公开(公告)号：US06522699B1

公开(公告)日：2003-02-18

申请号：US09100010

申请日：1998-06-19

Applicant: Carl William Anderson ,  Guy M. A. F. Duxbury

Inventor： Carl William Anderson ,  Guy M. A. F. Duxbury

IPC: H04L2704

CPC classification number: H04B3/30 ,  H04L25/03057 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/0349

Abstract: The invention is a novel method and transmission system for mitigating the adverse effects of amateur (HAM) radio interference on digital signals transmitted across a twisted pair and reducing the interference caused by the digital signals to amateur radio communications. At the heart of the invention is strategical placement of the frequency spectrum of the transmitted signal relative to the center frequency of the HAM bands. In particular, the signal spectrum is permitted to straddle one or more HAM bands, which permits the transport of high data rates with a single carrier. At the transmitter, the signal is filtered with a real-valued symmetric baseband filter in order to remove signal content in the HAM bands. At the receiver, the signal undergoes adaptive interference cancellation, followed by processing through a decision feedback equalizer. In some cases, the signal is filtered at baseband with a real-valued filter to remove interference in the HAM bands. In the context of a telecommunications access system, the inventive technique can be applied to either or both directions of traffic flow, i.e., downstream and upstream, and multiple carriers can be added to increase capacity in any given direction.

公开(公告)号：US06289063B1

公开(公告)日：2001-09-11

申请号：US09146341

申请日：1998-09-02

Applicant: Guy M. A. F. Duxbury

Inventor： Guy M. A. F. Duxbury

IPC: H04B110

CPC classification number: H04L27/3809 ,  H04L25/03057

Abstract: The invention discloses a novel equalization system for reducing the deleterious effects of crosstalk on signals received at a modem, with particular regard to QAM signals transmitted over copper twisted pairs. The equalization system employs the common combination of a linear equalizer followed by a decision-feedback equalizer (DFE). However, instead of aiming for perfect equalization of channel distortion, the overall frequency response of the channel plus the linear equalizer is skewed such that higher frequencies are attenuated relative to lower ones. More generally, the spectral regions where crosstalk is strongest are attenuated, which reduces the crosstalk noise present at the input to the DFE at the expense of introducing inter-symbol interference (ISI). Fortunately, most DFEs are capable of handling the added ISI, leading to data decisions that are relatively unaffected by crosstalk noise.

Abstract translation: 本发明公开了一种用于减少串扰对调制解调器接收的信号的有害影响的新型均衡系统，特别涉及通过铜双绞线传输的QAM信号。 均衡系统采用线性均衡器，然后是判决反馈均衡器（DFE）的公共组合。 然而，不是瞄准完美的信道失真均衡，而是通道加上线性均衡器的总体频率响应是偏斜的，使得较高的频率相对较低的频率衰减。 更一般地，串扰最强的频谱区域被衰减，这降低了引入符号间干扰（ISI）的DFE输入处存在的串扰噪声。 幸运的是，大多数DFE都能够处理增加的ISI，导致相对不受串扰噪声影响的数据决策。

公开(公告)号：US07069646B2

公开(公告)日：2006-07-04

申请号：US10407460

申请日：2003-04-07

Applicant: Guy M. A. F. Duxbury ,  Aneta Wyrzykowska ,  Luigi G. Difilippo ,  Herman Kwong

Inventor： Guy M. A. F. Duxbury ,  Aneta Wyrzykowska ,  Luigi G. Difilippo ,  Herman Kwong

IPC: H05K3/36

CPC classification number: H05K1/115 ,  H05K1/0298 ,  H05K1/112 ,  H05K3/0005 ,  H05K3/429 ,  H05K3/4602 ,  H05K2201/09227 ,  H05K2201/09236 ,  H05K2201/09263 ,  H05K2201/09509 ,  H05K2201/09536 ,  H05K2201/09627 ,  H05K2201/10734 ,  Y10T29/49016 ,  Y10T29/49117 ,  Y10T29/49126 ,  Y10T29/49155 ,  Y10T29/49165

