公开(公告)号：US09667349B1

公开(公告)日：2017-05-30

申请号：US14871617

申请日：2015-09-30

申请人： David Mellick

发明人： David Mellick

IPC分类号： H04B10/64 ,  H04B10/61 ,  H04B10/079

CPC分类号： H04B10/6164 ,  H04B1/123 ,  H04B10/0795 ,  H04B10/615 ,  H04B10/64 ,  H04L27/22 ,  H04L27/223 ,  H04L27/2275 ,  H04L27/2277 ,  H04L27/2338 ,  H04L27/2657 ,  H04L27/3863 ,  H04L47/6245 ,  H04L2027/0059 ,  H04L2027/0061 ,  H04L2027/0067

摘要： A method of dynamic range extension for heterodyne fiber-optic Interferometers, and more particularly towards the use of instantaneous carrier to extend the dynamic range of heterodyne fiber-optic interferometers. The method includes the providing of a heterodyne fiber-optic interferometer having a demodulator and an associated carrier frequency. The method also includes the determining of demodulator excessions. The detecting of the demodulator excessions and the determining of an appropriate correction factor is based on information from the instantaneous carrier frequency. The method also includes the introduction of the appropriate correction factor to the demodulator.

公开(公告)号：US3978406A

公开(公告)日：1976-08-31

申请号：US603901

申请日：1975-08-11

申请人： Youichi Matsumoto ,  Seijiro Yokoyama ,  Tadao Shimamura

发明人： Youichi Matsumoto ,  Seijiro Yokoyama ,  Tadao Shimamura

IPC分类号： H04L27/00 ,  H04L1/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/227 ,  H04L1/10

CPC分类号： H04L1/0061 ,  H04L27/2046 ,  H04L27/2277

摘要： A code error detection system in a digital phase modulation communication system comprises on the transmitter side a first code train generator for generating a pseudo-random code train and a second code train generator for generating codes which are complementary to each other at n-bit intervals. A 4-phase phase modulator is driven by another code representative of the exclusive OR function of the pseudo-random and complementary codes.

公开(公告)号：US08139681B2

公开(公告)日：2012-03-20

申请号：US11662574

申请日：2005-09-09

申请人： James Chapman ,  Simon Richardson ,  Cyril Valadon ,  Navid Fatemi-Ghomi

发明人： James Chapman ,  Simon Richardson ,  Cyril Valadon ,  Navid Fatemi-Ghomi

IPC分类号： H03K9/00

CPC分类号： H04L27/2277 ,  H04L25/0224 ,  H04L2027/0032 ,  H04L2027/0055 ,  H04L2027/0061 ,  H04L2027/0067 ,  H04L2027/0095

摘要： A communications signal is received through a propagation channel, down-converted in frequency and then converted into a digital signal. The samples of the digital signal are processed to estimate the information conveyed by the communications signal. The estimated information is then used with knowledge about the propagation channel to model the samples of the digital signal. The modeled samples are compared with actual samples of the digital signal to deduce phase errors in the digital signal. The phase errors are then used to deduce a frequency error in the digital signal that can be used to correct the samples of the digital signal and to correct the down-conversion process.

摘要翻译： 通过传播信道接收通信信号，频率下变频，然后转换为数字信号。 对数字信号的采样进行处理，以估计通信信号传送的信息。 然后将估计的信息用于关于传播信道的知识以对数字信号的采样进行建模。 将建模样本与数字信号的实际采样进行比较，以推断数字信号中的相位误差。 然后使用相位误差来推导数字信号中的频率误差，该频率误差可用于校正数字信号的采样并纠正下变频过程。

公开(公告)号：US5423085A

公开(公告)日：1995-06-06

申请号：US125853

申请日：1993-09-24

申请人： Mu-gil Lim

发明人： Mu-gil Lim

IPC分类号： H03J7/06 ,  H04B1/16 ,  H04B7/212 ,  H04L27/22 ,  H04L27/227 ,  H04L27/38 ,  H04B1/10

CPC分类号： H04L27/2277

摘要： An automatic frequency control method re-modulates a binary data sequence output from an equalizer using the convolution of an estimated channel characteristic value function and a transfer function of the modulator in the transmitter of a communication system, to obtain a reference phase. The reference phase then is compared with a receiving phase to produce a phase error value. The phase error value is converted into a frequency error value, which is then converted into an analog control voltage and applied to a voltage controlled oscillator. Apparatus for performing the method includes an equalizer, a channel characteristic estimator, a re-modulator, a phase comparator, a frequency error estimator and a digital-to-analog converter, to thus improve the receiving performance of a receiver by digital implementation.

