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91. 发明授权

US06868114B2 Interference suppression in a spread spectrum communications system using non-linear frequency domain excision 失效
标题翻译：使用非线性频域切除的扩频通信系统中的干扰抑制
公开(公告)号：US06868114B2
公开(公告)日：2005-03-15
申请号：US09919121
申请日：2001-07-30
申请人： Theodore Bially , Paul F. McKenzie
发明人： Theodore Bially , Paul F. McKenzie
IPC分类号： G06F17/14 , H04B1/71 , H04K1/00 , H04B1/69
CPC分类号： H04B1/7102 , H04B2201/70727
摘要： In a frequency-domain excision system for a wide band receiver, a window function is applied to blocks of received signal samples and a transform function is applied to the windowed blocks. Each block of frequency-domain coefficients from the transform function is morphologically filtered to generate a threshold function representing an estimate of the spectrum of the desired wide band signal, and a non-linear gain function is applied to the coefficients. The gain function has a fixed-gain region for input values less than a threshold value from the threshold function, an excision region for input values greater than a multiple of the threshold value, and a soft limiting region between the fixed-gain region and the excision region. The inverse transform is performed on the excised blocks of coefficients, and an overlap-eliminating central portion of the inverse of the window function is applied to the resulting blocks of signal samples.
摘要翻译：在用于宽带接收机的频域切除系统中，将窗函数应用于接收信号样本的块，并将变换函数应用于窗口块。来自变换函数的每个频域系数块被形态滤波以产生表示所需宽带信号的频谱的估计的阈值函数，并且将非线性增益函数应用于系数。增益函数具有用于小于阈值函数的阈值的输入值的固定增益区域，用于大于阈值的倍数的输入值的切除区域，以及固定增益区域与固定增益区域之间的软限制区域切除区。对所切除的系数块执行逆变换，并且将窗函数的逆的重叠消除中心部分应用于所得到的信号样本块。

92. 发明申请

US20030112905A1 Global positioning system receiver capable of functioning in the presence of interference 有权
公开(公告)号：US20030112905A1
公开(公告)日：2003-06-19
申请号：US10294227
申请日：2002-11-14
发明人： Johann Heinzl , Gary Jacobsen , Jining Yang , Kishan Shenoi
IPC分类号： H04B001/10
CPC分类号： G01S19/37 , G01S19/21 , H03J1/0008 , H03J3/08 , H04B1/7102
摘要： Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies: computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus, comprising: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.

93. 发明申请

US20020186803A1 Compensation of reference frequency drift in system requiring critical upstream timing 有权
标题翻译：在需要关键上行时序的系统中参考频率漂移的补偿
公开(公告)号：US20020186803A1
公开(公告)日：2002-12-12
申请号：US10136060
申请日：2002-04-30
发明人： Thomas J. Kolze
IPC分类号： H04L007/00
CPC分类号： H04N21/6168 , H04B1/71 , H04B1/7102 , H04B1/7103 , H04B1/71055 , H04B1/71072 , H04B2201/709709 , H04L1/0003 , H04L1/0009 , H04L1/0045 , H04L1/005 , H04L1/0057 , H04N7/17309
摘要： Systems and methods are disclosed for to compensating reference frequency drift in a communications system having a plurality of modems and a headend, where the system requires critical upstream timing. One embodiment of the method includes learning or determining the relative delay of each modem and reporting each modem's unique delay (relative to the closest modem) to the headend. The method further includes the headend monitoring its own reference for frequency drift, the modem broadcasting pertinent frequency drift information to the modems and adjusting the modems' upstream timing to account for each modem's unique distance (i.e., delay) combined with the broadcast stream of frequency drift information.
摘要翻译：公开了用于在具有多个调制解调器和头端的通信系统中补偿参考频率漂移的系统和方法，其中系统需要关键的上行时序。该方法的一个实施例包括学习或确定每个调制解调器的相对延迟并将每个调制解调器的唯一延迟（相对于最接近的调制解调器）报告给头端。该方法还包括头端监测其自身的频率漂移参考，调制解调器向调制解调器广播相关频率漂移信息，并调整调制解调器的上行定时以考虑与频率广播流组合的每个调制解调器的唯一距离（即，延迟）漂移信息。

