Title:
ドップラーシフトした信号の周波数不確定範囲を絞り込むシステム及び方法
Document Type and Number:
Japanese Patent JP4194759
Kind Code:
B2
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.
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Inventors:
Harms, Brian
Gregory, Sherman A
Butler, Brian Kay
Agrawal, Abniesh
Gregory, Sherman A
Butler, Brian Kay
Agrawal, Abniesh
Application Number:
JP2000555373A
Publication Date:
December 10, 2008
Filing Date:
June 14, 1999
Export Citation:
Assignee:
QUALCOMM INCORPORATED
International Classes:
H04B1/7073; G01S1/00; H04B1/707; H04B7/216; H04L27/00
Domestic Patent References:
| JP9223980A | ||||
| JP10051355A | ||||
| JP5432521B2 |
Foreign References:
| WO1999025079A1 | ||||
| WO1999055033A1 |
Attorney, Agent or Firm:
Takehiko Suzue
Sadao Muramatsu
Ryo Hashimoto
Toshio Shirane
Sadao Muramatsu
Ryo Hashimoto
Toshio Shirane