摘要翻译： 自动频率控制方法使用通信系统的发射机中估计的信道特征值函数和调制器的传递函数的卷积重新调制从均衡器输出的二进制数据序列，以获得参考相位。 然后将参考相位与接收相位进行比较以产生相位误差值。 将相位误差值转换为频率误差值，然后将其转换为模拟控制电压并施加到压控振荡器。 用于执行该方法的装置包括均衡器，信道特性估计器，再调制器，相位比较器，频率误差估计器和数模转换器，从而通过数字实现来提高接收机的接收性能。

公开(公告)号：US4313205A

公开(公告)日：1982-01-26

申请号：US166288

申请日：1980-07-07

申请人： Smith A. Rhodes

发明人： Smith A. Rhodes

IPC分类号： H04L7/027 ,  H04L27/227 ,  H04L27/22 ,  H03D3/02

CPC分类号： H04L27/2277 ,  H04L7/027

摘要： In a TDMA burst preamble, the phase is varied between .+-..pi./4 radians, and carrier synchronization is achieved by averaging the phase over a given interval. Symbol timing synchronization is achieved by filtering the upper sideband of a conventional delay-and-multiply circuit and demodulating the filtered upper sideband with a coherent carrier available by the end of the preamble. After the preamble, modulation removal is used to obtain the unmodulated carrier.

摘要翻译： 在TDMA突发前导码中，相位在+/-π/ 4弧度之间变化，并且通过在给定间隔上平均相位来实现载波同步。 通过对传统的延迟和乘法电路的上边带进行滤波来实现符号定时同步，并且通过前导码结尾可用的相干载波对经过滤波的上边带进行解调。 在前导码之后，使用调制去除来获得未调制的载波。

公开(公告)号：US4213094A

公开(公告)日：1980-07-15

申请号：US924115

申请日：1978-07-13

申请人： Wilhelm A. H. Wood

发明人： Wilhelm A. H. Wood

IPC分类号： H04L27/20 ,  H04L27/227

CPC分类号： H04L27/2277 ,  H04L27/2057

摘要： A modulation system for use in generating a multiphase carrier for digital communication systems which avoids phase and amplitude errors due to temperature and voltage variations inherent in balanced mixers, when used as phase modulators. In this invention, resistive divider networks are used to generate the output vector array. Each output vector thus, has an independent resistive adjustment which has no effect on the other vectors to provide individual and separately aligned phase vectors which are selected for transmission by an addressable multiplexer to provide a phase modulated carrier representing multiplex input data.

摘要翻译： 用于生成用于数字通信系统的多相载波的调制系统，当用作相位调制器时，避免了由平衡混频器中固有的温度和电压变化引起的相位和幅度误差。 在本发明中，电阻分压器网络用于产生输出矢量阵列。 因此，每个输出矢量具有独立的电阻调节，其对其他矢量没有影响，以提供单独和单独排列的相位矢量，其被选择用于由可寻址多路复用器传输以提供表示复用输入数据的相位调制载波。

公开(公告)号：US3984777A

公开(公告)日：1976-10-05

申请号：US616512

申请日：1975-09-25

申请人： Toshitake Noguchi

发明人： Toshitake Noguchi

IPC分类号： H04L27/227 ,  H04B1/16

CPC分类号： H04L27/2277

摘要： A carrier wave reproducer device for use in the reception of a multi-phase digital phase-modulated waves for rapidly extracting the carrier wave without the generation of frequencies higher than the carrier frequency is disclosed. In its simplest embodiment, the device employs a delay detector and a cumulative adder circuit to derive a demodulated signal and a modulator for inversely modulating the input multi-phase digital phase-modulated wave with said demodulated signal. The reference carrier wave is then obtained from the output of the modulator. The same principle is used in alternative embodiments used in the reception of a burst form of signal transmitted with a preamble word having a specific pattern. These alternative embodiments take advantage of the preamble word generally included in a burst form of signal by additionally employing a demodulator for demodulating the input multi-phase digital phase-modulated wave through synchronized detection by making use of the reference carrier wave obtained from the modulator. In addition, a switching circuit is employed to supply the modulator with the demodulated output from the adder circuit at the beginning of reception of the phase-modulated wave, but after the reference carrier wave has been established, to supply the modulator with the output of the demodulator.