94. 发明申请

US20020186756A1 Channel equalization with SCDMA modulation 失效
标题翻译：信道均衡与SCDMA调制
公开(公告)号：US20020186756A1
公开(公告)日：2002-12-12
申请号：US10136061
申请日：2002-04-30
发明人： Thomas J. Kolze , Bruce J. Currivan
IPC分类号： H04K001/00
CPC分类号： H04B1/7105 , H04B1/71 , H04B1/7102 , H04B1/7103 , H04B1/71055 , H04B1/71072 , H04B2201/709709 , H04L1/0003 , H04L1/0009 , H04L1/0045 , H04L1/005 , H04L1/0057 , H04N21/6168
摘要： The present invention relates a system and method for mitigating impairment in a communication system. In one embodiment, the system comprises a transmitter adapted to transmit at least one signal and a receiver adapted to receive the at least one signal and mitigate inter code interference in the signal using at least one inter code interference coefficient.
摘要翻译：本发明涉及一种用于减轻通信系统中的损害的系统和方法。在一个实施例中，系统包括适于发送至少一个信号的发射机和适于接收至少一个信号的接收机，并且使用至少一个码间干扰系数来减轻信号中的码间干扰。

95. 发明授权

US06426983B1 Method and apparatus of using a bank of filters for excision of narrow band interference signal from CDMA signal 有权
标题翻译：使用一组滤波器从CDMA信号中切除窄带干扰信号的方法和装置
公开(公告)号：US06426983B1
公开(公告)日：2002-07-30
申请号：US09152645
申请日：1998-09-14
申请人： Selim Shlomo Rakib , Yoram Zarai
发明人： Selim Shlomo Rakib , Yoram Zarai
IPC分类号： H03D104
CPC分类号： H04B1/7102 , H04B1/709
摘要： A narrow band interference excision circuit for use in broadband digital data communication systems such as CDMA systems. The excision circuit is comprised of a matrix of polyphase filters that divide the input signal into a plurality of narrow subbands. Each narrow subband signal is examined to determine if narrowband interference exists in that bin. This is done preferably by computing the average power of the subband signal. If a signal in a bin has an average power greater than some adjustable or adaptive threshold, then the entire subband signal is eliminated. A bank of polyphase synthesis filters reassembles the composite signal. An equalization circuit with an error predictor comprised of an adaptive FIR filter is coupled to adapt coefficients of the filter and generate a colored noise cancellation signal to remove colored noise from the input to the slicer.
摘要翻译：用于宽带数字数据通信系统如CDMA系统的窄带干扰切除电路。切除电路由多相滤波器的矩阵组成，其将输入信号分成多个窄子带。检查每个窄子带信号以确定在该仓中是否存在窄带干扰。这通过计算子带信号的平均功率来进行。如果一个信道在一个平均功率大于一些可调或自适应阈值，那么整个子带信号被消除。多相合成滤波器组重新组合复合信号。耦合具有由自适应FIR滤波器组成的误差预测器的均衡电路以适应滤波器的系数，并产生彩色噪声消除信号，以从输入到切片器的彩色噪声中去除有色噪声。

