公开(公告)号：US20010055319A1

公开(公告)日：2001-12-27

申请号：US09780179

申请日：2001-02-09

Applicant: Broadcom Corporation

Inventor： Thomas J. Quigley ,  Jonathan S. Min ,  Lisa V. Denney ,  Henry Samueli ,  Sean F. Nazareth ,  Feng Chen ,  Fang Lu ,  Christopher R. Jones

IPC: H04N007/173 ,  H04J001/00

CPC classification number: H04L25/03343 ,  H04B1/1036 ,  H04J3/0664 ,  H04J3/0682 ,  H04J3/1694 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0061 ,  H04L1/203 ,  H04L7/0004 ,  H04L7/0029 ,  H04L7/033 ,  H04L12/2801 ,  H04L49/90 ,  H04L49/9094 ,  H04L2025/03808 ,  Y02D50/10

Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.

Abstract translation: 用于增强电缆传输系统的性能的许多特征，其中数据在前端的电缆调制解调器终端系统与位于与头端不同距离的多个电缆调制解调器之间传输。 电缆调制解调器的功率传输电平，时隙定时和均衡由测距过程设置。 调制解调器以分段形式传输数据。 采取各种措施使电缆调制解调器的传输稳健。 控制上游数据传输以允许来自电缆调制解调器的多次访问。

公开(公告)号：US20040163120A1

公开(公告)日：2004-08-19

申请号：US10780362

申请日：2004-02-17

Applicant: Broadcom Corporation

Inventor： Theodore F. Rabenko ,  James C. H. Thi ,  John D. Horton JR. ,  Thomas J. Quigley ,  Lisa V. Denney ,  Jonathan S. Min ,  Christopher R. Jones ,  Henry Samueli ,  Fang Lu ,  Feng Chen ,  Sean F. Nazareth

IPC: H04N007/173 ,  H04L012/50 ,  H04Q011/00 ,  H04L012/66 ,  G01R031/08 ,  G08C015/00 ,  H04L012/26 ,  G06F011/00 ,  H04J003/14 ,  H04J001/16 ,  H04L001/00

CPC classification number: H04L12/2801 ,  H04J3/0655 ,  H04L1/0003

Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.