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11. 发明授权

US5574754A Sliding correlator 失效
标题翻译：滑动相关器
公开(公告)号：US5574754A
公开(公告)日：1996-11-12
申请号：US556439
申请日：1995-11-09
申请人： Takao Kurihara , Yoshitaka Uchida , Masahiro Hamatsu
发明人： Takao Kurihara , Yoshitaka Uchida , Masahiro Hamatsu
IPC分类号： H04J13/00 , H04B1/7095 , H04L7/04 , H04L7/00
CPC分类号： H04B1/7075 , H04B1/708 , H04B1/7085 , H04B1/7095 , H04L7/043
摘要： A sliding correlator for initial synchronization and tracking of a SS (Spread Spectrum)-modulated signal containing a transmitted pseudo noise (PN) code, digitizes the received signal, and attempts to correlate the PN code in the received signal with a locally generated reference PN code. Initial synchronization employs correlation with three reference PN codes, an early, center and late channel. When correlation is found between the transmitted PN code and one of the reference PN codes, the three reference PN codes are shifted to align the center channel with the correlated channel and to displace the early and late channel reference PN codes to one side and the other of the center channel. In one embodiment, the displacement is one-third chip, and in another embodiment, the displacement is one-half chip. In one embodiment for initial tracking, the three channels are displaced one chip from each other and, after failure to attain correlation in any of the channels, the three channels are displaced three chips to again seek synchronization. Initial Tracking, following initial synchronization, detects changes in correlation in the three channels, and adjust the frequency and/or the phase of the three reference PN codes to return the reference PN codes into a desired relationship with the transmitted PN code. In one embodiment of tracking, clockwise and counterclockwise cyclic permutation of the three reference PN codes is used to maintain alignment between the three reference PN codes and the transmitted PN code. In other embodiments, the condition of correlation, or lack thereof, in each channel is stored in a register and shifting of the reference PN codes is performed in response to the status of the register.
摘要翻译：用于初始同步和跟踪包含发射伪噪声（PN）码的SS（扩频））调制信号的滑动相关器对接收到的信号进行数字化，并尝试将接收信号中的PN码与本地生成的参考PN 码。初始同步采用与三个参考PN码（早期，中心和晚期信道）的相关性。当在所发送的PN码和参考PN码之一中发现相关时，三个参考PN码被移位以使中心信道与相关信道对准，并将早期和晚期信道参考PN码移位到一侧，而另一个的中心渠道。在一个实施例中，位移是三分之一芯片，在另一个实施例中，位移是二分之一芯片。在初始跟踪的一个实施例中，三个信道彼此一个位移，并且在不能在任何信道中获得相关性之后，三个信道被移位三个码片以再次寻找同步。初始跟踪在初始同步之后，检测三个通道中相关性的变化，并调整三个参考PN代码的频率和/或相位，以将参考PN代码返回到与发送的PN码的期望关系。在跟踪的一个实施例中，使用三个参考PN码的顺时针和逆时针循环置换来保持三个参考PN码和所发送的PN码之间的对准。在其他实施例中，每个信道中的相关条件或不存在的条件存储在寄存器中，并且响应于寄存器的状态执行参考PN码的移位。

12. 发明授权

US10637531B2 Extended range communications for ultra-wideb and network nodes 有权
公开(公告)号：US10637531B2
公开(公告)日：2020-04-28
申请号：US16289041
申请日：2019-02-28
申请人： SIERRA NEVADA CORPORATION
发明人： Donald Rasmussen
IPC分类号： H04B1/711 , H04L1/00 , H04B1/713 , H04B1/10 , H04B1/71 , H04L1/18 , H04L1/08 , H04B1/7073 , H04B10/61 , H04B1/7095 , H04B1/7163
CPC分类号： H04B1/711 , H04B1/1027 , H04B1/7101 , H04B1/713 , H04L1/0002 , H04L1/004 , H04L1/0071 , H04L1/08 , H04L1/1819 , H04B1/7073 , H04B1/7095 , H04B1/7163 , H04B10/613
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.

13. 发明授权

US10447340B2 Devices and methods employing hermetic transforms for encoding and decoding digital information in spread-spectrum communication systems 有权
公开(公告)号：US10447340B2
公开(公告)日：2019-10-15
申请号：US15389927
申请日：2016-12-23
申请人： VertoCOMM, Inc.
发明人： Harvey C. Woodsum
IPC分类号： H04B1/7093 , H04B1/707 , H04B1/7095 , H04B1/7103 , H04L27/18 , H04L27/34
摘要： In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag.

