公开(公告)号：US20180183489A1

公开(公告)日：2018-06-28

申请号：US15803220

申请日：2017-11-03

申请人： Sierra Nevada Corporation

发明人： Donald Rasmussen

IPC分类号： H04B1/711 ,  H04L1/00 ,  H04B1/713 ,  H04B1/71 ,  H04B1/10

CPC分类号： H04B1/711 ,  H04B1/1027 ,  H04B1/7073 ,  H04B1/7095 ,  H04B1/7101 ,  H04B1/713 ,  H04B1/7163 ,  H04B10/613 ,  H04L1/0071

摘要： A system is provided that can introduce data redundancy into wireless communications, and in particular ultra-wideband (UWB) wireless communications to increase the communication range when transmitting data that has low transmission rates. Multipath degradation, introduced by the extended communications range, can be mitigated by frequency hopping between the orthogonal frequency-division multiplexed symbols of the ultra-wideband waveform. Frequency hopping can place adjacent symbols in different frequency channels for filtering. Data redundancy can be expanded in the time domain and/or the frequency domain, resulting in extended range.

公开(公告)号：US08345714B2

公开(公告)日：2013-01-01

申请号：US12556161

申请日：2009-09-09

申请人： Dong Ryeol Ryu ,  Kwang Man Ok

发明人： Dong Ryeol Ryu ,  Kwang Man Ok

IPC分类号： H04J3/06

CPC分类号： H04B1/7083 ,  H04B1/7095

摘要： A cell search method and apparatus for an asynchronous mobile communication system are provided. A Secondary Synchronization Code (SSC) correlator despreads a signal at every slot boundary in accordance with a z-sequence to output a SSC correlation value. The signal is received over a first symbol duration. A Primary Synchronization Code (PSC) correlator despreads the received signal in accordance with a PSC to output a PSC correlation value. A dot product calculator performs dot product calculation between the SSC correlation value and the PSC correlation value to output a correlation result of the SSC. A frame synchronization detector extracts frame synchronization information from the correlation result.

摘要翻译： 提供了一种用于异步移动通信系统的小区搜索方法和装置。 次同步码（SSC）相关器根据z序列在每个时隙边界解扩信号以输出SSC相关值。 在第一符号持续时间内接收信号。 主同步码（PSC）相关器根据PSC对接收到的信号进行解扩以输出PSC相关值。 点积计算器在SSC相关值和PSC相关值之间进行点积计算，以输出SSC的相关结果。 帧同步检测器从相关结果中提取帧同步信息。

公开(公告)号：US08340159B2

公开(公告)日：2012-12-25

申请号：US12087941

申请日：2006-01-27

申请人： Benyuan Zhang ,  Paul Gothard Knutson

发明人： Benyuan Zhang ,  Paul Gothard Knutson

IPC分类号： H04B1/00

CPC分类号： H04B1/70775 ,  H04B1/70757 ,  H04B1/7095

摘要： A multipath searcher and method includes a programmable decimation filter configured to adjust a sample rate of a received pilot signal. A plurality of correlators is configured to compare the received pilot signal to a reference code in a first mode and in a second mode. The first mode includes a low resolution search of a search window performed such that the plurality of correlators encompass an entire search window concurrently and the plurality of correlators receives a delayed reference code delayed to correspond with a portion of the search window in which a corresponding correlator performs correlation to identify peaks in the received pilot signal. The second mode includes a high resolution search of a refined search window only at or near identified peaks discovered in the first mode. The high resolution search is focused at the peak location by adjusting delays in the plurality of correlators.

