公开(公告)号：DE69933869T2

公开(公告)日：2007-06-21

申请号：DE69933869

申请日：1999-06-14

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY A

IPC: H04B1/7073 ,  G01S1/00 ,  H04B1/707 ,  H04B7/216 ,  H04L27/00 ,  H04Q7/38

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.

公开(公告)号：DE69933869D1

公开(公告)日：2006-12-14

申请号：DE69933869

申请日：1999-06-14

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY A

IPC: H04B1/7073 ,  G01S1/00 ,  H04B1/707 ,  H04B7/216 ,  H04L27/00 ,  H04Q7/38

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.