首页> 外国专利> QAM/VSB TWO-METHOD RECEIPTS

QAM/VSB TWO-METHOD RECEIPTS

机译:QAM / VSB两式收据

摘要

Improved carrier recovery and symbol timing systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system is disclosed. Carrier and symbol timing acquisition and tracking loops are phase/frequency locked to an inserted pilot signal provided in an input VSB spectrum at a given frequency. An input spectrum is centered about baseband and the pilot is extracted by an equivalent filter which functions as a bandpass filter having pass bands centered about the pilot frequency. Since the pilot signal's frequency is given, its position in the frequency domain for any sampling frequency, is deterministic. The receiver's sampling frequency is provided such that the relationship is expressed as fc=fs/4. When tracked by a phase-lock loop, the pilot signal will appear at the correct location in the spectrum if the sampling frequency fs is correct, and will be shifted in one direction or the other if the sampling frequency fs is too high or too low.
机译:公开了适合与双模式QAM / VSB接收机系统结合使用的改进的载波恢复和符号定时系统和方法。载波和符号定时获取和跟踪环路被相位/频率锁定到以给定频率在输入VSB频谱中提供的插入导频信号。输入频谱以基带为中心,并且通过等效滤波器提取导频,该等效滤波器用作具有以导频为中心的通带的带通滤波器。由于给定了导频信号的频率,因此对于任何采样频率,其在频域中的位置都是确定的。提供接收机的采样频率,使得该关系表示为fc = fs / 4。当通过锁相环跟踪时,如果采样频率fs正确,则导频信号将出现在频谱中的正确位置;如果采样频率fs太高或太低,则导频信号将在一个方向或另一个方向上移动。 。

著录项

  • 公开/公告号DE69920737D1

    专利类型

  • 公开/公告日2004-11-04

    原文格式PDF

  • 申请/专利权人 BROADCOM CORP. IRVINE;

    申请/专利号DE19996020737T

  • 发明设计人 JAFFE T.;LIU TIAN-MIN;TAN KUN;

    申请日1999-11-03

  • 分类号H04L7/00;H04L27/227;H04L25/03;H04N5/46;

  • 国家 DE

  • 入库时间 2022-08-21 22:39:52

相似文献

  • 专利
  • 外文文献
  • 中文文献
获取专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号