96. 发明授权

US06396824B1 CDMA communications and geolocation system and method 失效
标题翻译： CDMA通信和地理定位系统及方法
公开(公告)号：US06396824B1
公开(公告)日：2002-05-28
申请号：US09395626
申请日：1999-09-14
申请人： Donald L. Schilling
发明人： Donald L. Schilling
IPC分类号： H04B7216
CPC分类号： H04W52/343 , G01S5/0036 , G01S5/14 , G01S13/82 , H04B1/707 , H04B1/71 , H04B1/7102 , H04B7/18547 , H04B7/216 , H04B7/2628 , H04B7/2631 , H04B2201/70701 , H04B2201/709709 , H04J13/00 , H04W4/12 , H04W4/18 , H04W52/346 , H04W64/00 , H04W64/006 , H04W88/02 , H04W88/08
摘要： A spread-spectrum CDMA communications system for locating remote units, and for communicating message data between a plurality of remote units and a base station. The spread-spectrum CDMA communications system includes a plurality of base stations and a plurality of remote units. A base station has a spread-spectrum modulator for spread-spectrum processing the message data, and a transmitter for transmitting the spread-spectrum processed-message data, combined with a generic-chip-code signal, from the base station to a remote unit. The base station also has an antenna, and spread-spectrum detectors for recovering message-data communicated from the remote units. A remote unit has an antenna, and a detector coupled to the antenna for recovering data communicated from the base station. The detector includes a spread spectrum demodulator. Also, the remote unit has a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter. The base station has a range circuit, which comparers the generic-chip-code signal generated at the base station with the generic-chip-code signal received from the remote unit, for determining a range between the remote unit and the base station.
摘要翻译：一种用于定位远程单元并用于在多个远程单元和基站之间传送消息数据的扩频CDMA通信系统。扩频CDMA通信系统包括多个基站和多个远程单元。基站具有用于对消息数据进行扩频处理的扩频调制器，以及用于从基站向远程单元发送与通用芯片码信号组合的扩频处理消息数据的发射机。基站还具有天线和用于恢复从远程单元传送的消息数据的扩频检测器。远程单元具有天线和耦合到天线的检测器，用于恢复从基站传送的数据。检测器包括扩频解调器。而且，远程单元还具有用于将数据格式转换为适合通过无线电波，扩频调制器和发射机进行通信的形式的装置。基站具有范围电路，其将在基站处生成的通用芯片码信号与从远程单元接收的通用芯片码信号进行比较，以确定远程单元和基站之间的范围。

97. 发明授权

US6075808A Spread spectrum time diversity communications system 失效
标题翻译：扩频时间分集通信系统
公开(公告)号：US6075808A
公开(公告)日：2000-06-13
申请号：US018893
申请日：1998-02-05
申请人： Ichiro Tsujimoto
发明人： Ichiro Tsujimoto
IPC分类号： H04B7/02 , H04B1/707 , H04B1/71 , H04B1/7115 , H04B1/712 , H04J13/00
CPC分类号： H04B1/7115 , H04B1/707 , H04B1/712 , H04J13/00 , H04B1/7102
摘要： In a time diversity radio communications system, quadrature-modulated spread spectrum signals of different mutual time delay are combined into a code division multiplex signal and up-converted to a radio-frequency signal and transmitted. At a receive site, the signal is received by an antenna and down-converted to recover the code division multiplex signal. Quadrature-modulated component signals contained in the recovered code division multiplex signal are converted to baseband signals which are then time-aligned with each other. The time-aligned baseband signals are multiplied respectively by complex weighting factors and are combined together to produce an input signal for an adaptive equalizer. This input signal is also applied to an AGC amplifier where it is amplified and applied to correlation detectors where correlations between the amplified signal and the baseband signals are detected and the complex weighting factors are derived respectively from the correlations. In a modified embodiment, the quadrature-modulated component signals are fed into an adaptive RAKE matched filter where the output of the AGC amplifier is used for detecting the correlations.
摘要翻译：在时分多址无线电通信系统中，将不同相互时延的正交调制扩频信号组合成码分多路复用信号，并上变频到射频信号并发送。在接收站点，信号由天线接收并被下变频以恢复码分多路复用信号。包含在恢复的码分多路复用信号中的正交调制分量信号被转换为基带信号，然后基带信号彼此进行时间对准。时间对齐的基带信号分别乘以复加权因子并被组合在一起以产生用于自适应均衡器的输入信号。该输入信号也被施加到AGC放大器，其被放大并被施加到检测放大信号和基带信号之间的相关性的相关检测器，并且分别从相关性导出复加权因子。在修改实施例中，正交调制分量信号被馈送到自适应RAKE匹配滤波器，其中AGC放大器的输出用于检测相关性。