摘要翻译： 公开了一种用于接收用于快速提取载波而不产生高于载波频率的频率的多相数字相位调制波的载波再现装置。 在其最简单的实施例中，该装置采用延迟检测器和累积加法器电路来导出解调信号，以及用所述解调信号对输入的多相数字相位调制波进行逆调制的调制器。 然后从调制器的输出获得参考载波。 在用具有特定模式的前导字发送的信号的突发形式的接收中使用的替代实施例中使用相同的原理。 这些替代实施例通过另外使用解调器来通过使用从调制器获得的参考载波的同步检测来解调输入的多相数字相位调制波来利用通常包括在突发形式的信号中的前导码字。 另外，在相位调制波的接收开始时，采用开关电路向调制器提供来自加法器电路的解调输出，但是在参考载波建立之后，向调制器提供输出 解调器。

公开(公告)号：US2486041A

公开(公告)日：1949-10-25

申请号：US62702545

申请日：1945-11-06

申请人： COMP GENERALE ELECTRICITE

发明人： PIERRE LEROY ROBERT

IPC分类号： H04L27/227

CPC分类号： H04L27/2277

公开(公告)号：US20080076374A1

公开(公告)日：2008-03-27

申请号：US11901536

申请日：2007-09-19

申请人： Avraham Grenader

发明人： Avraham Grenader

IPC分类号： H04B1/10 ,  H04L27/156

CPC分类号： H04B1/1027 ,  H04L27/14 ,  H04L27/148 ,  H04L27/22 ,  H04L27/2277

摘要： Method for iterative multi-stage adaptive filtering of angle modulated passband and baseband signals based on varying of current value of instantaneous frequency to reach powerful noise canceling, by means of calculation and estimation of current value of instantaneous frequency by using demodulation and reversed modulation calculation process to estimate and calculate the current value of the said estimated instantaneous frequency, and applying narrower sub-bandwidth adaptive filtering, which follows in real-time after the said estimated instantaneous frequency, where the said instantaneous frequency is the central filtering frequency of the said sub-bandwidth filter.

摘要翻译： 基于瞬时频率电流值变化的角度调制通带和基带信号的迭代多级自适应滤波方法，通过使用解调和反调制计算过程计算和估计瞬时频率的当前值，实现强大的噪声消除 估计和计算所述估计的瞬时频率的当前值，以及应用较窄的子带宽自适应滤波，其在所述估计的瞬时频率之后实时跟随，其中所述瞬时频率是所述子频带的中心滤波频率 带宽过滤器

公开(公告)号：US06721366B1

公开(公告)日：2004-04-13

申请号：US09552029

申请日：2000-04-19

申请人： Nick Andrew Van Stralen

发明人： Nick Andrew Van Stralen

IPC分类号： H04L512

CPC分类号： H04L25/03273 ,  H04L27/2277 ,  H04L2027/0028 ,  H04L2027/004 ,  H04L2027/0055 ,  H04L2027/0067

摘要： A method establishes a phase reference signal for trellis demodulating CPM modulated received signals by using phase reference signals and symbol timing estimates. Branch metrics signals representing the highest-probability path through the trellis are calculated to produce beat estimates of the modulation data. The branch metrics signals are phase shifted to produce phase shifted branch metrics (PSBM) for each path. At each symbol interval, the highest probability PSEM (HPPSBM) signal for the path is selected. The selected phase shifted branch metric adjusts the value of the phase reference signals. Another method estimates the transmitted signal from at least the estimated data and the phase reference signal. The estimated transmitted signal is phase shifted to produce phase shifted estimated transmitted signals, which are correlated with the received data signals to produce phase error signals, which are smoothed and correct the phase reference signal.

摘要翻译： 一种方法通过使用相位参考信号和符号定时估计建立用于网格解调CPM调制接收信号的相位参考信号。 计算表示通过网格的最高概率路径的分支度量信号，以产生调制数据的节拍估计。 分支度量信号被相移以产生每个路径的相移分支度量（PSBM）。 在每个符号间隔，选择路径的最高概率PSEM（HPPSBM）信号。 所选择的相移分支度量调整相位参考信号的值。 另一种方法估计来自至少估计数据和相位参考信号的发射信号。 估计的发射信号被相移以产生相移的估计的发射信号，其与接收的数据信号相关，以产生相位误差信号，其被平滑并校正相位参考信号。