摘要翻译： 多路径搜索器和方法包括可编程抽取滤波器，其被配置为调整接收到的导频信号的采样率。 多个相关器被配置为将接收的导频信号与第一模式和第二模式中的参考码进行比较。 第一模式包括执行的搜索窗口的低分辨率搜索，使得多个相关器同时包含整个搜索窗口，并且多个相关器接收被延迟以与搜索窗口的一部分相对应的延迟参考码，其中相应的相关器 执行相关性以识别接收到的导频信号中的峰值。 第二模式包括仅在第一模式中发现的识别峰处或附近的精确搜索窗口的高分辨率搜索。 高分辨率搜索通过调整多个相关器中的延迟来聚焦在峰值位置。

公开(公告)号：US08121228B2

公开(公告)日：2012-02-21

申请号：US11267537

申请日：2005-11-04

申请人： Robert M. Gorday

发明人： Robert M. Gorday

IPC分类号： H04B1/00 ,  H04L27/06

CPC分类号： H04B1/707 ,  H04B1/7095

摘要： A detector (109) and corresponding method is configured for detecting presence of a data frame. The detector includes a first correlator (123) that is configured to provide a first plurality of correlations corresponding to similarity between data as received and first information, e.g., an ordered set of coefficients, that denotes the data frame and a second correlator (125) that is configured to provide a second plurality of correlations corresponding to similarity between the data as received and second information, e.g., another ordered set of coefficients, that denotes the data frame, where the second information includes a portion of the first information. Further included is decision logic (129) coupled to the first correlator and the second correlator, where the decision logic is configured to provide an indication (111) that the data frame is present based on the first plurality of correlations and the second plurality of correlations.

摘要翻译： 检测器（109）和相应的方法被配置用于检测数据帧的存在。 检测器包括第一相关器（123），其被配置为提供对应于接收的数据与第一信息（例如，表示数据帧的有序系数集合）和第二相关器（125）之间的相似性的第一多个相关性， 被配置为提供对应于所接收的数据与第二信息之间的相似性的第二多个相关性，例如表示数据帧的另一有序系数集合，其中第二信息包括第一信息的一部分。 还包括耦合到第一相关器和第二相关器的判决逻辑（129），其中判定逻辑被配置为基于第一多个相关性和第二多个相关性来提供数据帧存在的指示（111） 。

公开(公告)号：US20110193745A1

公开(公告)日：2011-08-11

申请号：US13090703

申请日：2011-04-20

申请人： Michael AMMANN

发明人： Michael AMMANN

IPC分类号： G01S19/37

CPC分类号： H04B1/70752 ,  G01S19/29 ,  H04B1/7095 ,  H04B2201/70715

摘要： An acquisition unit of a GNSS receiver base band circuit includes an integrator with a number of preprocessors where an incoming digital signal is mixed with different frequency signals to compensate at least in part for clock drift and Doppler shifts. The resulting digital signals are, after an accumulation step reducing sample frequency, integrated over an integration period extending over several basic intervals of the length of a basic sequence characteristic for a GNSS satellite, so that samples separated by a multiple of the basic interval are superposed. The resulting data sequence of 1,023 digital values is stored in one of two memories and then, in mixers, sequentially shifted by post-integration frequencies which are multiples of the inverse of the length of the basic interval. The pre-integration frequencies employed in the preprocessors deviate, with one possible exception, from the post-integration frequencies and are usually smaller.

摘要翻译： GNSS接收器基带电路的获取单元包括具有多个预处理器的积分器，其中输入数字信号与不同的频率信号混合，以至少部分地补偿时钟漂移和多普勒频移。 所产生的数字信号在累积步骤降低采样频率之后，在对于GNSS卫星的基本序列特征的长度的几个基本间隔延伸的积分周期内积分，使得由基本间隔的倍数分隔的样本被叠加 。 所得到的1,023个数字值的数据序列被存储在两个存储器中的一个中，然后在混频器中，顺序地按照基本间隔长度的倒数的倍数的积分后频率移位。 预处理器中使用的预积分频率与后期积分频率偏离一个可能的例外，通常较小。