Abstract: Techniques for reducing the number of layers in a multilayer signal routing device are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method wherein the multilayer signal routing device has a plurality of electrically conductive signal path layers for routing a plurality of electrical signals thereon. The method may comprise forming a plurality of electrically conductive vias in the multilayer signal routing device for electrically connecting at least two of the plurality of electrically conductive signal path layers, wherein the plurality of vias are arranged so as to form at least one channel in at least one other of the plurality of electrically conductive signal path layers. The method may also comprise grouping at least a portion of the plurality of electrical signals based at least in part upon their proximity to the at least one channel so that they may be efficiently routed therein.

Abstract translation: 公开了用于减少多层信号路由设备中的层数的技术。 在一个特定的示例性实施例中，这些技术可以被实现为一种方法，其中多层信号路由设备具有用于在其上路由多个电信号的多个导电信号路径层。 所述方法可以包括在所述多层信号路由设备中形成多个导电通孔，用于电连接所述多个导电信号路径层中的至少两个，其中所述多个通孔被布置成在其中形成至少一个通道 多个导电信号路径层中的至少另一个。 该方法还可以包括至少部分地基于它们与至少一个信道的接近度来分组多个电信号的至少一部分，使得它们可以被有效地路由到其中。

公开(公告)号：US06460154B1

公开(公告)日：2002-10-01

申请号：US09200436

申请日：1998-11-27

Applicant: Guy M. A. F. Duxbury

Inventor： Guy M. A. F. Duxbury

IPC: H03M1300

CPC classification number: H04L1/1848 ,  H03M13/00 ,  H04L1/1812

Abstract: The invention is a modem and associated method of data transmission which improve the protection afforded to data under conditions of occasional impulsive noise. The modem is ideally suited for use with another modem of similar type in a system whereby data is transmitted as a sequence of frames in either direction. Each modem applies forward error correction (FEC) to frames transmitted to the other modem. If a particular frame is corrupted on its way from a “first” modem to a “second” modem, the second modem attempts to correct these errors. If it is unable to do so, then the second modem will request a retransmission by placing a binary encoded message in the error field of a frame transmitted towards the first modem. The binary encoded message is itself protected from errors by a suitable combination of zeroes and ones. The second modem then sets a timer and subsequently ignores all frames received from the first modem until the timer expires. Meanwhile, the first modem continuously verifies the error field in each frame received from the second modem and if it identifies the request for retransmission, it sends back all the frames transmitted between the present time and a time in the past corresponding to the expiry time of the timer in the second modem. In an exactly analogous way, the first modem can request retransmission of frames from the second modem.

Abstract translation: 本发明是一种调制解调器和相关联的数据传输方法，其在偶然的脉冲噪声的条件下提高了对数据的保护。 调制解调器非常适合与系统中类似类型的另一个调制解调器一起使用，其中数据作为任一方向上的帧序列传输。 每个调制解调器向发送到另一个调制解调器的帧应用前向纠错（FEC）。 如果特定帧在从“第一”调制解调器到“第二”调制解调器的路上损坏，则第二个调制解调器尝试纠正这些错误。 如果不能这样做，则第二调制解调器将通过将二进制编码的消息放置在向第一调制解调器发送的帧的错误字段中来请求重传。 二进制编码的消息本身通过零和一个适当的组合来保护免受错误的影响。 然后第二个调制解调器设置一个定时器，随后忽略从第一个调制解调器接收到的所有帧，直到定时器到期。 同时，第一调制解调器连续地验证从第二调制解调器接收的每帧中的错误字段，并且如果它识别出重传请求，则将当前时间和过去的时间之间发送的所有帧相应于对应于 第二个调制解调器中的定时器。 以完全相似的方式，第一调制解调器可以请求从第二调制解调器重发帧。