公开(公告)号：US11683101B1

公开(公告)日：2023-06-20

申请号：US17534766

申请日：2021-11-24

申请人： Marvell Asia Pte, Ltd.

发明人： Damian Alfonso Morero ,  Mario Alejandro Castrillon ,  Ramiro Rogelio Lopez ,  Cristian Cavenio ,  Gabriel Infante ,  Mario Rafael Hueda

IPC分类号： H04B10/00 ,  H04B10/61 ,  H04L27/227 ,  H04L27/38 ,  H04B10/40 ,  H04J14/02

CPC分类号： H04B10/616 ,  H04B10/40 ,  H04B10/6161 ,  H04B10/6162 ,  H04L27/2275 ,  H04L27/3836 ,  H04J14/0298

摘要： A method and structure for probabilistic shaping and compensation techniques in coherent optical receivers. According to an example, the present invention provides a method and structure for an implementation of distribution matcher encoders and decoders for probabilistic shaping applications. The techniques involved avoid the traditional implementations based on arithmetic coding, which requires intensive multiplication functions. Furthermore, these probabilistic shaping techniques can be used in combination with LDPC codes through reverse concatenation techniques.

公开(公告)号：US09699011B1

公开(公告)日：2017-07-04

申请号：US15097026

申请日：2016-04-12

申请人： Marvell International Ltd.

发明人： Ankit Sethi ,  Swaroop Venkatesh

IPC分类号： H04B1/707 ,  H04L27/20 ,  H04L27/36 ,  H04W4/00

CPC分类号： H04L27/2017 ,  H04L27/2275 ,  H04L27/36 ,  H04W4/80

摘要： A device includes a frequency offset (FO) estimation circuit and a frequency offset compensation circuit coupled with the frequency offset estimation circuit. The frequency offset compensation circuit is configured to (i) receive a continuous phase modulation (CPM) signal, (ii) receive, from the FO estimation circuit, an uncompensated frequency offset for a wth sampling window of the CPM signal, (iii) generate a frequency offset compensation value for a w+1st sampling window of the CPM signal based on the uncompensated frequency offset for the wth sampling window, (iv) adjust the CPM signal in the w+1st sampling window based on the frequency offset compensation value, and (v) provide the adjusted CPM signal to a filter.

公开(公告)号：US20170171005A1

公开(公告)日：2017-06-15

申请号：US15376348

申请日：2016-12-12

申请人： International Business Machines Corporation

发明人： Matthew B. Baecher ,  Troy J. Beukema ,  Lamiaa Msalka

IPC分类号： H04L27/227 ,  H04L12/26 ,  H04L25/03

CPC分类号： H04L25/03057 ,  H04L7/0334 ,  H04L25/03273 ,  H04L25/03885 ,  H04L25/4917 ,  H04L27/02 ,  H04L27/2275 ,  H04L43/028 ,  H04Q9/06 ,  H04Q2213/03

摘要： Digital receiver systems and clock recovery techniques for use in digital receiver systems are provided to implement asynchronous baud-rate clock recovery systems for high data rate serial receivers multilevel line modulation. A two-stage postcursor ISI equalization system is provided to efficiently emulate a 4-level DFE (decision feedback equalization) system, for example, while converting a 4-level equalized signal to s 2-level equalized signal. For example, a two stage postcursor ISI equalization system includes a DFE stage which operates on a most significant component of a given 4-level data symbol, followed by a DFFE (decision-feedforward equalizer) stage which operates on a least significant component of the given 4-level data symbol. In parallel with the DFFE stage, an estimate of the least significant component is subtracted from the equalized 4-level data symbol to convert the 4-level data symbol to a 2-level symbol.

