公开(公告)号：US06618696B1

公开(公告)日：2003-09-09

申请号：US09332129

申请日：1999-06-14

Applicant: Richard A. Dean ,  Steven William Roberts ,  Mark George Jacobs ,  Ronald E. Krebs

Inventor： Richard A. Dean ,  Steven William Roberts ,  Mark George Jacobs ,  Ronald E. Krebs

IPC: G06G748

CPC classification number: H04W16/22 ,  H04B17/391 ,  H04L1/241

Abstract: The present invention is a method of simulating the effects of a plurality of channels on a signal that includes the steps of acquiring a state transition matrix for each of said plurality of channels; acquiring an error matrix for each of said plurality of channels; selecting the first channel to be simulated; assuming that the signal is in a particular state; receiving the signal; generating a first number; determining the state to which the signal transitions; transitioning the signal to the state determined in the last step; generating a second number; determining what errors, if any, to inject into the signal by comparing the second number to entries in the column of the error matrix of the corresponding channel that matches the state of the signal; if one of the errors determined in the last step is lost signal then discarding the signal, not injecting any other error into the signal, selecting another channel if the user desires, assuming that the next signal selected is in the same state to which the previous signal transitioned, returning to the fifth step if another channel is selected, and transmitting the signal if another channel is not selected; and injecting the errors determined in the tenth step into the signal, selecting another channel if the user desires, returning to the fifth step if another channel is selected, assuming that the next signal selected is in the same state to which the previous signal transitioned, and transmitting the signal if another channel is not selected.

Abstract translation: 本发明是一种模拟多个信道对信号的影响的方法，包括以下步骤：获取所述多个信道中的每个信道的状态转移矩阵; 获取所述多个通道中的每一个的误差矩阵; 选择要模拟的第一个通道; 假设信号处于特定状态; 接收信号; 产生第一个数字; 确定信号转换到的状态; 将信号转换到在最后一步确定的状态; 产生第二个数字; 通过将第二数量与符合信号状态的相应通道的误差矩阵的列中的条目进行比较来确定将什么错误（如果有的话）注入到信号中; 如果在最后一步确定的错误之一丢失信号，则丢弃该信号，而不向该信号中注入任何其他错误，如果用户期望，则选择另一个信道，假设所选择的下一个信号处于与之前相同的状态 信号转换，如果选择另一个信道，返回到第五步，如果没有选择另一个信道，则发送信号; 并且将在第十步骤中确定的错误注入到信号中，如果用户期望，则选择另一个信道，假设所选择的下一个信号处于与先前信号转换到的相同状态，则返回到第五步骤，如果选择另一个信道， 如果没有选择另一个信道，则发送信号。

公开(公告)号：US06501804B1

公开(公告)日：2002-12-31

申请号：US09297859

申请日：1999-05-07

Applicant: Dietmar Rudolph ,  Christian Hoerlle ,  Andreas Schaefer

Inventor： Dietmar Rudolph ,  Christian Hoerlle ,  Andreas Schaefer

IPC: H04B1500

CPC classification number: H04B1/123 ,  H04L1/241 ,  H04L1/242

Abstract: A method for the transmission of digital signals, particularly in the AM bands (broadcasting bands), with high-level modulation, preferably 32 APSK or 64 ASPK, being used for data blocks to be transmitted. At the receiving end, time-periodic measurements of a noise are carried out and noise signals determined therefrom are subtracted from received signals.

Abstract translation: 用于传输数字信号的方法，特别是在具有高级调制（优选32APSK或64ADKK）的AM频带（广播频带）中，用于要发送的数据块。 在接收端，执行噪声的时间周期测量，并从接收到的信号中减去从其确定的噪声信号。

公开(公告)号：US06374375B1

公开(公告)日：2002-04-16

申请号：US08853300

申请日：1997-05-09

Applicant: Philip C. Yip ,  Muhammad M. Rahmatullah ,  Terry L. Cole

Inventor： Philip C. Yip ,  Muhammad M. Rahmatullah ,  Terry L. Cole

IPC: G01R3128

CPC classification number: H04L1/242 ,  H04L1/241

Abstract: A method and apparatus for allowing a modem transmitting data in the data mode to initiate retraining mode due to changing line conditions. The modem inserts a test signal within the data received from a computer system. The data and test signal are encoded and sent over a network to a second modem. The second modem compares the test signal with a standard test signal, and if the test signal received is different from the standard test signal, the second modem initiates retraining of the modems to adjust for the varying line conditions.

