Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-07-12
2005-07-12
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S343000, C375S364000, C370S320000, C370S335000, C370S515000
Reexamination Certificate
active
06917644
ABSTRACT:
A spread spectrum receiver uses a comparison of the magnitude of the code correlation amplitudes at equal power at a one chip spacing to the magnitude at a central position there between to determine if multipath interference is present. The lead or lag error from constructive or destructive multipath interference may also be determined. Inaccuracies due to such interference may then be corrected or minimized by, for example, determining the residual code phase error and/or the prompt or accurate code phase delay.
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Cahn Charles R.
Chansarkar Mangesh
Kohli Sanjai
Ha Dac V.
Hallman Jon
MacPherson Kwok Chen & Heid
SiRF Technology Inc.
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