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公开(公告)号：US06389088B1
公开(公告)日：2002-05-14
申请号：US09510496
申请日：2000-02-22
IPC分类号： H04L700
CPC分类号： H04L7/0334 , H04L7/0083 , H04L7/0331 , H04L7/046 , H04L7/10
摘要： There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing an in-phase and quadrature component signal and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.
摘要翻译： 公开了一种与由数字无线电发射机发送的数字数据信号一起操作的比特同步搜索和帧同步搜索系统。 通过检测包含在数字信号中的预定的相位信号并具有1和0的重复位模式来实现比特搜索。 首先通过提供同相和正交分量信号来检测定相信号，并将这些信号相关联以提供指示相位信号中的位模式的输出信号。 在提供定相信号并且根据检测到的定相信号补偿与接收装置相关联的振荡器之后，进入跟踪模式，由此捕获帧信号，并且系统产生用于产生误差信号的数据比特转换的直方图 指示所发送的时钟速率和接收的比特的采样部分的差异。 以这种方式，通过根据直方图处理产生的误差信号来调整时钟，可以确保接收机的采样率相对于每个位的中心发生，从而提供对接收到的数字数据的可靠解码或检测 信号存在噪声。
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公开(公告)号：US6052423A
公开(公告)日：2000-04-18
申请号：US349077
申请日：1999-07-08
CPC分类号： H04L7/0334 , H04L7/046 , H04L7/0083 , H04L7/0331 , H04L7/10
摘要： There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing an in-phase and quadrature component signal and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.
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公开(公告)号：US6002728A
公开(公告)日：1999-12-14
申请号：US837353
申请日：1997-04-17
CPC分类号： H04L7/0334 , H04L7/046 , H04L7/0083 , H04L7/0331 , H04L7/10
摘要： There is disclosed a bit sync search and frame sync search system operative with a digital data signal as transmitted by a digital radio transmitter. The bit search is implemented by detecting a predetermined phasing signal which is incorporated in the digital signal and which has a repetitive bit pattern of ones and zeroes. The phasing signal is first detected by providing 94 in-phase and quadrature component signals and correlating those signals to provide an output signal indicative of the bit pattern in the phasing signal. After the phasing signal has been provided and an oscillator associated with a receiving apparatus is compensated according to the detected phasing signal, a tracking mode is entered, whereby a frame signal is captured and the system generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling portion of a received bit. In this manner, by adjusting the clock according to the error signal produced by the histogram process one can be assured that the sampling rate at the receiver will occur relatively at the center of each bit to therefore provide reliable decoding or detection of the received digital data signal in the presence of the noise.
摘要翻译： 公开了一种与由数字无线电发射机发送的数字数据信号一起操作的比特同步搜索和帧同步搜索系统。 通过检测包含在数字信号中的预定的相位信号并具有1和0的重复位模式来实现比特搜索。 首先通过提供94个同相和正交分量信号来检测定相信号，并将这些信号相关联以提供指示相位信号中的位模式的输出信号。 在提供定相信号并且根据检测到的定相信号补偿与接收装置相关联的振荡器之后，进入跟踪模式，由此捕获帧信号，并且系统产生用于产生误差信号的数据比特转换的直方图 指示所发送的时钟速率和接收的比特的采样部分的差异。 以这种方式，通过根据直方图处理产生的误差信号来调整时钟，可以确保接收机的采样率相对于每个位的中心发生，从而提供对接收到的数字数据的可靠解码或检测 信号存在噪声。
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4.发明授权Local and remote echo canceling apparatus particularly adapted for use in a full duplex modem 失效本地和远程回声消除装置，特别适用于全双工调制解调器
公开(公告)号：US5418778A
公开(公告)日：1995-05-23
申请号：US98639
申请日：1993-07-28
IPC分类号： H04B3/23
CPC分类号： H04B3/237
摘要： An echo cancellation apparatus is included in a variable rate modem. The echo cancellation apparatus includes a local echo canceler, a remote echo canceler and a quadrature echo canceler unit. The local and remote echo cancelers both operate to cancel echoes in a similar manner employing topped delay lines or transversal filters wherein the taps of each delay line are adjusted to accommodate both local and remote echo cancellation. The local echo canceler and the remote echo canceler share many programs in common. However, the remote echo canceler operates with a phase lock loop which essentially derives a signal obtained from the quadrature and local echo cancelers which signal is further correlated with the output residuals from the local echo canceler to develop samples applied to the remote echo canceler and to derive a frequency which is indicative of a offset carrier frequency to enable the remote echo canceler to cancel remote echoes. Remote echoes are due to frequency shifts occurring remote from the modem, such as those caused by changes in satellite positions or changes in frequency sources. The remote echo canceler operates to cancel echoes which are greater than 15 milliseconds in delay, as compared to local echoes, which are canceled by the local echo canceler responding to echoes which are delayed 15 milliseconds or less.