Abstract translation: 一种用于允许调制解调器在数据模式中发送数据以由于改变线路条件而发起再训练模式的方法和装置。 调制解调器将测试信号插入到从计算机系统接收的数据中。 数据和测试信号被编码并通过网络发送到第二调制解调器。 第二调制解调器将测试信号与标准测试信号进行比较，并且如果接收的测试信号与标准测试信号不同，则第二调制解调器启动调制解调器的再训练以针对变化的线路条件进行调整。

公开(公告)号：US6069876A

公开(公告)日：2000-05-30

申请号：US798752

申请日：1997-02-13

Applicant: Emil Lander ,  Stephen D. Cadieux

Inventor： Emil Lander ,  Stephen D. Cadieux

IPC: H04L1/24 ,  H04L12/56 ,  H04Q11/04 ,  G01R31/08

CPC classification number: H04Q11/0478 ,  H04L1/241 ,  H04L1/243 ,  H04L2012/5628

Abstract: Telecommunications networks require a variety of tests to monitor their proper operations. Performance monitoring (and fault detection) of the physical layer of a transmission system is one of them and is usually accomplished by using a bit error rate test (BERT). The BERT of the invention uses modified ATM idle cells to conduct one-way, bidirectional and loopback BERT. ATM idle cells are loaded with BERT data at the transmit end and recovered at the receive end. The BERT data are processed according to the different data rates of the ATM transmission system. Performance parameters are derived from the received BERT data. The disclosure describes a method as well as a system for performing such a test.

Abstract translation: 电信网络需要进行各种测试来监控其正常运行。 传输系统的物理层的性能监视（和故障检测）是其中之一，通常通过使用误码率测试（BERT）来完成。 本发明的BERT使用修改的ATM空闲小区来进行单向，双向和环回BERT。 ATM空闲单元在发送端装入BERT数据，并在接收端恢复。 根据ATM传输系统的不同数据速率处理BERT数据。 性能参数是从接收到的BERT数据导出的。 本公开描述了一种方法以及用于执行这种测试的系统。

公开(公告)号：US5666378A

公开(公告)日：1997-09-09

申请号：US215129

申请日：1994-03-18

Applicant: Robert F. Marchetto ,  Todd A. Stewart ,  Glenn S. Fawcett

Inventor： Robert F. Marchetto ,  Todd A. Stewart ,  Glenn S. Fawcett

IPC: H04H20/67 ,  H04L1/00 ,  H04L1/24 ,  H04L7/00 ,  H04L7/04 ,  H04L27/34 ,  H04B1/38

CPC classification number: H04H20/67 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/241 ,  H04L1/242 ,  H04L27/34 ,  H04L27/3416 ,  H04L7/041 ,  H04L7/043 ,  H04L7/0083 ,  H04L7/046

Abstract: A modulator that modulates and encodes data using data symbols, interspersed with pilot symbols, for transmission to another modem, and a demodulator that decodes data symbols of a signal received from another modem. In the demodulator, a received signal is sampled at four times the symbol rate. The sampled signal is converted to quadrature signals and low-pass filtered to produce a complex baseband signal. Data symbols in the complex baseband signal are sampled in synchronization with the start of each symbol based on the pilot symbols that are interspersed in the signal. By processing the pilot symbols, full modem synchronization is maintained down to a very low signal-to-noise ratio, through noise bursts, or even when the data symbols representing data are replaced by predefined sequences of data symbols that convey the dots and dashes of Morse code identifying the station transmitting the modulated signal. The continued presence of pilot symbols interspersed with the sequences of data symbols conveying Morse code prevents loss of synchronization between the transmitting station and the receiving station. The pilot symbols are also used to update equalizer tap coefficients in an equalizer of the demodulator, thereby minimizing errors in the output data caused by channel fading, noise, and other effects. In addition, the sequence of pilot symbols is used to delimit data frames, so that bit synchronization and frame synchronization in the data are not required.