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：US09634873B1

公开(公告)日：2017-04-25

申请号：US15146368

申请日：2016-05-04

申请人： NATIONAL CHIAO TUNG UNIVERSITY

发明人： Chi-Yi Lo ,  Hao-Chiao Hong

IPC分类号： H03K9/06 ,  H04L27/22 ,  H04L27/227 ,  H04L7/00 ,  H04L7/033

CPC分类号： H04L27/2275 ,  H03D3/00

摘要： The present invention discloses BPSK demodulator, which uses a delay circuit to delay a BPSK signal and mixes the delayed BPSK signal with the undelayed BPSK signal to output a demodulated data signal, and which uses a phase rotation circuit and the demodulated data signal to obtain a carrier clock signal. The operating frequency of the delay circuit is the same as or 0.5 times the carrier frequency. Therefore, the present invention consumes less power and is realized by digital circuits and analog circuits.

公开(公告)号：US20150280952A1

公开(公告)日：2015-10-01

申请号：US14595905

申请日：2015-01-13

申请人： MITRE Corporation

发明人： Galigekere Ramaswamy Dattatreya

IPC分类号： H04L27/227 ,  H04L27/26

CPC分类号： H04L27/2275 ,  H04L27/22 ,  H04L27/2613 ,  H04L2027/0024 ,  H04L2027/0067 ,  H04L2027/0087

摘要： During transmission of a signal, a decoder receives a data symbol sequence and one or more copies of the data symbol sequence. The data symbol sequence and each of the copies have unknown noise, including unknown phase shifts. The unknown phase shifts are estimated such that the data symbol sequence that was transmitted is substantially recovered.

摘要翻译： 在传输信号期间，解码器接收数据符号序列和数据符号序列的一个或多个拷贝。 数据符号序列和每个副本具有未知的噪声，包括未知的相移。 估计未知的相移，使得发送的数据符号序列基本恢复。

公开(公告)号：US08897350B2

公开(公告)日：2014-11-25

申请号：US14309626

申请日：2014-06-19

申请人： Panasonic Corporation

发明人： Hiroki Mouri ,  Kouichi Nagano ,  Hiroyuki Tezuka

IPC分类号： H04B3/46 ,  H04B17/00 ,  H04Q1/20 ,  H04L7/00

CPC分类号： H04L7/0016 ,  H04L27/2275 ,  H04L27/3818

摘要： A phase adjuster arranges phases of waveforms of a complex signal after orthogonal transform. An edge detector detects an edge of the complex signal after phase adjustment. A phase shift detector detects phase shift of an output signal of the edge detector between the in-phase signal and the quadrature signal after the orthogonal transform, and outputs a phase error signal (PE). The oscillator connected to mixers and a shifter to perform the orthogonal transform includes a phase adjustment section adjusting an edge of a voltage controlled oscillator (VCO) clock based on the phase error signal (PE) and correcting the phase shift of an original signal.

摘要翻译： 相位调整器在正交变换后布置复信号的波形的相位。 边缘检测器在相位调整后检测复信号的边沿。 相移检测器检测正交变换后的同相信号和正交信号之间的边缘检测器的输出信号的相移，并输出相位误差信号（PE）。 连接到混频器的振荡器和用于执行正交变换的移位器包括相位调整部分，其基于相位误差信号（PE）调节压控振荡器（VCO）时钟的边沿并校正原始信号的相移。

公开(公告)号：US07809086B2

公开(公告)日：2010-10-05

申请号：US11836141

申请日：2007-08-08

申请人： Wang Tingwu ,  Pan Ju Yan ,  Yu Yang ,  Hu Saigui ,  Tomisawa Masayuki

发明人： Wang Tingwu ,  Pan Ju Yan ,  Yu Yang ,  Hu Saigui ,  Tomisawa Masayuki

IPC分类号： H03K9/00 ,  H04L27/00

CPC分类号： H04L27/233 ,  H04L27/0014 ,  H04L27/22 ,  H04L27/2275 ,  H04L2027/0026

摘要： An apparatus for demodulating an analogue input signal comprises a hard limiter stage (4) for converting the signal to a two level signal. A digital down converter/low pass filter stage (6) converts the signal to a base band signal, and a symbol synchronization stage (8) extracts symbol timing. An instantaneous phase detector (10) calculates the instantaneous phase of the one or more symbols associated with the input signal. If the input signal has been modulated according to a pi/4DQPSK, pi/2DBPSK, GMSK, or a GFSK modulation scheme, a differential detector (12) determines a difference in the phase between adjacent symbols, a coarse frequency offset compensation stage (14) applies a compensation signal to compensate for frequency offset, and a frequency offset estimation stage (16) updates this compensation signal. A demapper (18) generates a demodulated output signal after compensation by the frequency offset compensation stage.

