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1. 发明申请

US20040081257A1 Phase detectors in carrier recovery for offset QAM and VSB 有权
标题翻译：载波恢复中的相位检测器用于偏移QAM和VSB
公开(公告)号：US20040081257A1
公开(公告)日：2004-04-29
申请号：US10687172
申请日：2003-10-16
申请人： Broadcom Corporation
发明人： Thuji S. Lin , Tian-Min Liu , Stephen E. Krafft
IPC分类号： H03D001/24 , H04B001/10
CPC分类号： H04N5/21 , H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/455 , H04N5/46 , H04N11/002
摘要： Improved carrier recovery, symbol timing, and carrier phase tracking systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system are disclosed. Carrier and phase recovery systems operate on complex signals representing symbols having the same time stamp for each phase error term. in-phase signals are sampled twice a symbol at the in-phase symbol sampling time and at the quadrature-phase symbol sampling time. The signals are de-multiplexed to generate I and XI data streams, where I represents the in-phase sampling time signals and XI represents mid-symbol point sample times. A similar procedure is carrier out on quadrature-phase signals. When the in-phase signal is de-multiplexed to generate a symbol I, the quadrature-phase signal is de-multiplexed to generate its mid-symbol point XQ. Both I and Q are decoded in a decision device to define a symbol error term, which is combined with the opposite mid-symbol signal to define a phase error term PI and PQ for each rail. In both cases, the symbol (I) decision (null), and mid-symbol (XQ) in each phase error term (PI) computation will have the same prime index.
摘要翻译：公开了改进的载波恢复，符号定时以及适用于双模QAM / VSB接收机系统的载波相位跟踪系统和方法。载波和相位恢复系统对表示每个相位误差项具有相同时间戳的符号的复数信号进行操作。在同相符号采样时间和正交相位符号采样时间，将同相信号采样两次符号。信号被去多路复用以产生I和XI数据流，其中I表示同相采样时间信号，XI表示中间符号点采样时间。类似的过程是正交相位信号的载波。当同相信号被去多路复用以产生符号I时，正交相位信号被去多路复用以产生其中间符号点XQ。在决策装置中对I和Q两者进行解码，以定义符号误差项，该符号误差项与相反的中间码元信号组合，以定义每个轨道的相位误差项PI和PQ。在这两种情况下，每个相位误差项（PI）计算中的符号（I）决策（Î）和中间符号（XQ）将具有相同的素数指数。

2. 发明申请

US20030058967A1 Phase detectors in carrier recovery for offset QAM and VSB 有权
公开(公告)号：US20030058967A1
公开(公告)日：2003-03-27
申请号：US10288833
申请日：2002-11-06
申请人： Broadcom Corporation
发明人： Thuji S. Lin , Tian-Min Liu , Stephen E. Krafft
IPC分类号： H04L005/12 , H04L023/02 , H04L025/00 , H04L007/00 , H03D003/24 , H03D003/18
CPC分类号： H04N5/21 , H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/455 , H04N5/46 , H04N11/002
摘要： Improved carrier recovery, symbol timing, and carrier phase tracking systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system are disclosed. Carrier and phase recovery systems operate on complex signals representing symbols having the same time stamp for each phase error term. in-phase signals are sampled twice a symbol at the in-phase symbol sampling time and at the quadrature-phase symbol sampling time. The signals are de-multiplexed to generate I and XI data streams, where I represents the in-phase sampling time signals and XI represents mid-symbol point sample times. A similar procedure is carrier out on quadrature-phase signals. When the in-phase signal is de-multiplexed to generate a symbol I, the quadrature-phase signal is de-multiplexed to generate its mid-symbol point XQ. Both I and Q are decoded in a decision device to define a symbol error term, which is combined with the opposite mid-symbol signal to define a phase error term PI and PQ for each rail. In both cases, the symbol (I) decision (null), and mid-symbol (XQ) in each phase error term (PI) computation will have the same prime index.

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