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1. 发明授权

US5548613A DS/CDMA receiver using moving-averaged pilot signals for weighting and phase rotation of orthogonal data symbol vectors 失效
标题翻译： DS / CDMA接收机使用移动平均导频信号进行正交数据符号向量的加权和相位旋转
公开(公告)号：US5548613A
公开(公告)日：1996-08-20
申请号：US365962
申请日：1994-12-29
申请人： Tomoya Kaku , Sean O'Regan
发明人： Tomoya Kaku , Sean O'Regan
IPC分类号： H04B1/707 , H04B1/7095 , H04B1/712 , H04B1/76 , H04B7/26 , H04L7/00 , H04W88/02
CPC分类号： H04B1/707
摘要： In a direct sequence spread spectrum receiver, spread orthogonal data signals and spread orthogonal pilot signals are correlated with orthogonal despreading sequences at a chip rate. These despread signals are integrated at a symbol rate to produce orthogonal data symbols and orthogonal pilot symbols. A predetermined number of pilot symbols of each phase component are moving-averaged. Each phase component of the orthogonal data symbols is weighted with the moving average value of the corresponding phase component of the pilot symbols, and summed with the other weighted component of the data symbols to produce an output signal of the spread spectrum receiver.
摘要翻译：在直接序列扩频接收机中，扩频正交数据信号和扩频正交导频信号以码片速率与正交解扩序列相关。这些解扩信号以符号速率被积分以产生正交数据符号和正交导频符号。每个相位分量的预定数量的导频符号被移动平均。正交数据符号的每个相位分量用导频符号的相应相位分量的移动平均值加权，并与数据符号的其他加权分量相加，以产生扩频接收机的输出信号。

2. 发明授权

US5365550A Initial synchronization and tracking circuits for spread spectrum receivers 失效
标题翻译：用于扩频接收机的初始同步和跟踪电路
公开(公告)号：US5365550A
公开(公告)日：1994-11-15
申请号：US732461
申请日：1991-07-18
申请人： David L. Roberson
发明人： David L. Roberson
IPC分类号： H04B1/7075 , H04B1/7085 , H04B1/7095 , H04L27/30
CPC分类号： H04B1/7075 , H04B1/7085 , H04B1/7095
摘要： A direct sequence digital spread spectrum receiver acquires and maintains synchronization in a reliable, yet simple manner, even under severe multipath and interference conditions. A sliding correlator and a voltage controlled crystal oscillator (VCXO) cooperate to acquire initial synchronization, and once synchronization is acquired, the VCXO is linearly frequency modulated (FM) for accurate tracking. The difficult problem of keeping the receiver code clock synchronized to that of the transmitter under severe multipath and interference conditions is solved by virtue of a dual switched bandwidth low pass filter section of the tracking circuit, allowing a wide bandwidth for initial acquisition and tracking but once the clocks are aligned, a narrow loop takes over that follows the transmitter closely. A commercially available intermediate frequency (IF) integrated circuit (IC) is used as an amplitude modulated (AM) detector to achieve the large dynamic range required. The IF IC has an internal received signal strength indicator (RSSI) output which is used to demodulate the amplitude variations generated by the tracking circuit.
摘要翻译：直接序列数字扩频接收机即使在严重的多路径和干扰条件下也可以以可靠而简单的方式获取和维持同步。滑动相关器和压控晶体振荡器（VCXO）协调获取初始同步，一旦获取同步，VCXO就被线性调频（FM）进行精确跟踪。通过跟踪电路的双开关带宽低通滤波器部分解决了在严重的多路径和干扰条件下将接收器代码保持与发送器的时钟同步的困难问题，允许宽带宽用于初始采集和跟踪，但一次时钟是对齐的，一个狭窄的环路接管发射机后紧跟着。使用市售中频（IF）集成电路（IC）作为幅度调制（AM）检测器以实现所需的大动态范围。 IF IC具有用于解调由跟踪电路产生的振幅变化的内部接收信号强度指示符（RSSI）输出。

3. 发明申请

US20170111083A1 DEVICES AND METHODS EMPLOYING HERMETIC TRANSFORMS FOR ENCODING AND DECODING DIGITAL INFORMATION IN SPREAD-SPECTRUM COMMUNICATION SYSTEMS 审中-公开
公开(公告)号：US20170111083A1
公开(公告)日：2017-04-20
申请号：US15389927
申请日：2016-12-23
申请人： Hobbit Wave, Inc.
发明人： Harvey C. WOODSUM
IPC分类号： H04B1/7095 , H04L27/18 , H04L27/34
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.