Abstract translation: 使用散布有导频符号的数据符号来调制和编码数据的调制器，用于传输到另一个调制解调器，以及解调器，其解码从另一个调制解调器接收的信号的数据符号。 在解调器中，以符号率的四倍采样接收信号。 采样信号被转换成正交信号，低通滤波以产生复基带信号。 基于散布在信号中的导频符号，复数基带信号中的数据符号与每个符号的开始同步地采样。 通过处理导频符号，完全调制解调器同步通过噪声突发维持到非常低的信噪比，或者甚至当代表数据的数据符号被传送数据符号的预定义序列代替时 莫尔斯电码识别发射调制信号的电台。 继续存在散布有传送莫尔斯电码的数据符号序列的导频符号防止发射台与接收台之间的同步丢失。 导频符号还用于更新解调器的均衡器中的均衡器抽头系数，从而最小化由信道衰落，噪声和其他影响引起的输出数据中的误差。 另外，使用导频符号序列来定界数据帧，从而不需要数据中的位同步和帧同步。

公开(公告)号：US5555507A

公开(公告)日：1996-09-10

申请号：US295650

申请日：1994-08-26

Applicant: Andreas Wolf ,  Hans W. Arweiler

Inventor： Andreas Wolf ,  Hans W. Arweiler

IPC: G01R27/28 ,  H04B3/46 ,  H04L1/24

CPC classification number: H04L1/242 ,  H04L1/241

Abstract: The transmission path (4) is fed with a test signal (M'), which is generated from a sequence (m) of spectral components (S1 . . . S10), which are distributed equidistantly in the frequency domain, as the result of combining with an additional function (ZSF). The additional function (ZSF) is selected so as to allow the test signal (M') to contain, besides the spectral components (S1 . . . S10)of the sequence (m), additional spectral components (ZS1 . . . ZS21). An output signal (M") received on the output side of the path is evaluated at evaluation frequencies (AW1 . . . AW10), in the case of which the test signal (M') is free per se of spectral components and, in the case of which, the test signal (M'), after a self-convolution, exhibits additional spectral components (SA1 . . . SA10). The additional spectral components (SA1 . . . SA10) occurring at the evaluation frequencies (AW 1 . . . AW 10) allow a non-linearity of the transmission path (4) to be immediately detected.

Abstract translation: PCT No.PCT / DE93 / 00109 Sec。 371日期1994年8月26日 102（e）日期1994年8月26日PCT提交1993年2月3日PCT公布。 公开号WO93 / 17348 日期1993年9月2日传输路径（4）馈送有从频域分布（S1 ... S10）的序列（m）生成的测试信号（M'），其在频域中等距分布 ，作为与附加功能（ZSF）组合的结果。 选择附加功能（ZSF），以便除了序列（m）的频谱分量（S1 ... S10）之外，允许测试信号（M'）包含附加频谱分量（ZS1 ... ZS21） 。 在测量信号（M'）本身是光谱分量的情况下，在评估频率（AW1 ... AW10）处评估在路径的输出侧接收的输出信号（M“）， 在这种情况下，在自卷积之后的测试信号（M'）表现出附加的光谱分量（SA1 ... SA10）。 在评估频率（AW 1 ... AW 10）处发生的附加频谱分量（SA1 ... SA10）允许立即检测传输路径（4）的非线性。

公开(公告)号：US5553059A

公开(公告)日：1996-09-03

申请号：US440297

申请日：1995-05-26

Applicant: Earl A. Emerson ,  Henry J. Gonzalez ,  Kyung-Yeop Hong

Inventor： Earl A. Emerson ,  Henry J. Gonzalez ,  Kyung-Yeop Hong

IPC: G06F11/00 ,  G06F11/14 ,  G06F11/22 ,  G06F13/38 ,  H04B17/40 ,  H04L1/24 ,  H04L12/26 ,  H04J3/14

CPC classification number: H04L1/247 ,  G06F11/1402 ,  G06F11/22 ,  G06F13/38 ,  H04B17/401 ,  H04L1/241 ,  H04L1/243 ,  H04L1/244 ,  H04L12/2697 ,  H04L43/50

Abstract: A system for isolating the direction of communication errors in the local loop of a digital data network is described. A Network Interface Unit (NIU) located at the customer premises typically has a loopback feature, allowing for Bit Error Rate Tests (BERT) to be performed on the local loop from a remote test system located on the data network. The NIU loopback test isolates transmission problems at the customer premises from problems on the local loop. The present invention adds test pattern generation capability to the NIU, allowing the remote test system to determine whether the transmission problem on the local loop is in the network to customer premises direction or in the customer premises to network direction.