摘要翻译： 回波消除装置包括在可变速率调制解调器中。 回波消除装置包括本地回波消除器，远端回波消除器和正交回波消除器单元。 本地和远程回波消除器都以采用顶部延迟线或横向滤波器的类似方式来消除回波，其中每个延迟线的抽头被调节以适应本地和远程回波消除。 本地回波消除器和远程回波消除器共享许多程序。 然而，远程回波消除器通过锁相环工作，其基本上导出从正交和本地回波消除器获得的信号，该信号与来自本地回波消除器的输出残差进一步相关，以开发施加到远端回波消除器的采样， 导出表示偏移载波频率以使远程回波消除器能够取消远程回波的频率。 远程回波是由于远离调制解调器的频移，例如由卫星位置变化或频率变化引起的频移。 与局部回波相比，远程回波消除器操作以消除延迟大于15毫秒的回波，本地回波抵消延迟15毫秒或更短的回波。
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公开(公告)号：US4241447A
公开(公告)日：1980-12-23
申请号：US843689
申请日：1969-07-22
申请人： Marvin A. Epstein
发明人： Marvin A. Epstein
CPC分类号： H04K3/226 , H04K3/25 , H04K2203/36
摘要： A communication system is protected against jamming by modifying a conventional spread spectrum communication system by inserting errors, in the form of digital noise, into the pseudo-noise digital code used to generate the spread spectrum carrier. A bidirectional system is provided so that when jamming occurs, as a consequence of breaking the corrupted spread spectrum code, the pseudo-noise digital code and/or the percent of errors is changed in a prearranged manner to compensate for the jamming and/or reduce the likelihood of breaking the corrupted spread spectrum code. A conventional correlation receiver is employed to recover the intelligence.
摘要翻译： 通过将数字噪声形式的错误插入用于生成扩频载波的伪噪声数字码中，通过修改传统的扩频通信系统来防止通信系统的干扰。 提供了一种双向系统，使得当发生干扰时，由于破坏扩展频谱码的原因，伪噪声数字码和/或误差百分比以预定的方式改变，以补偿干扰和/或减少 破坏扩频码的可能性。 采用传统的相关接收机来恢复智能。
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6.发明授权Radio remote interface for modulating/demodulating data in a digital communication system 有权用于在数字通信系统中调制/解调数据的无线遥控接口
公开(公告)号：US6137828A
公开(公告)日：2000-10-24
申请号：US375064
申请日：1999-08-16
申请人： Marvin A. Epstein , Gary V. Blois , Joseph M. Fine
发明人： Marvin A. Epstein , Gary V. Blois , Joseph M. Fine
CPC分类号： H03C5/00 , H04L2007/047 , H04L7/046
摘要： There is disclosed in a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal and a third type voice signal, a remote communication interface for providing transmission therebetween comprising a duplexer/bridge network for transceiving the signal, means for determining the signal type to be transmitted, low pass filters and analog to digital and digital to analog converters for processing received and transmitted signals, and a digital signal processor for modulating and demodulating the signal for transmission/reception according to the signal type. There is also disclosed means for adjusting the clock sampling frequency during the demodulation process to obtain bit sync, bit tracking and frequency tracking. The communication interface is operable to transceive either the modulated traffic, control, or voice signal, or combined modulated traffic and control signal, or combined modulated voice and control signal.
