公开(公告)号：US5627885A

公开(公告)日：1997-05-06

申请号：US195628

申请日：1994-02-14

申请人： Eric Paneth ,  Mordechai Segal ,  Boaz Rippin ,  Ehud H. Rokach

发明人： Eric Paneth ,  Mordechai Segal ,  Boaz Rippin ,  Ehud H. Rokach

IPC分类号： H03H21/00 ,  H04B3/23 ,  H04L7/04 ,  H04L7/06 ,  H04L7/10 ,  H04L25/00 ,  H04L25/03 ,  H04L25/48 ,  H04M11/00

CPC分类号： H04L25/00 ,  H04B3/23 ,  H04L25/03057 ,  H04L25/03866 ,  H04L7/043 ,  H04L7/06 ,  H04L7/10

摘要： Analog signals representing individual digital values (.+-.1, .+-.3) pass through a telephone line to a receiver. These signals may be first provided in a pseudo random sequence. A linear echo canceller and a first adder eliminate, to an extent, echo signals resulting from second analog signals transmitted on the same telephone line by the receiver. A non-linear echo canceller and a second adder further reduce the echo signals and specifically reduce non-linear components in the echo signals. Adjustable signal delays achieve optimal performance of the linear and non-linear echo cancellers. An equalizer containing four (4) different modules then compensates for signal distortions introduced by the telephone line and minimizes the effect of noise in the telephone line. The equalizer modules are a digital gain control element, a feed forward digital filter and two (2) feedback digital filters. A detector module produces in one of several different ways at the receiver an estimate of the digital data (.+-.1, .+-.3) transmitted at the other end of the telephone line. The detector either extracts the digital information based on peaks in the received (non-equalized) signal or by adding the equalized signals with preset threshold values. A scrambler-descrambler module locally generates a replica of the digital symbols transmitted in analog form at the other end of the telephone line, based on a limited number (e.g. 23) of correctly detected digital values. The scrambler-descrambler module may also operate as a descrambler to recover data scrambled by the transmitter at the other end.

摘要翻译： 表示各个数字值（+/- 1，+/- 3）的模拟信号通过电话线路传送到接收器。 这些信号可以首先以伪随机序列提供。 线性回波消除器和第一加法器在一定程度上消除由接收器在相同电话线上发送的第二模拟信号产生的回波信号。 非线性回波消除器和第二加法器进一步减少回波信号并且具体地减少回波信号中的非线性分量。 可调节的信号延迟实现了线性和非线性回波消除器的最佳性能。 包含四（4）个不同模块的均衡器然后补偿由电话线引入的信号失真，并最大限度地减少电话线路中噪声的影响。 均衡器模块是数字增益控制元件，前馈数字滤波器和两（2）个反馈数字滤波器。 检测器模块在接收机处以几种不同的方式之一产生在电话线的另一端传输的数字数据（+/- 1，+/- 3）的估计。 检测器根据接收（非均衡）信号中的峰值提取数字信息，或通过将均衡信号与预设阈值相加。 扰码解扰器模块基于有限数量（例如23个）正确检测的数字值本地生成在电话线的另一端以模拟形式传输的数字符号的副本。 加扰器解扰器模块还可以作为解扰器来操作，以恢复另一端由发射机加扰的数据。

