矢量的相似性的度量包括相同代码SSs SSV与当前SS的SSV的内积的平方和。 分配步骤包括计算所有活动SS对的SSV的平均内积的大小; 对于尚未使用的每个扩展码使用计算值来确定xi （c）一些指定的最大次数; 并且向SS分配具有最小xi （c）的扩展码。