摘要翻译： 在数字通信系统中公开了通过收发包括第一类型控制信号，第二类型数据业务信号和第三类型语音信号的信号在两个无线电之间通信的数字通信系统，用于在其间提供传输的远程通信接口，包括双工器/桥 用于收发信号的网络，用于确定要发送的信号类型的装置，用于处理接收和发送信号的低通滤波器和模数转换器以及数模转换器，以及用于调制和解调用于发送/接收的信号的数字信号处理器 根据信号类型。 还公开了用于在解调处理期间调整时钟采样频率以获得位同步，位跟踪和频率跟踪的装置。 通信接口可用于收发经调制业务，控制或语音信号，或组合调制业务和控制信号，或组合调制语音和控制信号。
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公开(公告)号：US6018543A
公开(公告)日：2000-01-25
申请号：US861604
申请日：1997-05-21
申请人： Gary V. Blois , Joseph M. Fine , Marvin A. Epstein
发明人： Gary V. Blois , Joseph M. Fine , Marvin A. Epstein
CPC分类号： H04B1/715 , H04B1/1027 , H04B1/713 , H04B2001/7154
摘要： There is disclosed in a frequency hopping digital communication network having a multimode radio transmitter for transmitting a data signal and a multimode radio receiver tuned for receiving the same, the multimode transmitter and receiver operable in a first standard mode and a second enhanced mode, each mode having a late-net acquisition library period and an in-net acquisition library period, a method for obtaining a non-noisy frequency channel over which to receive the data signal transmitted across the radio network. The method comprises the steps of successively averaging signal samples received over a particular frequency channel and time interval corresponding to the receiver mode and library period to determine the noise level of the particular reception frequency channel. The averaged signal samples are then compared to a predetermined noise threshold to determine whether the frequency channel is noisy. If the frequency channel is determined to be noisy, the receiver is tuned to a new reception frequency channel, the new frequency channel being selectable from a group of permissible frequency channels and responsive to the receiver mode and library period and in a predetermined sequence. The steps are repeated until the noise threshold is no longer exceeded.
摘要翻译： 在具有用于发送数据信号的多模无线电发射机和被调谐以用于接收数据信号的多模无线电接收机的跳频数字通信网络中公开了，多模式发射机和接收机可在第一标准模式和第二增强模式下操作，每个模式 具有晚期网络采集库期和网内采集库期间，获得用于接收跨无线网络传输的数据信号的非噪声频道的方法。 该方法包括以下步骤：连续地平均在特定频率信道上接收的信号样本和对应于接收机模式和库周期的时间间隔，以确定特定接收频率信道的噪声电平。 然后将平均的信号样本与预定的噪声阈值进行比较，以确定频道是否有噪声。 如果频道被确定为噪声，则将接收机调谐到新的接收频道，新的频道可以从一组允许的频道中选择并且响应接收机模式和库周期并以预定的顺序。 重复这些步骤，直到不再超过噪声阈值。
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8.发明授权Radio remote interface for modulating/demodulating data in a digital communication system 失效用于在数字通信系统中调制/解调数据的无线遥控接口
公开(公告)号：US5970086A
公开(公告)日：1999-10-19
申请号：US861606
申请日：1997-05-22
申请人： Marvin A. Epstein , Gary V. Blois , Joseph M. Fine
发明人： Marvin A. Epstein , Gary V. Blois , Joseph M. Fine
CPC分类号： H03C5/00 , H04L2007/047 , H04L7/046
摘要： In a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal, and a third type voice signal, a remote communication interface for providing transmission therebetweeen comprising a duplexer bridge network for transceiving the signal, low pass filters, and analog to digital and digital to analog converters for processing received and transmitted signals respectively, and a digital signal processor for modulating and demodulating the signal for transmission or reception according to the signal type. A control signal output from the digital signal processor enables adjustment of the clock sampling frequency during the reception and demodulation process to obtain bit sync, bit tracking and frequency tracking. The communication interface is operable to transceive either the modulated traffic, control, or voice signal, or combined modulated traffic and control signal, or combined modulated voice and control signal.