4. 发明授权

US09531431B2 Devices and methods employing hermetic transforms for encoding and decoding digital information in spread-spectrum communications systems 有权
标题翻译：使用密封变换的设备和方法，用于在扩频通信系统中对数字信息进行编码和解码
公开(公告)号：US09531431B2
公开(公告)日：2016-12-27
申请号：US14522774
申请日：2014-10-24
申请人： Hobbit Wave, Inc.
发明人： Harvey C. Woodsum
IPC分类号： H04B1/707 , H04B1/7093 , 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。

5. 发明授权

US06937667B1 Apparatus, system and method for flip modulation in an impulse radio communications system 失效
标题翻译：用于脉冲无线电通信系统中的翻转调制的装置，系统和方法
公开(公告)号：US06937667B1
公开(公告)日：2005-08-30
申请号：US09537692
申请日：2000-03-29
申请人： Larry W. Fullerton , James L. Richards , Ivan A. Cowie , David M. Dickson , Vernon R. Brethour , Preston Jett
发明人： Larry W. Fullerton , James L. Richards , Ivan A. Cowie , David M. Dickson , Vernon R. Brethour , Preston Jett
IPC分类号： H04B1/7095 , H04B1/7163 , H04B1/717 , H04B1/7176 , H04B1/7183 , H04L25/49 , H04B1/02 , H04B1/04
CPC分类号： H04B1/7095 , H04B1/71632 , H04B1/7174 , H04B1/7176 , H04B1/7183
摘要： Apparatuses, systems and methods for transmitting and receiving modulated impulse radio signals. An impulse radio receiver includes a time base, a precision timing generator, a template generator, a delay, first and second correlators, a data detector and a time base adjustor. The time base produces a periodic timing signal that is used by the precision timing generator to produce a timing trigger signal. The template generator uses the timing trigger signal to produce a template signal. A delay receives the template signal and outputs a delayed template signal. When an impulse radio signal is received, the first correlator correlates the received impulse radio signal with the template signal to produce a first correlator output signal, and the second correlator correlates the received impulse radio signal with the delayed template signal to produce a second correlator output signal. The data detector produces a data signal based on at least the first correlator output signal. The time base adjustor produces a time base adjustment signal based on at least the second correlator output signal. The time base adjustment signal is used to synchronize the time base with the received impulse radio signal.
摘要翻译：用于发送和接收调制脉冲无线电信号的装置，系统和方法。脉冲无线电接收机包括时基，精度定时发生器，模板发生器，延迟，第一和第二相关器，数据检测器和时基调节器。时基产生周期性定时信号，由精确定时发生器用来产生定时触发信号。模板发生器使用定时触发信号产生模板信号。延迟接收模板信号并输出延迟的模板信号。当接收到脉冲无线电信号时，第一相关器将接收到的脉冲无线电信号与模板信号相关，以产生第一相关器输出信号，并且第二相关器将接收的脉冲无线电信号与延迟的模板信号相关联，以产生第二相关器输出信号。数据检测器至少基于第一相关器输出信号产生数据信号。时基调节器至少基于第二相关器输出信号产生时基调整信号。时基调整信号用于使时基与接收的脉冲无线电信号同步。

