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：US20040210812A1

公开(公告)日：2004-10-21

申请号：US10843655

申请日：2004-05-11

Applicant: BROADCOM CORPORATION

Inventor： Kelly B. Cameron ,  Ba-Zhong Shen ,  Hau Thien Tran ,  Christopher R. Jones ,  Thomas Ashford Hughes JR.

IPC: G06F011/00 ,  H04L001/00 ,  G06F011/30 ,  H03M013/00 ,  G08C025/00

CPC classification number: H03M13/3972 ,  H03M13/151 ,  H03M13/1515 ,  H03M13/25 ,  H03M13/258 ,  H03M13/27 ,  H03M13/2757 ,  H03M13/29 ,  H03M13/2966 ,  H03M13/2978 ,  H03M13/3905 ,  H03M13/3922 ,  H03M13/3927 ,  H03M13/3988 ,  H03M13/4107 ,  H03M13/6505 ,  H03M13/6561 ,  H04L1/0041 ,  H04L1/005 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071

Abstract: A method for parallel concatenated (Turbo) encoding and decoding. Turbo encoders receive a sequence of input data tuples and encode them. The input sequence may correspond to a sequence of an original data source, or to an already coded data sequence such as provided by a Reed-Soloman encoder. A turbo encoder generally comprises two or more encoders separated by one or more interleavers. The input data tuples may be interleaved using a modulo scheme in which the interleaving is according to some method (such as block or random interleaving) with the added stipulation that the input tuples may be interleaved only to interleaved positions having the same modulo-N (where N is an integer) as they have in the input data sequence. If all the input tuples are encoded by all encoders then output tuples can be chosen sequentially from the encoders and no tuples will be missed. If the input tuples comprise multiple bits, the bits may be interleaved independently to interleaved positions having the same modulo-N and the same bit position. This may improve the robustness of the code. A first encoder may have no interleaver or all encoders may have interleavers, whether the input tuple bits are interleaved independently or not. Modulo type interleaving also allows decoding in parallel.

Abstract translation: 一种并行级联（Turbo）编码和解码的方法。 Turbo编码器接收一系列输入数据元组并进行编码。 输入序列可以对应于原始数据源的序列，或者对应于已经编码的数据序列，例如由Reed-Soloman编码器提供的。 turbo编码器通常包括由一个或多个交织器分离的两个或更多个编码器。 输入数据元组可以使用其中交织根据某些方法（例如块或随机交织）的加法规则进行交织，其中输入元组可以只交织到具有相同模N的交织位置 其中N是整数），因为它们在输入数据序列中具有。 如果所有的输入元组都是由所有的编码器编码的，那么输出元组可以从编码器顺序选择，也不会丢失元组。 如果输入元组包含多个比特，那么这些比特可以与具有相同模N和相同比特位置的交织位置独立交织。 这可以提高代码的鲁棒性。 第一编码器可以不具有交织器，或者所有编码器可以具有交织器，无论输入元组位是否独立交错。 模式类型交织也允许并行解码。

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.