98. 发明授权

US5974039A CDMA communications and geolocation system and method 失效
公开(公告)号：US5974039A
公开(公告)日：1999-10-26
申请号：US871479
申请日：1997-06-09
申请人： Donald L. Schilling
发明人： Donald L. Schilling
IPC分类号： G01S5/00 , G01S5/14 , G01S13/82 , G01S19/11 , H04B1/707 , H04B1/71 , H04B7/005 , H04B7/185 , H04B7/216 , H04B7/26 , H04J13/00 , H04W4/12 , H04W4/18 , H04W52/34 , H04W64/00 , H04W88/02 , H04W88/08 , H04J13/02
CPC分类号： H04W52/343 , G01S13/82 , G01S5/0036 , G01S5/14 , H04B1/707 , H04B1/71 , H04B1/7102 , H04B7/216 , H04B7/2631 , H04J13/00 , H04W52/346 , H04B2201/70701 , H04B2201/709709 , H04B7/18547 , H04B7/2628 , H04W4/12 , H04W4/18 , H04W64/00 , H04W64/006 , H04W88/02 , H04W88/08
摘要： A spread-spectrum CDMA communications system for locating remote units, and for communicating message data between a plurality of remote units and a base station. The spread-spectrum CDMA communications system includes a plurality of base stations and a plurality of remote units. A base station has a spread-spectrum modulator for spread-spectrum processing the message data, and a transmitter for transmitting the spread-spectrum processed-message data, combined with a generic-chip-code signal, from the base station to a remote unit. The base station also has an antenna, and spread-spectrum detectors for recovering message-data communicated from the remote units. A remote unit has an antenna, and a detector coupled to the antenna for recovering data communicated from the base station. The detector includes a spread spectrum demodulator. Also, the remote unit has a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter. The base station has a range circuit, which comparers the generic-chip-code signal generated at the base station with the generic-chip-code signal received from the remote unit, for determining a range between the remote unit and the base station.

99. 发明授权

US5870425A Differential receiver of direct sequence spread spectrum signals 失效
标题翻译：直接序列扩频信号的差分接收机
公开(公告)号：US5870425A
公开(公告)日：1999-02-09
申请号：US747260
申请日：1996-11-12
申请人： Bernard Piaget , Charles Fort , Patrick Le Masson
发明人： Bernard Piaget , Charles Fort , Patrick Le Masson
IPC分类号： H04B1/707 , H04J13/00 , H04K3/00 , H04B15/00
CPC分类号： H04B1/7102 , H04B1/707 , H04K3/228 , H04K3/25 , H04K3/827
摘要： A Differential receiver of direct sequence spread spectrum signals, wherein, the intermediate frequency stage comprises N filtering and amplifying channels in N separate bands. The amplification of a channel is adjusted so that the power levels delivered by the channels correspond to a predetermined power distribution law.
摘要翻译：一种直接序列扩频信号的差分接收机，其中，中频级包括在N个独立频带中的N个滤波和放大信道。调整通道的放大，使得由通道传送的功率电平对应于预定功率分布定律。

100. 发明授权

US5757853A Spread spectrum time diversity communications system 失效
公开(公告)号：US5757853A
公开(公告)日：1998-05-26
申请号：US620246
申请日：1996-03-22
申请人： Ichiro Tsujimoto
发明人： Ichiro Tsujimoto
IPC分类号： H04B7/02 , H04B1/707 , H04B1/71 , H04B1/7115 , H04B1/712 , H04J13/00
CPC分类号： H04B1/7115 , H04B1/707 , H04B1/712 , H04J13/00 , H04B1/7102
摘要： In a time diversity radio communications system, quadrature-modulated spread spectrum signals of different mutual time delay are combined into a code division multiplex signal and up-converted to a radio-frequency signal and transmitted. At a receive site, the signal is received by an antenna and down-converted to recover the code division multiplex signal. Quadrature-modulated component signals contained in the recovered code division multiplex signal are converted to baseband signals which are then time-aligned with each other. The time-aligned baseband signals are multiplied respectively by complex weighting factors and are combined together to produce an input signal for an adaptive equalizer. This input signal is also applied to an AGC amplifier where it is amplified and applied to correlation detectors where correlations between the amplified signal and the baseband signals are detected and the complex weighting factors are derived respectively from the correlations. In a modified embodiment, the quadrature-modulated component signals are fed into an adaptive RAKE matched filter where the output of the AGC amplifier is used for detecting the correlations.

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