Invention Grant
- Patent Title: System and method for doppler frequency estimation
- Patent Title (中): 多普勒频率估计的系统和方法
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Application No.: US12277247Application Date: 2008-11-24
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Publication No.: US08149905B1Publication Date: 2012-04-03
- Inventor: Hao-Ren Cheng , Gaspar Lee , Chih-Yuan Chu
- Applicant: Hao-Ren Cheng , Gaspar Lee , Chih-Yuan Chu
- Applicant Address: US CA San Jose
- Assignee: Qualcomm Atheros, Inc.
- Current Assignee: Qualcomm Atheros, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Bever, Hoffman & Harms, LLP
- Main IPC: H04B3/46
- IPC: H04B3/46 ; H04B17/00 ; H04Q1/20

Abstract:
A method and apparatus in a multiple sub-carrier digital communication receiver estimates a Doppler frequency bandwidth. The Doppler frequency bandwidth is estimated by comparing a first set of channel estimates to a second set of channel estimates generated by Wiener filter interpolation of the first set of channel estimates. The Wiener interpolation filter coefficients are generated for various Doppler frequency bandwidths. Pre-determined transmit pilot symbols may be used to generate the first set of channel estimates in an OFDM communication system. A set of Wiener filter interpolation errors may be generated at one or more sub-carrier frequencies, for each of the different Doppler frequency bandwidths, and averaged across time and/or frequency. The Doppler frequency estimation method and apparatus may select a Doppler frequency estimate based on the set of Wiener filter interpolation errors.
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