公开(公告)号：US5778055A

公开(公告)日：1998-07-07

申请号：US717248

申请日：1996-09-20

申请人： Eric Paneth ,  Mordechai Segal ,  Boaz Rippin ,  Ehud H. Rokach

发明人： Eric Paneth ,  Mordechai Segal ,  Boaz Rippin ,  Ehud H. Rokach

IPC分类号： H03H21/00 ,  H04B3/23 ,  H04L7/04 ,  H04L7/06 ,  H04L7/10 ,  H04L25/00 ,  H04L25/03 ,  H04L25/48 ,  H04M11/00

CPC分类号： H04L25/00 ,  H04B3/23 ,  H04L25/03057 ,  H04L25/03866 ,  H04L7/043 ,  H04L7/06 ,  H04L7/10

摘要： Analog signals representing individual digital values (.+-.1, .+-.3) pass through a telephone line to a receiver. These signals may be first provided in a pseudo random sequence. A linear echo canceller and a first adder eliminate, to an extent, echo signals resulting from second analog signals transmitted on the same telephone line by the receiver. A non-linear echo canceller and a second adder further reduce the echo signals and specifically reduce non-linear components in the echo signals. Adjustable signal delays achieve optimal performance of the linear and non-linear echo cancellers. An equalizer containing four (4) different modules then compensates for signal distortions introduced by the telephone line and minimizes the effect of noise in the telephone line. The equalizer modules are a digital gain control element, a feed forward digital filter and two (2) feedback digital filters. A detector module produces in one of several different ways at the receiver an estimate of the digital data (.+-.1, .+-.3) transmitted at the other end of the telephone line. The detector either extracts the digital information based on peaks in the received (non-equalized) signal or by adding the equalized signals with preset threshold values. A scrambler-descrambler module locally generates a replica of the digital symbols transmitted in analog form at the other end of the telephone line, based on a limited number (e.g. 23) of correctly detected digital values. The scrambler-descrambler module may also operate as a descrambler to recover data scrambled by the transmitter at the other end.

摘要翻译： 表示各个数字值（+/- 1，+/- 3）的模拟信号通过电话线路传送到接收器。 这些信号可以首先以伪随机序列提供。 线性回波消除器和第一加法器在一定程度上消除由接收器在相同电话线上发送的第二模拟信号产生的回波信号。 非线性回波消除器和第二加法器进一步减少回波信号并且具体地减少回波信号中的非线性分量。 可调节的信号延迟实现了线性和非线性回波消除器的最佳性能。 包含四（4）个不同模块的均衡器然后补偿由电话线引入的信号失真，并最大限度地减少电话线路中噪声的影响。 均衡器模块是数字增益控制元件，前馈数字滤波器和两（2）个反馈数字滤波器。 检测器模块在接收机处以几种不同的方式之一产生在电话线的另一端传输的数字数据（+/- 1，+/- 3）的估计。 检测器根据接收（非均衡）信号中的峰值提取数字信息，或通过将均衡信号与预设阈值相加。 扰码解扰器模块基于有限数量（例如23个）正确检测的数字值本地生成在电话线的另一端以模拟形式传输的数字符号的副本。 加扰器解扰器模块还可以作为解扰器来操作，以恢复另一端由发射机加扰的数据。

公开(公告)号：US06647069B1

公开(公告)日：2003-11-11

申请号：US09302872

申请日：1999-04-30

申请人： Mordechai Segal ,  Ofir Shalvi ,  Zvi Reznic

发明人： Mordechai Segal ,  Ofir Shalvi ,  Zvi Reznic

IPC分类号： H04L2710

CPC分类号： H04N21/2383 ,  H04N7/102 ,  H04N21/4382

摘要： In a cable television (CATV) data communication network, channel throughput and communications robustness are increased in a manner that improves speed of data transmission while maintaining compatibility with existing specifications and equipment. Enhanced throughput can be realized using the return channel of the CATV network. Alternatively, data retransmission and/or diversity techniques can be used to improve throughput.

摘要翻译： 在有线电视（CATV）数据通信网络中，以提高数据传输速度同时保持与现有规格和设备的兼容性的方式来增加信道吞吐量和通信鲁棒性。 可以使用CATV网络的返回通道实现增强的吞吐量。 或者，可以使用数据重传和/或分集技术来提高吞吐量。

公开(公告)号：US5710797A

公开(公告)日：1998-01-20

申请号：US447410

申请日：1995-05-23

申请人： Mordechai Segal ,  Ofir Shalvi

发明人： Mordechai Segal ,  Ofir Shalvi

IPC分类号： H04J1/12 ,  H04L5/06 ,  H04L27/06

CPC分类号： H04L5/06 ,  H04J1/12 ,  Y02B60/50

摘要： A single transducer digital communication receiver is described which is capable of extracting the data bits of at least one desired signal in the presence of interfering signals of similar type. The present invention also seeks to provide a communication system in which overlapping transmissions are tolerated and allowed. The present invention describes a design for a digital communication system, according to a specific frequency plan, which includes an appropriate digital demodulator that extracts the data bits of the desired signal(s) in the presence of closely spaced signals. The present invention enables reduced channel spacing in digital communication systems and thereby increases the system capacity (i.e. the number of users per bandwidth unit) without incurring any significant loss in system performance (e.g. power margins, BER, and channel availability). It also allows a reduced power margin that is required to maintain a pre-specified performance level without sacrificing system capacity. These two factors, power margin and system capacity, play a central role in the design and construction of state-of-the-art digital communication systems which seek to pack more users on the same frequency band without incurring significant power loss. Thus, the present invention also provides a method and apparatus for upgrading existing systems such as a cellular system for mobile wireless communications that is based on the IS-54 or the GSM standard.