摘要翻译： 用于解调模拟输入信号的装置包括用于将信号转换为两电平信号的硬限幅器级（4）。 数字下变频器/低通滤波器级（6）将信号转换为基带信号，符号同步级（8）提取符号定时。 瞬时相位检测器（10）计算与输入信号相关联的一个或多个符号的瞬时相位。 如果输入信号已经根据pi / 4DQPSK，pi / 2DBPSK，GMSK或GFSK调制方案调制，则差分检测器（12）确定相邻符号之间的相位差，粗频率偏移补偿级（14 ）施加补偿信号以补偿频率偏移，并且频率偏移估计级（16）更新该补偿信号。 解映射器（18）通过频率偏移补偿级在补偿后产生解调输出信号。

公开(公告)号：US07764937B2

公开(公告)日：2010-07-27

申请号：US12235757

申请日：2008-09-23

申请人： Aleksej Makarov

发明人： Aleksej Makarov

IPC分类号： H04B17/00 ,  H04B1/18 ,  H04B1/00 ,  H03D3/22 ,  H04L27/22

CPC分类号： H04L27/2332 ,  H04L27/2275 ,  H04L2027/0065 ,  H04L2027/0087

摘要： Counter-clockwise and clockwise quadrant transitions are detected and accumulated with respect to a received complex signal over a certain time period. These transitions may then be compared in order to obtain information indicative of both a magnitude and phase of a carrier frequency error for the received signal. Additionally, zero-crossings of the received complex signal over the same certain time period are detected and accumulated. The accumulated crossings provide information indicative of frequency offset magnitude. The determined magnitude and phase of the frequency error may then be used to adjust a local oscillator frequency to provide for improved receiver performance.

摘要翻译： 在一段时间内相对于接收的复合信号检测并累积逆时针和顺时针象限转换。 然后可以比较这些转变，以获得指示接收信号的载波频率误差的幅度和相位的信息。 此外，检测并累积在相同的特定时间段内接收到的复信号的零交叉。 累积的交叉点提供指示频率偏移幅度的信息。 然后可以使用所确定的频率误差的幅度和相位来调整本地振荡器频率以提供改进的接收机性能。

公开(公告)号：US07593454B2

公开(公告)日：2009-09-22

申请号：US11314123

申请日：2005-12-21

申请人： Donald John Rasmussen

发明人： Donald John Rasmussen

IPC分类号： H04B1/00 ,  H04L7/00

CPC分类号： H04B1/7085 ,  H04L27/2275

摘要： A method of correcting phase error of a phase shift keyed (PSK) signal includes (a) receiving a signal modulated by a spreading sequence; (b) despreading the received signal using a receiver spreading sequence similar to the spreading sequence of step (a); (c) calculating a crosscorrelation profile between the receiver spreading sequence and the received signal; and (d) calculating an autocorrelation profile of the receiver spreading sequence to determine a spreading code property (SCP). The method also includes (e) estimating a timing error in alignment between the autocorrelation and the crosscorrelation profiles; and (f) correcting a phase error of the signal despread in step (c), by using the SCP and the estimated timing error.

摘要翻译： 校正相移键控（PSK）信号的相位误差的方法包括：（a）接收由扩展序列调制的信号; （b）使用类似于步骤（a）的扩展序列的接收机扩展序列解扩接收信号; （c）计算接收机扩展序列与接收信号之间的互相关分布; 和（d）计算接收机扩展序列的自相关分布以确定扩展码属性（SCP）。 该方法还包括（e）估计自相关和互相关分布之间的对准的定时误差; 以及（f）通过使用SCP和估计的定时误差来校正在步骤（c）中解扩的信号的相位误差。