公开(公告)号：US20040114542A1

公开(公告)日：2004-06-17

申请号：US10318423

申请日：2002-12-13

Applicant: TIOGA TECHNOLOGIES LTD ,  STMicroelectronics Ltd.

Inventor： Danny Stopler

IPC: H04B003/20

CPC classification number: H04B3/23 ,  H04M9/082

Abstract: A receiver for receiving an incoming signal over a communication medium includes an echo canceller, which is adapted to receive an outgoing signal transmitted over the communication medium, and to process the outgoing signal using a set of variable processing coefficients in order to generate an echo cancellation signal. A summer combines the incoming signal with the echo cancellation signal so as to generate an echo-cancelled signal. An equalizer applies an equalization operation to the echo-cancelled signal so as to generate an equalized signal. A residual echo cancellation circuit processes the equalized signal so as to adaptively update the variable processing coefficients of the echo canceller.

Abstract translation: 用于通过通信介质接收输入信号的接收机包括回波消除器，其适于接收通过通信介质发送的输出信号，并且使用一组可变处理系数来处理输出信号，以便产生回声消除 信号。 夏天将输入信号与回波消除信号相结合，以产生回声消除信号。 均衡器对回波消除信号施加均衡操作，以产生均衡的信号。 残余回波消除电路处理均衡信号，以自适应地更新回波消除器的可变处理系数。

公开(公告)号：US20030169823A1

公开(公告)日：2003-09-11

申请号：US10057751

申请日：2002-01-24

Applicant: Tioga Technologies, Ltd.

Inventor： Guy Reina

IPC: H04K001/10 ,  H04L027/28

CPC classification number: H04L27/265 ,  G06F17/142 ,  H04L27/263

Abstract: A method and apparatus for extending the dynamic range of an integer or fixed-point Fast Fourier Transform (nullFFTnull) system that may be used in communications devices such as ADSL modems. The disclosed FFT system utilizes a shift control module to increase the effective dynamic range of the FFT implementation by selectively choosing at least one stage of an FFT butterfly implementation in which the outputs of the butterfly stage are not divided to otherwise avoid overflow problems.

Abstract translation: 一种用于扩展可用于诸如ADSL调制解调器的通信设备中的整数或定点快速傅里叶变换（“FFT”）系统的动态范围的方法和装置。 所公开的FFT系统利用移位控制模块通过选择性地选择蝶形执行的至少一个阶段来增加FFT实现的有效动态范围，其中蝴蝶阶段的输出不被分割以避免溢出问题。

公开(公告)号：US20040066738A1

公开(公告)日：2004-04-08

申请号：US10664088

申请日：2003-09-17

Applicant: Tioga Technologies, Ltd.

Inventor： Daniel Stopler

IPC: H04J011/00

CPC classification number: H04L1/0057 ,  H04L1/0041 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0071 ,  H04L27/2602

Abstract: An encoding/framing scheme for multitone modulation over impulsive channels which allows efficient operation in multipoint to point channels which are affected by ingress (narrowband noise) and impulsive (burst) interference. The coding is achieved using a concatenated approach, with the inner code being Trellis Coded Modulation (TCM), using, for example, convolutional coding, and the outer code being a Reed Solomon (RS) code. Two dimensional interleaving is performed, with one dimension being time, and the other dimension being frequency (tones or sub-channels). The TCM coding provided by the present invention is quite effective in dealing with impulse noise effects. The interleaving may be applied in two levels. According to one embodiment, user data is RS encoded, and a portion of the RS encoded data is interleaved and filled along columns for transmission using a multitone transmission system. The remaining portion of the RS encoded user data is then TCM encoded, interleaved and effectively filled along rows for subsequent transmission. In another embodiment, a portion of the user data is RS encoded, interleaved and filled along columns for transmission, while the remaining portion of the user data is instead TCM encoded, interleaved and effectively filled along rows for subsequent transmission. A diagonalization scheme is also used to provide immunity against impulse noise, while at the same time allowing for a simple method of utilizing tones of different loading. According to the diagonalization principle, data packets are spread over time in a diagonal fashion, such that an impulse noise affects more than one user's packets, with the effect on each being reduced. In this way, a code having lower redundancy can be used since the amount of corruption expected in one user's data packet will be reduced.