摘要翻译： 描述了一种单个换能器数字通信接收机，其能够在存在类似类型的干扰信号的情况下提取至少一个期望信号的数据位。 本发明还寻求提供一种通信系统，其中允许和允许重叠传输。 本发明描述了一种根据特定频率规划的数字通信系统的设计，该设计包括在存在紧密间隔的信号的情况下提取所需信号的数据位的适当的数字解调器。 本发明能够减少数字通信系统中的信道间隔，从而增加系统容量（即，每个带宽单元的用户数量），而不会导致系统性能（例如功率余量，BER和信道可用性）的任何显着损失。 它还允许在不牺牲系统容量的情况下维持预定义的性能水平所需的功率裕度降低。 这两个因素，功率余量和系统容量，在设计和建造最先进的数字通信系统中起着核心作用，这些数字通信系统试图在相同的频带上打包更多的用户，而不会导致显着的功率损耗。 因此，本发明还提供了一种用于升级现有系统的方法和装置，例如基于IS-54或GSM标准的用于移动无线通信的蜂窝系统。

公开(公告)号：US06647070B1

公开(公告)日：2003-11-11

申请号：US09392598

申请日：1999-09-09

申请人： Ofir Shalvi ,  Mordechai Segal ,  Zvi Reznic

发明人： Ofir Shalvi ,  Mordechai Segal ,  Zvi Reznic

IPC分类号： H04B1500

CPC分类号： H04L25/03178 ,  H04L1/004 ,  H04L25/497

摘要： This invention is particularly useful as a system for digital communications over channels that suffer from impulse noise, and particularly over return cable TV channels, downstream cable TV channels, and digital subscriber loops (DSL) channels for high speed communications over twisted pair copper lines.

摘要翻译： 本发明特别适用于通过经受脉冲噪声的信道的数字通信系统，特别是通过双绞线铜线路进行高速通信的有线TV频道，下行有线电视频道和数字用户回路（DSL）信道。

公开(公告)号：US06581177B1

公开(公告)日：2003-06-17

申请号：US09303333

申请日：1999-04-30

申请人： Mordechai Segal ,  Ofir Shalvi

发明人： Mordechai Segal ,  Ofir Shalvi

IPC分类号： H03M1300

CPC分类号： H04L1/1819 ,  H04L1/1671 ,  H04L1/1845 ,  H04L1/189 ,  H04L12/413

摘要： A collision-based multi-access system is described which is capable of recovering collisions by means of jointly detecting the mutually interfering signals, followed by re-transmission of functions of portions of some of the colliding signals. This system reduces the amount of required re-transmission of all of the colliding signals, decreasing the amount of re-transmission in the system, increasing the system throughput. The system is also applicable to non-colliding communications systems to correct interference due to noise.

摘要翻译： 描述了一种基于冲突的多址系统，其能够通过共同检测相互干扰的信号来恢复冲突，随后重新发送一些冲突信号的部分的功能。 该系统减少了所有冲突信号的所需重新传输量，减少了系统中的重传量，增加了系统吞吐量。 该系统还适用于非碰撞通信系统，以纠正噪声造成的干扰。

公开(公告)号：US20070288977A1

公开(公告)日：2007-12-13

申请号：US11770856

申请日：2007-06-29

申请人： Ofir Shalvi ,  Mordechai Segal

发明人： Ofir Shalvi ,  Mordechai Segal

IPC分类号： H04N7/173

CPC分类号： H04N21/437 ,  H04N7/17309 ,  H04N21/615

摘要： A method, device and network for compressing cable modem data signals and conserving bandwidth within the network. Cable modems transmit upstream data signals to a fiber node which compresses the data signals and transmits the compressed signals upstream to a headend which decompresses the data signals. The fiber node compression may be by a shaping filter or a fast Fourier transform (FFT) function. The headend decompression may be by an inverse shaping filter or an inverse FFT function.

