发明授权
- 专利标题: Phase detectors in carrier recovery for offset QAM and VSB
- 专利标题(中): 载波恢复中的相位检测器用于偏移QAM和VSB
-
申请号: US10687172申请日: 2003-10-16
-
公开(公告)号: US07327819B2公开(公告)日: 2008-02-05
- 发明人: Thuji S. Lin , Tian-Min Liu , Stephen E. Krafft
- 申请人: Thuji S. Lin , Tian-Min Liu , Stephen E. Krafft
- 申请人地址: US CA Irvine
- 专利权人: Broadcom Corporation
- 当前专利权人: Broadcom Corporation
- 当前专利权人地址: US CA Irvine
- 代理机构: Sterne, Kessler, Goldstein & Fox PLLC
- 主分类号: H03D3/24
- IPC分类号: H03D3/24
摘要:
A carrier recovery, symbol timing, and carrier phase tracking systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system. 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 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.
公开/授权文献
信息查询
IPC分类: