公开(公告)号：US20130107922A1

公开(公告)日：2013-05-02

申请号：US13710268

申请日：2012-12-10

Applicant: INTERSIL AMERICAS INC.

Inventor： Greg Tomezak ,  Mark Fimoff

IPC: H04L27/01

CPC classification number: H04L27/01 ,  H04L25/022 ,  H04L25/03159 ,  H04L27/34 ,  H04N21/42607

Abstract: Systems and methods for determining an unknown QPSK or QAM constellation from a set of possible received constellations are described. One method utilizes a histogram of the power of the signal after inter-symbol-interference has been minimized with a modified constant modulus algorithm equalizer. The constellation may be determined before carrier frequency and phase has been fully recovered. An unknown QPSK or QAM constellation may be identified before or after equalization using disclosed methods for analyzing an output power histogram.

Abstract translation: 描述了从一组可能的接收星座中确定未知QPSK或QAM星座的系统和方法。 一种方法利用改进的恒模算法均衡器使符号间干扰已被最小化之后的信号功率的直方图。 可以在载波频率和相位完全恢复之前确定星座。 可以使用公开的用于分析输出功率直方图的方法在均衡之前或之后识别未知QPSK或QAM星座。

公开(公告)号：US09001911B2

公开(公告)日：2015-04-07

申请号：US13706290

申请日：2012-12-05

Applicant: Intersil Americas Inc.

Inventor： Mark Fimoff ,  Greg Tomezak

IPC: H04L23/02 ,  H04L27/34 ,  H04L5/00 ,  H04L27/26 ,  H04L1/00

CPC classification number: H04L27/36 ,  H04L1/0045 ,  H04L1/0054 ,  H04L1/0057 ,  H04L1/0071 ,  H04L5/0007 ,  H04L5/003 ,  H04L5/0046 ,  H04L5/16 ,  H04L27/2608 ,  H04L27/2647 ,  H04L27/2655 ,  H04L27/34

Abstract: A DMT system for a half-duplex two-way link carries Internet protocol encoded video stream on a coaxial cable that also carries a baseband rendition of the same video stream. A plurality of downlink symbols modulated on a subband of subcarriers in a downlink signal are decoded. The symbols may carry data encoded on a subband using a constellation of QAM symbols assigned to the subband. Other subbands may be associated with different QAM constellations. Lower-order constellations of QAM symbols may be assigned to subbands that include higher-frequency subcarriers and higher-order constellations of QAM symbols may be assigned to subbands that include lower-frequency subcarriers. A block error correction decoder may be synchronized based on an identification of the first constellation of QAM symbols and information identifying boundaries between the plurality of downlink symbols.

Abstract translation: 用于半双工双向链路的DMT系统在同轴电缆上承载互联网协议编码的视频流，该同轴电缆还携带相同视频流的基带再现。 解码在下行链路信号中的子载波的子带上调制的多个下行链路符号。 符号可以使用分配给子带的QAM符号的星座携带在子带上编码的数据。 其他子带可能与不同的QAM星座相关联。 可以将QAM符号的低阶星座分配给包括较高频率子载波的子带，并且可以将QAM符号的高阶星座分配给包括较低频率子载波的子带。 可以基于QAM符号的第一星座的标识和识别多个下行链路符号之间的边界的信息来同步块纠错解码器。