6. 发明授权

US06842479B2 Method and apparatus for interference cancellation in a rake receiver 有权
标题翻译：用于在耙式接收机中进行干扰消除的方法和装置
公开(公告)号：US06842479B2
公开(公告)日：2005-01-11
申请号：US09992094
申请日：2001-11-05
申请人： Gregory E. Bottomley
发明人： Gregory E. Bottomley
IPC分类号： H04B1/10 , H04B1/707 , H04B1/7095 , H04B1/7113 , H04B1/712 , H04B7/005 , H04B7/02 , H04L25/02 , H04L25/03 , H04L27/30
CPC分类号： H04B1/712 , H04B1/7095 , H04B1/7113 , H04B2201/70701 , H04L25/0204 , H04L25/0328 , H04L25/03299 , H04L25/03337
摘要： Systems and methods for despreading received spread spectrum signals are described. Despreading can be performed using both channel estimates and impairment correlation estimates. Techniques for selecting delays of interest are also described, along with a despreading mechanism which saves power by operating only on delays of interest.
摘要翻译：描述了用于解扩接收扩频信号的系统和方法。可以使用信道估计和损伤相关估计来执行解扩。还描述了用于选择感兴趣的延迟的技术，以及解扩机制，其通过仅在感兴趣的延迟上操作来节省功率。

7. 发明授权

US10601459B1 Efficient handling of clock offset in spread spectrum decoders 有权
公开(公告)号：US10601459B1
公开(公告)日：2020-03-24
申请号：US16179234
申请日：2018-11-02
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.

8. 发明授权

US10541720B2 Extended range communications for ultra-wideband network nodes 有权
公开(公告)号：US10541720B2
公开(公告)日：2020-01-21
申请号：US16289034
申请日：2019-02-28
申请人： SIERRA NEVADA CORPORATION
发明人： Donald Rasmussen
IPC分类号： H04B1/713 , H04B1/711 , H04L1/00 , H04B1/10 , H04B1/71 , H04B1/7073 , H04B10/61 , H04B1/7095 , H04B1/7163
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.

9. 发明授权

US10291273B2 Distortion cancellation device and method 有权
公开(公告)号：US10291273B2
公开(公告)日：2019-05-14
申请号：US15899405
申请日：2018-02-20
申请人： FUJITSU LIMITED
发明人： Mitsuharu Hamano
IPC分类号： H04B1/00 , H04B1/10 , H04B1/7073 , H04B1/7095 , H04B1/7093 , H04B1/7075
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.

10. 发明授权

US5894494A Parallel correlator architecture for synchronizing direct sequence spread-spectrum signals 失效
标题翻译：用于同步直接序列扩频信号的并行相关器架构
公开(公告)号：US5894494A
公开(公告)日：1999-04-13
申请号：US958785
申请日：1997-10-29
申请人： Sorin Davidovici
发明人： Sorin Davidovici
IPC分类号： H04L27/22 , H04B1/707 , H04B1/7095 , H04L7/00 , H04L7/08
CPC分类号： H04B1/7095 , H04B1/707
摘要： A spread-spectrum-correlator apparatus including a symbol-shift register, an in-phase-symbol correlator, a quadrature-phase-symbol correlator, a frame-shift register, an in-phase-frame correlator, a quadrature-phase-frame correlator, and a control processor. The symbol-shift register circulates replicas of a header-chip-sequence signal or data-chip-sequence signal, which are used for in-phase-symbol correlating and the quadrature-phase-symbol correlating. The in-phase-frame correlator and the quadrature-phase-frame correlator detect a despread-header-symbol-sequence signal and generate a maximum output signal which may be used as a data-start signal or for synchronizing the timing of the control processor as to when to trigger sampling of the analog-to-digital converter, to set which chip-sequence signal is circulated in the symbol-shift register, to control the output of the symbol correlator, to detect the data-symbol-sequence signal and other time-dependent processes.
摘要翻译：一种扩展频谱相关器装置，包括符号移位寄存器，同相符号相关器，正交相位符号相关器，帧移位寄存器，同相帧相关器，正交相位帧相关器和控制处理器。符号移位寄存器循环用于同相符号相关和正交相位符号相关的标题片段序列信号或数据片段序列信号的副本。同相帧相关器和正交相位相关器检测去扩展标题符号序列信号并产生最大输出信号，该最大输出信号可用作数据启动信号或用于使控制处理器的定时同步关于什么时候触发模数转换器的采样，设定哪个芯片序列信号在符号移位寄存器中循环，以控制符号相关器的输出，以检测数据符号序列信号和其他时间依赖过程。

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