14. 发明申请

US20180316370A1 DISTORTION CANCELLATION DEVICE AND METHOD 审中-公开
公开(公告)号：US20180316370A1
公开(公告)日：2018-11-01
申请号：US15899405
申请日：2018-02-20
申请人： FUJITSU LIMITED
发明人： Mitsuharu Hamano
IPC分类号： H04B1/10 , H04B1/7073 , H04B1/7075 , H04B1/7093 , H04B1/7095
CPC分类号： H04B1/1036 , H04B1/70735 , H04B1/7075 , H04B1/7093 , H04B1/7095
摘要： There is provided a distortion cancellation device including a memory, and a processor coupled to the memory and the processor configured to, acquire a transmission signal to be wirelessly transmitted, acquire a reception signal to which an intermodulation signal generated due to the transmission signal wirelessly transmitted is added, generate a replica signal of the intermodulation signal from the transmission signal, detect an arrival time of the intermodulation signal, based on a correlation operation using a sample of a signal sequence of the replica signal and a sample of the acquired reception signal, the signal sequence having a duration corresponding to a detection range, and cancel the intermodulation signal in the reception signal, based on the detected arrival time.

15. 发明授权

US08811143B2 Software based spread spectrum signal processing 有权
标题翻译：基于软件的扩频信号处理
公开(公告)号：US08811143B2
公开(公告)日：2014-08-19
申请号：US12939072
申请日：2010-11-03
申请人： Christian Stahlberg , Per-Ludvig Normark
发明人： Christian Stahlberg , Per-Ludvig Normark
IPC分类号： H04J11/00 , H04B1/7077 , H04B1/707 , H04L29/06 , H04B1/7095
CPC分类号： H04L65/607 , H04B1/707 , H04B1/7077 , H04B1/7095 , H04B2201/7071 , H04B2201/70715
摘要： A digital processing unit for use in a spread spectrum signal receiver, the digital processing unit being adapted to receive an incoming stream of data samples and in response thereto produce a decoded signal, the digital processing unit comprising a correlation module adapted to correlate data blocks formed from the incoming stream of data samples with a local code replica segment to produce a first number of intermediate accumulation results and an aggregation module adapted to receive the first number of intermediate accumulation results and to combine the first number of consecutive ones of said intermediate accumulation results to form a target number of aggregated accumulation results, said target number being less than or equal to the first number.
摘要翻译：一种用于扩展频谱信号接收机的数字处理单元，所述数字处理单元适于接收数据样本的输入流，并且响应于此产生解码信号，所述数字处理单元包括相关模块，所述相关模块适于将形成的数据块相关联从具有本地代码副本段的输入数据样本流中产生第一数量的中间累积结果，以及聚合模块，其适于接收第一数量的中间累积结果，并将所述中间累积结果的第一数量的连续的一个形成聚合累积结果的目标数，所述目标数小于或等于第一个数。

16. 发明授权

US6128331A Correlation system for use in wireless direct sequence spread spectrum systems 失效
标题翻译：用于无线直接序列扩频系统的相关系统
公开(公告)号：US6128331A
公开(公告)日：2000-10-03
申请号：US335328
申请日：1994-11-07
申请人： Paul F. Struhsaker , Jane L. Smith
发明人： Paul F. Struhsaker , Jane L. Smith
IPC分类号： H04B1/7075 , H04B1/708 , H04B1/7095 , A61F2/06 , H04L27/30
CPC分类号： H04B1/70752 , H04B1/708 , H04B1/7095 , H04B1/70751 , H04B2201/70707
摘要： A correlation system for use in wireless direct sequence spread spectrum systems includes a RF down converter which receives an encoded RF signal and generates therefrom analog in-phase (I) and quadrature (Q) signal components. These components are digitized and the digitized signals are then passed to each of the high precision correlator circuit and a low precision correlator circuit. The low precision correlator circuit consist of a bank of a plurality of low precision correlators which receive the I and Q signal components as inputs and correlates the same with progressively phase shifted or delay pseudo noise (PN) codes. A low precision correlation circuit locks on to the appropriate PN code phase shift or delay and applies the same as a reference PN code to the high precision correlation circuit for data acquisition and demodulization.
摘要翻译：用于无线直接序列扩频系统的相关系统包括RF下变频器，其接收经编码的RF信号并由其产生模拟同相（I）和正交（Q）信号分量。这些组件被数字化，然后数字化的信号被传递到每个高精度相关器电路和低精度相关器电路。低精度相关器电路由多个低精度相关器组组成，其接收I和Q信号分量作为输入，并将其与渐进相移或延迟伪噪声（PN）码相关。低精度相关电路锁定到适当的PN码相移或延迟，并将其作为参考PN码应用于用于数据采集和解调的高精度相关电路。

