Invention Grant
US07974364B2 Doppler frequency estimation and adaptation for mobile multimedia multicast systems 有权
用于移动多媒体多播系统的多普勒频率估计和适应

  • Patent Title: Doppler frequency estimation and adaptation for mobile multimedia multicast systems
  • Patent Title (中): 用于移动多媒体多播系统的多普勒频率估计和适应
  • Application No.: US12110688
    Application Date: 2008-04-28
  • Publication No.: US07974364B2
    Publication Date: 2011-07-05
  • Inventor: Nabil Yousef
  • Applicant: Nabil Yousef
  • Applicant Address: US CA Lake Forest
  • Assignee: Newport Media, Inc.
  • Current Assignee: Newport Media, Inc.
  • Current Assignee Address: US CA Lake Forest
  • Agency: Rahman LLC
  • Main IPC: H04L27/00
  • IPC: H04L27/00
Doppler frequency estimation and adaptation for mobile multimedia multicast systems
Abstract:
A technique for Doppler frequency estimation and adaptation in a MediaFLO™ (Forward Link Only) receiver system includes receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver, dividing a Doppler frequency range into N ranges corresponding to N interpolation filters; determining a correlation between two OFDM symbols separated by time; estimating a Doppler frequency by the correlation of OFDM symbols; determining a ratio of the correlation of OFDM symbols; comparing the determined ratio of the correlation of OFDM symbols with a look up table of α stored at a receiver to determine a corresponding Doppler frequency; mapping α ranges stored at the look up table to suitable interpolation filters; estimating an interpolation filter from the mapped α ranges mapped against determined α ratio; adapting Time Domain Interpolation (TDI) to the selected interpolation filter; and synchronizing receiver to the TDI filter.
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