摘要翻译： 一种用于压缩电缆调制解调器数据信号并节省网络内带宽的方法，设备和网络。 电缆调制解调器将上行数据信号发送到光纤节点，该光纤节点压缩数据信号，并将压缩信号上行传输到解压缩数据信号的头端。 光纤节点压缩可以是整形滤波器或快速傅里叶变换（FFT）功能。 前端解压缩可以是逆整形滤波器或逆FFT函数。

公开(公告)号：US06366613B2

公开(公告)日：2002-04-02

申请号：US09755813

申请日：2001-01-05

申请人： Naftali Sommer ,  Ofir Shalvi ,  Mordechai Segal

发明人： Naftali Sommer ,  Ofir Shalvi ,  Mordechai Segal

IPC分类号： H03H730

CPC分类号： H04N5/211 ,  H03H21/0012 ,  H04L25/03057 ,  H04L2025/03382 ,  H04L2025/0342 ,  H04L2025/0349 ,  H04N5/4401

摘要： An adaptive equalizer capable of tracking rapid channel variations while maintaining high stability and low jitter, and a receiver constructed therefrom. A novel feature of the invention is that is that the equalizer is sectioned, that is constructed from a plurality of feed-forward sections and decision-feedback sections, where these sections comprise a cascade of an adaptive linear filter and an adaptive multiplier. This structure is effective at combating rapid channel variations, which are a result of delay variations of the reflections of the signal, e.g., airplane flutter, without sacrificing the stability and the accuracy of the equalizer even in cases where the equalizer has a large number of taps. The different equalizer sections may have different step size parameters. A controller monitors the channel variations and adjusts the step size parameters of each section accordingly. The controller increases the step sizes of the equalizer sections that are able to compensate for the variation of the channel and does not increase the step sizes of the other sections. This allows the equalizer to combat rapid channel variations without sacrificing stability and accuracy. The present invention is particularly suitable to high speed wireless RF digital communications applications, e.g., to DTV broadcast applications, where the equalizer is characterized by a large number of taps and the signal is subject to rapid time varying reflections due to movement of objects such as cars and airplanes.

摘要翻译： 一种能够跟踪快速通道变化同时保持高稳定性和低抖动的自适应均衡器，以及由其构成的接收器。 本发明的一个新颖特征在于，均衡器被分段，其由多个前馈部分和判定反馈部分构成，其中这些部分包括自适应线性滤波器和自适应乘法器的级联。 这种结构有效地对抗快速通道变化，这是由于信号的反射的延迟变化（例如，飞机颤动）而不牺牲均衡器的稳定性和精度的结果，即使在均衡器具有大量的 水龙头 不同的均衡器部分可以具有不同的步长参数。 控制器监视通道变化并相应调整每个部分的步长参数。 控制器增加了能够补偿通道变化的均衡器部分的步长，并且不增加其它部分的步长。 这允许均衡器在不牺牲稳定性和准确性的情况下对抗快速通道变化。 本发明特别适用于高速无线RF数字通信应用，例如，对于DTV广播应用，其中均衡器的特征在于大量的抽头，并且该信号由于诸如以下的对象的移动而经受快速的时变反射 汽车和飞机。

公开(公告)号：US08214871B2

公开(公告)日：2012-07-03

申请号：US11770856

申请日：2007-06-29

申请人： Ofir Shalvi ,  Mordechai Segal

发明人： Ofir Shalvi ,  Mordechai Segal

IPC分类号： H04N7/173

CPC分类号： H04N21/437 ,  H04N7/17309 ,  H04N21/615

摘要： A method, device and network for compressing cable modem data signals and conserving bandwidth within the network. Cable modems transmit upstream data signals to a fiber node which compresses the data signals and transmits the compressed signals upstream to a headend which decompresses the data signals. The fiber node compression may be by a shaping filter or a fast Fourier transform (FFT) function. The headend decompression may be by an inverse shaping filter or an inverse FFT function.

摘要翻译： 一种用于压缩电缆调制解调器数据信号并节省网络内带宽的方法，设备和网络。 电缆调制解调器将上行数据信号发送到光纤节点，该光纤节点压缩数据信号，并将压缩信号上行传输到解压缩数据信号的头端。 光纤节点压缩可以是整形滤波器或快速傅里叶变换（FFT）功能。 前端解压缩可以是逆整形滤波器或逆FFT函数。

公开(公告)号：US07136422B2

公开(公告)日：2006-11-14

申请号：US11222276

申请日：2005-09-08

申请人： Mordechai Segal ,  Ofir Shalvi ,  Zvi Reznic

发明人： Mordechai Segal ,  Ofir Shalvi ,  Zvi Reznic

IPC分类号： H04L27/00 ,  H04L27/22

CPC分类号： H04N21/2383 ,  H04N7/102 ,  H04N21/4382

摘要： In a cable television (CATV) data communication network, channel throughput and communications robustness are increased in a manner that improves speed of data transmission while maintaining compatibility with existing specifications and equipment. Enhanced throughput can be realized using the return channel of the CATV network. Alternatively, data retransmission and/or diversity techniques can be used to improve throughput.