17. 发明授权

US5111478A Method and apparatus for providing signal synchronization in a spread spectrum communication system 失效
标题翻译：用于在扩频通信系统中提供信号同步的方法和装置
公开(公告)号：US5111478A
公开(公告)日：1992-05-05
申请号：US648472
申请日：1991-01-31
申请人： James A. McDonald
发明人： James A. McDonald
IPC分类号： H04B1/7075 , H04B1/7095
CPC分类号： H04B1/70754 , H04B1/7095
摘要： A method and apparatus is provided for synchronizing a spread spectrum communication site. The communication site receives a spread message signal from over a radio communication channel. Subsequently, the communication site synchronizes the received spread message signal with an estimate of the received spread message signal. The estimated received signal is a function of a predetermined message signal and a predetermined spreading code. The received and the estimated received spread message signals are synchronized by using a sliding correlator to incrementally increase the phase shift between the received and the estimated received spread message signal until the received and the estimated received spread message signals are synchronized. The communication site limits the increase of the phase shift between the received and the estimated received spread message signal to a predetermined maximum phase shift magnitude which is derived from known operating environment parameters of the spread spectrum communication site.
摘要翻译：提供了一种使扩频通信站点同步的方法和装置。通信站点通过无线电通信信道接收扩展消息信号。随后，通信站点将所接收的扩展消息信号与所接收的扩展消息信号的估计值进行同步。估计的接收信号是预定消息信号和预定扩展码的函数。接收的和估计的接收扩展消息信号通过使用滑动相关器来逐步增加接收和估计的接收扩展消息信号之间的相移直到接收和估计的接收扩展消息信号同步为止来同步。通信站点将接收和估计的接收扩展消息信号之间的相移的增加限制为从扩频通信站点的已知操作环境参数导出的预定最大相移幅度。

18. 发明授权

US11005521B2 Efficient handling of clock offset in spread spectrum decoders 有权
公开(公告)号：US11005521B2
公开(公告)日：2021-05-11
申请号：US16779880
申请日：2020-02-03
申请人： Cisco Technology, Inc.
发明人： Knut Inge Hvidsten , Michael A. Ramalho , Ragnvald Balch Barth
IPC分类号： H04B1/7095 , H04L7/00 , H04B1/708
摘要： Doppler correlators are configured to receive samples of a signal sampled based on a frequency. Each Doppler correlator includes successive butterfly elements. Each butterfly element includes cross-coupled first and second branches that include a sample delay that doubles for each successive butterfly element, and a sample inversion selectively placed in one of the first and second branches to encode into the successive butterfly elements of each Doppler correlator the same code sequence. Each Doppler correlator is configured with a respective phase rotation that varies across the Doppler correlators. Each Doppler correlator is configured to correlate the samples against the code sequence and apply the respective phase rotation to the samples as the samples are shifted through the successive butterfly elements, to produce respective correlation results from each Doppler correlator centered on a respective frequency offset from the frequency that varies across the Doppler correlators based on the phase rotations.

19. 发明申请

US20200169289A1 EFFICIENT HANDLING OF CLOCK OFFSET IN SPREAD SPECTRUM DECODERS 审中-公开
公开(公告)号：US20200169289A1
公开(公告)日：2020-05-28
申请号：US16779880
申请日：2020-02-03
申请人： Cisco Technology, Inc.
发明人： Knut Inge Hvidsten , Michael A. Ramalho , Ragnvald Balch Barth
IPC分类号： H04B1/7095 , H04L7/00 , H04B1/708
摘要： Doppler correlators are configured to receive samples of a signal sampled based on a frequency. Each Doppler correlator includes successive butterfly elements. Each butterfly element includes cross-coupled first and second branches that include a sample delay that doubles for each successive butterfly element, and a sample inversion selectively placed in one of the first and second branches to encode into the successive butterfly elements of each Doppler correlator the same code sequence. Each Doppler correlator is configured with a respective phase rotation that varies across the Doppler correlators. Each Doppler correlator is configured to correlate the samples against the code sequence and apply the respective phase rotation to the samples as the samples are shifted through the successive butterfly elements, to produce respective correlation results from each Doppler correlator centered on a respective frequency offset from the frequency that varies across the Doppler correlators based on the phase rotations.

20. 发明申请

US20150117497A1 DEVICES AND METHODS EMPLOYING HERMETIC TRANSFORMS FOR ENCODING AND DECODING DIGITAL INFORMATION IN SPREAD-SPECTRUM COMMUNICATION SYSTEMS 有权
标题翻译：在传播通信系统中编码和解码数字信息的设备和方法
公开(公告)号：US20150117497A1
公开(公告)日：2015-04-30
申请号：US14522774
申请日：2014-10-24
申请人： Hobbit Wave
发明人： Harvey C. WOODSUM
IPC分类号： H04B1/7095 , H04B1/7103
CPC分类号： H04B1/7095 , H04B1/707 , H04B1/7093 , H04B1/7103 , H04L27/18 , H04L27/34
摘要： In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag.
摘要翻译：在诸如CDMA的直接序列扩频（DSSS）系统中，使用相移键控或正交幅度调制将信息编码在符号中。此外，发射机将选择的时移滞后应用于每个符号以传送附加信息。接收机检测符号数据和滞后值。接收机可以使用密封匹配滤波器矩阵来识别滞后。

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