公开(公告)号：US07773696B1

公开(公告)日：2010-08-10

申请号：US11644144

申请日：2006-12-22

申请人： Donald John Rasmussen

发明人： Donald John Rasmussen

IPC分类号： H04L27/12

CPC分类号： H04L27/2014 ,  H04B1/7093 ,  H04B1/7095 ,  H04B2201/709709

摘要： A transmitter is configured to transmit a time of arrival (TOA) message to a receiver applying a quadrature multiple frequency ranging (QMFR) algorithm for separating multiple path signal components. The transmitter includes (1) a modulator for generating a quasi-band limited minimum shift keyed (QBL-MSK) signal, (2) a serial formatter for generating a serial QBL-MSK (SQBL-MSK) signal, and (3) a switch for disabling the serial formatter, during a time that the TOA message is being transmitted to the receiver. The receiver includes (1) a matched filter for separating a data packet with the TOA message into in-phase (I) and quadrature (Q) spreading sequences, (2) an even sample mapping section, coupled to the matched filter, for outputting the even samples of the I and Q spreading sequences, (3) an odd sample mapping section, coupled to the matched filter, for outputting the odd samples of the I and Q spreading sequences, and (4) sliding correlator banks for receiving the even samples of the I and Q spreading sequences and the odd samples of the I and Q spreading sequences and outputting despread even I and Q samples and despread odd I and Q samples to a QMFR algorithm for separating multiple path signal components.

摘要翻译： 发射机被配置为向接收机发送到达时间（TOA）消息，所述接收机应用用于分离多路径信号分量的正交多频测距（QMFR）算法。 发射机包括（1）用于产生准带限制最小移位键控（QBL-MSK）信号的调制器，（2）用于产生串行QBL-MSK（SQBL-MSK）信号的串行格式化器，以及（3） 在TOA消息被发送到接收器的时间内禁止串行格式器的切换。 接收机包括：（1）用于将具有TOA消息的数据分组分离成同相（I）和正交（Q）扩展序列的匹配滤波器，（2）耦合到匹配滤波器的偶数样本映射部分，用于输出 I和Q扩展序列的偶数样本，（3）耦合到匹配滤波器的奇数样本映射部分，用于输出I和Q扩展序列的奇数样本，以及（4）滑动相关器组用于接收偶数 I和Q扩展序列的样本和I和Q扩展序列的奇数样本，并输出解扩的偶数I和Q采样，并将奇数I和Q采样解扩展到用于分离多路径信号分量的QMFR算法。

公开(公告)号：US07729413B2

公开(公告)日：2010-06-01

申请号：US10835948

申请日：2004-04-30

申请人： Sanjai Kohli ,  Steven Chen ,  Charles R. Cahn ,  Mangesh Chansarkar ,  Greg Turetsky

发明人： Sanjai Kohli ,  Steven Chen ,  Charles R. Cahn ,  Mangesh Chansarkar ,  Greg Turetsky

IPC分类号： H04B1/69 ,  H04L27/06

CPC分类号： H04B1/7085 ,  G01C21/26 ,  G01C22/00 ,  G01S19/11 ,  G01S19/22 ,  G01S19/235 ,  G01S19/29 ,  G01S19/30 ,  G01S19/34 ,  G01S19/37 ,  G01S19/47 ,  G01S19/49 ,  G01S19/50 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7095 ,  H04B1/7115 ,  H04B7/216 ,  H04B2001/70706 ,  H04B2201/70715

摘要： A system and a method to track GPS (Global Positioning System) satellite signal in a GPS receiver that includes an expanded capture window to rapidly reacquire the satellite signal after the satellite signal has been obstructed or when there is other type of signal loss. The expanded capture window includes a plurality of additional early and late correlations for maintaining synchronization of the GPS signal with a generated replica signal when positional error has accumulated during the time of the signal loss. The plurality of additional early and late correlations may be delayed from each other by a multiple of a fraction of a chip and may be performed in one or multiple channels of the GPS receiver. The adjoining code samples in the replica signal may also be offset by a fraction of a chip or by a multiple of the fraction of a chip.