Abstract translation: 用于在脉冲通道上进行多音调制的编码/成帧方案，其允许在受入射（窄带噪声）和脉冲（突发））干扰影响的多点到多点通道中的有效操作。 使用级联方法实现编码，内部代码是网格编码调制（TCM），使用例如卷积编码，而外部代码是里德所罗门（RS）代码。 执行二维交织，一维是时间，另一维是频率（音调或子通道）。 本发明提供的TCM编码在处理脉冲噪声效应方面是非常有效的。 交错可以应用于两个层次。 根据一个实施例，用户数据被RS编码，并且RS编码数据的一部分被交错并沿着列填充，以便使用多音频传输系统进行传输。 RS编码的用户数据的剩余部分然后被TCM编码，交错和有效地沿着行填充以供后续传输。 在另一个实施例中，用户数据的一部分是沿着列进行RS编码，交织和填充以进行传输，而用户数据的剩余部分被替代地被TCM编码，交错并有效地沿着行填充以用于随后的传输。 对角化方案也用于提供抗脉冲噪声的抗扰性，同时允许使用不同负载色调的简单方法。 根据对角化原理，数据分组以对角线方式随时间扩散，使得脉冲噪声影响多于一个用户的分组，并且每个分组的影响被减小。 以这种方式，可以使用具有较低冗余度的代码，因为在一个用户的数据分组中预期的损坏量将减少。

公开(公告)号：US20030043925A1

公开(公告)日：2003-03-06

申请号：US09866870

申请日：2001-05-29

Applicant: Tioga Technologies, Ltd.

Inventor： Danny Stopler ,  Ram Zamir

IPC: H04B001/10 ,  H04B014/04

CPC classification number: H04L25/067 ,  H04L27/2647

Abstract: A system for detecting and correcting impulse noise present on an input data signal includes an impulse detector module receiving an input data signal and producing as output an correction enable signal indicating when an impulse correction is required. An impulse corrector module receives the input data signal and a correction enable signal and produces a corrected data signal, e.g., having the impulse canceled or blanked, as output. A reliability estimator and selector module receives the corrected data signal and the input data signal and selects as output the input signal which is more reliable. In one embodiment, the impulse detector includes first and second complementary impulse detectors, the outputs of which are analyzed by an enable and correction module to produce an impulse detection signal with improved accuracy. Preferably, the enable and correction module also indicates the most appropriate type of impulse correction in accordance with the detection signals from the complementary detectors. A novel system and method of detecting impulses based on Gram Schmidt techniques is also presented. In this method, one or more channels of a multi-channel data signal are kept free of data. When a whitening filter is applied, impulses on these quiet channels are emphasized. The Gram Schmidt technique exploits this fact to provide for improved impulse detection. The system can be modified to detect other types of low dimensionality noise.

Abstract translation: 用于检测和校正存在于输入数据信号上的脉冲噪声的系统包括：脉冲检测器模块，其接收输入数据信号，并产生指示何时需要脉冲校正的校正使能信号作为输出。 脉冲校正器模块接收输入数据信号和校正使能信号，并产生校正数据信号，例如使脉冲被消除或消隐，作为输出。 可靠性估计器和选择器模块接收校正的数据信号和输入数据信号，并选择更可靠的输入信号作为输出。 在一个实施例中，脉冲检测器包括第一和第二互补脉冲检测器，其输出由使能和校正模块分析以产生具有改进的精度的脉冲检测信号。 优选地，使能和校正模块还根据来自互补检测器的检测信号来指示最合适类型的脉冲校正。 还提出了一种基于Gram Schmidt技术检测脉冲的新颖系统和方法。 在该方法中，多信道数据信号的一个或多个信道被保存为没有数据。 当应用白化滤光片时，会强调这些静音通道上的脉冲。 Gram Schmidt技术利用这一事实来提供改进的脉冲检测。 可以修改系统以检测其他类型的低维度噪声。