摘要翻译： 在用于通过收发包括第一类型控制信号，第二类型数据业务信号和第三类型语音信号的信号在两个无线电之间进行通信的数字通信系统中，提供包括用于收发的双工器桥接网络之间的传输的远程通信接口 信号，低通滤波器以及分别用于处理接收和发送信号的模数转换器和数模转换器，以及用于根据信号类型调制和解调用于发送或接收的信号的数字信号处理器。 从数字信号处理器输出的控制信号能够在接收和解调处理期间调整时钟采样频率，以获得位同步，位跟踪和频率跟踪。 通信接口可用于收发经调制业务，控制或语音信号，或组合调制业务和控制信号，或组合调制语音和控制信号。
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9.发明授权
公开(公告)号：US5881096A
公开(公告)日：1999-03-09
申请号：US869583
申请日：1997-06-05
IPC分类号： H04B1/713 , H04B1/7156 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04B1/7156 , H04B1/713
摘要： There is disclosed in a frequency hopping digital communications system having a transmitter for transmitting a data signal via a noisy transmission path, and a receiver responsive to the transmitted signal for receiving the same, a method for removing bias in the data signal at the receiver comprising the steps of: forming a sample amplitude histogram from the received data signal samples for a given hop frequency; correlating the amplitude histogram against a stored reference amplitude histogram to obtain a correlated output signal having a peak correlation position; determining the position difference between the peak correlation position and the correlation center position to provide an offset signal corresponding to the difference and indicative of an estimated bias offset value; and applying the estimated bias offset value to the received signal samples in response to the offset signal to obtain an output signal indicative of an unbiased received data signal.
摘要翻译： 已经公开了一种跳频数字通信系统，其具有经由噪声传输路径传输数据信号的发射机，以及响应于所发送的信号用于接收数据信号的接收机，用于消除接收机处的数据信号中的偏置的方法，包括 步骤：从给定跳频的接收数据信号采样中形成采样振幅直方图; 将幅度直方图与存储的参考幅度直方图相关联，以获得具有峰值相关位置的相关输出信号; 确定所述峰值相关位置和所述相关中心位置之间的位置差，以提供对应于所述差值并指示估计的偏移偏移值的偏移信号; 以及响应于所述偏移信号将所估计的偏置偏移值应用于所接收的信号样本，以获得指示无偏接收数据信号的输出信号。
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10.发明授权
公开(公告)号：US6052406A
公开(公告)日：2000-04-18
申请号：US850231
申请日：1997-05-02
申请人： Marvin A. Epstein , Gary V. Blois , Joseph M. Fine
发明人： Marvin A. Epstein , Gary V. Blois , Joseph M. Fine
CPC分类号： H04J13/00 , H04B1/7156 , H04B2001/71563 , H04B2001/71566 , H04L7/10
摘要： There is disclosed an improved frequency hopping synchronization and tracking system for bit syncing and frame syncing a digital data signal as transmitted by a radio transmitter. A detection means responsive to incoming data samples representative of the phasing signal portion of the digital data signal partitions the data samples into alternating first and second sample sequences and correlates the samples against a frequency hop modulation code reference sequence to provide an initial data signal detection. A post-detection means responsive to the initial detection and to the frequency hop modulation code reference sequence correlates the incoming data samples and compares the spectral power of the correlated data samples to a threshold value to provide bit sync of the detected data signal. Tracking means responsive to the bit sync and to the input samples captures a frame signal and generates histograms of data bit transitions for producing an error signal indicative of the difference of the transmitted clock rate and the sampling position of the received bit. A clock means responsive to the error signal produced by the histogram process can be adjusted according to the error signal to enable sampling of each received data bit to occur relatively at the center of each bit to ensure reliable decoding or detection of a digital data signal in a noisy channel at the receiver.
摘要翻译： 公开了一种用于比特同步和帧同步由无线电发射机发送的数字数据信号的改进的跳频同步和跟踪系统。 响应于代表数字数据信号的相位信号部分的输入数据样本的检测装置将数据样本分割为交替的第一和第二采样序列，并将样本与频率跳跃调制码参考序列相关联以提供初始数据信号检测。 响应于初始检测和频率跳跃调制码参考序列的后检测装置将输入数据采样相关，并将相关数据样本的频谱功率与阈值进行比较，以提供检测到的数据信号的位同步。 响应于位同步和输入样本的跟踪装置捕获帧信号并产生数据位转换的直方图，用于产生指示所发送的时钟速率和接收位的采样位置的差异的误差信号。 响应于由直方图处理产生的误差信号的时钟装置可以根据误差信号进行调整，以使得每个接收的数据位的采样相对发生在每个位的中心，以确保数字数据信号的可靠解码或检测 在接收机的噪声频道。
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