摘要翻译： 一种在GPS接收机中跟踪GPS（全球定位系统）卫星信号的系统和方法，其包括扩展的捕获窗口，以在卫星信号被阻塞之后或当存在其它类型的信号丢失时快速重新获取卫星信号。 扩展的捕获窗口包括多个附加的早期和晚期相关性，用于在信号丢失时间期间积累位置误差时，保持GPS信号与生成的复制信号的同步。 多个附加的早期和晚期相关可以由芯片的一小部分的倍数彼此延迟，并且可以在GPS接收机的一个或多个信道中执行。 复制信号中的相邻代码样本也可以被芯片的一部分或芯片的分数的倍数所抵消。

公开(公告)号：US07711036B2

公开(公告)日：2010-05-04

申请号：US11220547

申请日：2005-09-08

申请人： Takamitsu Hafuka

发明人： Takamitsu Hafuka

IPC分类号： H04B1/00

CPC分类号： H04B1/7075 ,  H04B1/7095

摘要： In a synchronous acquisition method of a spread spectrum code, a digital code sequence is generated based on a received radio communication signal. The digital code sequence defines a spread spectrum code which includes a preamble symbol. A plurality of correlation signals are generated based on the spread spectrum code of the digital code sequence. A detection signal is generated in accordance with the correlation signal which corresponds to the preamble symbol. A timing control signal is generated in accordance with the detection signal. A demodulation signal is generated based on the correlation signals and in accordance with the timing control signal. A correction signal is generated based on the demodulation signal. A corrected timing control signal is generated based on the timing control signal and the correction signal, such that the demodulation signal corresponds to the preamble symbol.

摘要翻译： 在扩频码的同步采集方法中，基于所接收的无线电通信信号生成数字码序列。 数字码序列定义包括前同码符号的扩频码。 基于数字码序列的扩频码生成多个相关信号。 根据对应于前导符号的相关信号产生检测信号。 根据检测信号产生定时控制信号。 基于相关信号并根据定时控制信号产生解调信号。 基于解调信号产生校正信号。 基于定时控制信号和校正信号产生校正的定时控制信号，使得解调信号对应于前导符号。

公开(公告)号：US07616681B2

公开(公告)日：2009-11-10

申请号：US12398344

申请日：2009-03-05

申请人： Young-Joon Song

发明人： Young-Joon Song

IPC分类号： H04B1/00

CPC分类号： H04L25/0226 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70755 ,  H04B1/709 ,  H04B1/7095 ,  H04B1/7115 ,  H04B7/2668 ,  H04B2201/70701 ,  H04J13/18 ,  H04L25/0224

摘要： The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle shifts are obtained. This property can be used to slot-by-slot, double-check frame synchronization timing, single frame synchronization and/or channel estimation and allows reduction of the synchronization search time. Further, the present invention allows a simpler construction of a correlator circuit for a receiver. A frame synchronization apparatus and method using an optimal pilot pattern is used in a wide band code division multiple Access (W-CDMA) next generation mobile communication system.

公开(公告)号：US07603133B2

公开(公告)日：2009-10-13

申请号：US11110164

申请日：2005-04-20

申请人： Aykut Bultan ,  John W. Haim ,  Donald Grieco

发明人： Aykut Bultan ,  John W. Haim ,  Donald Grieco

IPC分类号： H04B15/00

CPC分类号： H04B1/7117 ,  H04B1/7073 ,  H04B1/70754 ,  H04B1/708 ,  H04B1/7095 ,  H04B2201/70701

摘要： A method for determining the validity of a most significant path in a wireless communication system wherein data is transmitted in frame units in a multipath environment begins by accumulating a correlated data sequence N times, each time at a frame offset apart from the previous time. A preliminary noise estimate (PNE) is calculated as an average of the accumulated data values. A preliminary noise threshold (PNT) is calculated according to the equation C1×PNE. A final noise estimate (FNE) is calculated as the average of accumulated data values below the PNT. A final noise threshold (FNT) is calculated according to the equation C2×FNE. The validity of the most significant path is determined if the most significant path value is greater than the FNT.

摘要翻译： 用于确定无线通信系统中最重要路径的有效性的方法，其中以多路径环境中的帧为单位传输数据的开始是通过累积相关数据序列N次，每次与之前的时间相隔一帧偏移。 初步噪声估计（PNE）被计算为累积数据值的平均值。 根据等式C1xPNE计算初步噪声阈值（PNT）。 最终噪声估计（FNE）被计算为低于PNT的累积数据值的平均值。 根据等式C2xFNE计算最终噪声阈值（FNT）。 如果最显着的路径值大于FNT，则确定最重要路径的有效性。