-
公开(公告)号：US4930139A
公开(公告)日：1990-05-29
申请号：US359206
申请日：1989-05-31
IPC分类号： H04B1/707 , H04B1/7093 , H04J13/00
CPC分类号： H04B1/7093 , H04B1/707 , H04J13/00
摘要： The spread spectrum digital communication system includes data input devices for generating digital information signals to be transmitted using radio signals. A chip stream generator converts the data bits into chip streams that are either complemented or not complemented via an exclusive-OR gate, depending on the data bits. A scrambler further randomizes the chip stream for transmission. The receiver includes a descrambler and a correlator or digital matched filter for detecting the data signal. A modified receiver includes a sampler for sampling the scrambled signal at a rate which is the multiple of the chip rate thereby eliminating any need for recovering the chip clock. Another modified version includes a receiver having means for generating multi-level signals indicating the quality of the probable detection.
-
公开(公告)号：US09118753B2
公开(公告)日：2015-08-25
申请号：US13485090
申请日：2012-05-31
摘要： A system for testing a communications network includes a controller having a computing device with a controller application and an operator having a microcontroller and a device interface module controlled by the microcontroller. A handheld communications device is operatively connected to the operator through the device interface module and adapted to communicate over the communications network being tested. The controller and the operator are connected by an out-of-band wireless control link to allow communication therebetween outside of the communications network being tested. The operator is adapted to receive commands from the controller over the out-of-band control link and, upon receipt of a command from the controller over the out-of-band control link, to initiate in-band communication on the handheld communications device over the communications network through the device interface module.
摘要翻译： 用于测试通信网络的系统包括具有控制器应用的计算设备的控制器和具有由微控制器控制的微控制器和设备接口模块的操作者。 手持通信设备通过设备接口模块可操作地连接到操作者，并适于通过被测试的通信网络进行通信。 控制器和操作员通过带外无线控制链路连接，以允许在被测通信网络之外的通信。 运营商适于通过带外控制链路从控制器接收命令，并且在通过带外控制链路从控制器接收到命令时，在手持通信设备上发起带内通信 通过设备接口模块通过通信网络。
-
公开(公告)号：US20130326089A1
公开(公告)日：2013-12-05
申请号：US13485090
申请日：2012-05-31
IPC分类号： G06F3/00
摘要： A system for testing a communications network includes a controller having a computing device with a controller application and an operator having a microcontroller and a device interface module controlled by the microcontroller. A handheld communications device is operatively connected to the operator through the device interface module and adapted to communicate over the communications network being tested. The controller and the operator are connected by an out-of-band wireless control link to allow communication therebetween outside of the communications network being tested. The operator is adapted to receive commands from the controller over the out-of-band control link and, upon receipt of a command from the controller over the out-of-band control link, to initiate in-band communication on the handheld communications device over the communications network through the device interface module.
摘要翻译： 用于测试通信网络的系统包括具有控制器应用的计算设备的控制器和具有由微控制器控制的微控制器和设备接口模块的操作者。 手持通信设备通过设备接口模块可操作地连接到操作者，并适于通过被测试的通信网络进行通信。 控制器和操作员通过带外无线控制链路连接，以允许在被测通信网络之外的通信。 运营商适于通过带外控制链路从控制器接收命令，并且在通过带外控制链路从控制器接收到命令时，在手持通信设备上发起带内通信 通过设备接口模块通过通信网络。
-
4.发明授权公开(公告)号：US08363690B2
公开(公告)日：2013-01-29
申请号：US10229850
申请日：2002-08-28
CPC分类号： H04B1/70752 , H04B1/70735 , H04B1/7077
摘要： A codeword synthesizing system and a correlation system for use with a spread spectrum communications system. In one embodiment, the codeword synthesizing system typically associated with a transmitter includes a base sequence generating subsystem, a modifier sequence generating subsystem and a concatenating subsystem. The base sequence generating subsystem is configured to create base sequences having a length less than a synthesized codeword. The modifier sequence generating subsystem is configured to create a modifier sequence, and the concatenating subsystem is configured to produce the synthesized codeword by multiplying each of the base sequences by an element of the modifier sequence. In one embodiment, the correlation system typically associated with a receiver includes a partial correlating subsystem, a memory subsystem and a combining subsystem. The partial correlating subsystem correlates base sequences of a synthesized codeword to a template and derives multiple partially correlated resultants. The memory subsystem temporarily stores the partially correlated resultants, and the combining subsystem sums weighted values of the partially correlated resultants to provide a correlated value of the synthesized codeword.