Abstract translation: 描述了用于隔离数字数据网络的本地环路中的通信错误的方向的系统。 位于客户驻地的网络接口单元（NIU）通常具有环回功能，允许在位于数据网络上的远程测试系统的本地环路上执行误码率测试（BERT）。 NIU环回测试将客户端的传输问题与本地环路上的问题隔离开来。 本发明向NIU添加测试模式生成能力，允许远程测试系统确定本地环路上的传输问题是否在网络中到客户驻地方向或者在客户驻地到网络方向。

公开(公告)号：US4100531A

公开(公告)日：1978-07-11

申请号：US765167

申请日：1977-02-03

Applicant: James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Herbert S. Kobayashi ,  Joe Fowler ,  William Kurple

Inventor： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Herbert S. Kobayashi ,  Joe Fowler ,  William Kurple

IPC: H04L1/00 ,  G01R31/00 ,  H04L1/24 ,  G08C25/00

CPC classification number: H04L1/242 ,  H04L1/241

Abstract: Bit error rate is measured by sending a pseudo-random noise (PRN) code test signal simulating digital data through digital equipment to be tested. An incoming signal representing the response of the equipment being tested, together with any added noise, is received and tracked by being compared with a locally generated PRN code. Once the locally generated PRN code matches the incoming signal a tracking lock is obtained. The incoming signal is then integrated and compared bit-by-bit against the locally generated PRN code and differences between bits being compared are counted as bit errors.

Abstract translation: 通过发送通过要测试的数字设备模拟数字数据的伪随机噪声（PRN）码测试信号来测量误码率。 通过与本地生成的PRN码进行比较，接收并跟踪表示所测试设备的响应的输入信号以及任何附加的噪声。 一旦本地生成的PRN码与输入信号匹配，则获得跟踪锁定。 然后将输入信号整合并逐比地与本地生成的PRN码进行比较，并且将被比较的比特之间的差异计入比特误差。

公开(公告)号：US4097697A

公开(公告)日：1978-06-27

申请号：US802376

申请日：1977-06-02

Applicant: Stephen George Harman

Inventor： Stephen George Harman

IPC: H04L1/24 ,  H04B3/46

CPC classification number: H04L1/241

Abstract: A performance monitor for determining the error density of a digitally transmitted signal in which the magnitude of a d-c offset voltage applied to one regenerator is controlled in a feedback loop so as to maintain a constant error rate between the output of it and another regenerator; the magnitude of the voltage being a measure of the degradation of the received signal and hence its error density.

Abstract translation: 用于确定数字发送信号的误差密度的性能监视器，其中施加到一个再生器的d-c偏移电压的幅度被控制在反馈回路中，以便在其输出与另一再生器之间保持恒定的误差率; 电压的幅度是接收信号的劣化的量度，因此是其误差密度。

公开(公告)号：TW201427298A

公开(公告)日：2014-07-01

申请号：TW102146345

申请日：2013-12-16

Applicant: 萊特波因特公司 ,  LITEPOINT CORPORATION

Inventor： 奧萊傑 克里斯敦 沃夫 ,  OLGAARD, CHRISTIAN VOLF ,  王如珠 ,  WANG, RUIZU ,  爾督岡 爾登 瑟肯 ,  ERDOGAN, ERDEM SERKAN ,  菲利浦 馬修 ,  PHILIP, MATHEW

IPC: H04B1/38 ,  H04B17/00

CPC classification number: H04W24/00 ,  H04L1/1867 ,  H04L1/241 ,  H04L43/50 ,  H04W24/06

Abstract: 用於幫助測試多個資料封包信號收發器的系統及方法包含資料封包信號複製及一或多個狀態信號，該狀態信號指示確認信號之成功及不成功的接收。基於該一或多個狀態信號，一或多個控制信號導致該複製資料封包信號分配至受測裝置(DUT)，以致在確認信號之成功及不成功的接收之後，致使對應的複製資料封包信號分別為有部分無法成功地與一預定資料封包信號標準相一致或有部分與該預定資料封包信號標準相一致。

Abstract in simplified Chinese: 用于帮助测试多个数据封包信号收发器的系统及方法包含数据封包信号复制及一或多个状态信号，该状态信号指示确认信号之成功及不成功的接收。基于该一或多个状态信号，一或多个控制信号导致该复制数据封包信号分配至受测设备(DUT)，以致在确认信号之成功及不成功的接收之后，致使对应的复制数据封包信号分别为有部分无法成功地与一预定数据封包信号标准相一致或有部分与该预定数据封包信号标准相一致。