摘要翻译： 用于扩展频谱通信系统的码字合成系统和相关系统。 在一个实施例中，典型地与发射机相关联的码字合成系统包括基本序列生成子系统，修改序列生成子系统和级联子系统。 基本序列生成子系统被配置为创建长度小于合成码字的碱基序列。 修饰符序列生成子系统被配置为创建修饰符序列，并且连接子系统被配置为通过将每个基本序列乘以修饰符序列的元素来产生合成的码字。 在一个实施例中，通常与接收机相关联的相关系统包括部分相关子系统，存储器子系统和组合子系统。 部分相关子系统将合成码字的基本序列与模板相关联，并导出多个部分相关的结果。 存储器子系统临时存储部分相关的结果，并且组合子系统对部分相关的结果的加权值求和，以提供合成码字的相关值。
-
公开(公告)号：US07110768B1
公开(公告)日：2006-09-19
申请号：US09455019
申请日：1999-12-06
IPC分类号： H04Q7/20
CPC分类号： H04W16/18
摘要： The present invention provides an apparatus and system for accurately predicting and evaluating cellular system performance before an actual system is installed at a site. In accordance with an embodiment of the invention, only two persons (or under certain conditions, as few as one) are required to operate the portable measurement and antenna placement (MAP) tools of the invention, and evaluate system performance (e.g., voice quality) at varied locations of a site without the system being in place. A user can measure out the size of cells using a bar graph display that shows the range of acceptable signal levels for the system, and an audible warning tone that signals the user when the cell edge has been exceeded. In addition, other quality determinative system parameters (e.g., bit error rate (BER), etc.) can be evaluated simultaneously with voice quality and average received signal strength.
摘要翻译： 本发明提供了一种用于在实际系统安装在现场之前准确地预测和评估蜂窝系统性能的装置和系统。 根据本发明的实施例，仅需要两个人（或在某些条件下，少至一个）来操作本发明的便携式测量和天线放置（MAP）工具，并且评估系统性能（例如，语音质量 ）在没有系统到位的场所的不同位置。 用户可以使用条形图显示来测量单元格的大小，该条形图显示系统可接受的信号电平的范围，以及当超过单元格边缘时向用户发出的可听到的警告音。 此外，可以与语音质量和平均接收信号强度同时评估其他质量确定系统参数（例如，误码率（BER）等）。
-
公开(公告)号：US4477918A
公开(公告)日：1984-10-16
申请号：US310854
申请日：1981-10-13
CPC分类号： H03K21/12
摘要： A system for reading out the contents of multiple counters onto a common bus comprising a plurality of synchronous binary counters arranged in a ring with each counter having N corresponding stages each having an output terminal on which appears the contents of the stage, an input terminal, and a clock pulse input terminal, with each stage responsive to a clock pulse supplied to its clock input terminal to transfer the signal logic level on its input terminal to its output terminal and with the output terminals of the stages of a given counter comprising the common bus. Also provided is a clock pulse source for supplying clock pulses to all of the clock input terminals and a switching signal source for generating a switching pulse. A switch associated with each stage is responsive to the switching pulse to connect the output terminal of each stage to the input terminal of the corresponding stage of the next adjacent counter in the ring of counters.
摘要翻译： 一种用于将多个计数器的内容读出到公共总线上的系统，包括以每个计数器排列成环的多个同步二进制计数器，每个计数器具有N个对应级，每个具有一个输出端，出现该级的内容，一个输入端， 和一个时钟脉冲输入端，每个级响应提供给其时钟输入端的时钟脉冲，将其输入端上的信号逻辑电平转移到其输出端，并且给定计数器的级的输出端包括公共端 总线。 还提供了用于向所有时钟输入端提供时钟脉冲的时钟脉冲源和用于产生开关脉冲的开关信号源。 与每个级相关联的开关响应于开关脉冲，以将每个级的输出端子连接到计数器环中的下一个相邻计数器的相应级的输入端子。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.013 秒)
