Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-06-20
2006-06-20
Corrielus, Jean B. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S152000
Reexamination Certificate
active
07065130
ABSTRACT:
A method and system enables matched filters of a CDMA system to be simplified using a two stage search. A course stage and a fine stage jointly produce the location(s) of received signal path-rays. In a first stage, an oversampled digital signal is decimated, and the decimated signal is applied to a matched filter to eventually produce an approximate location. In a second stage, the oversampled signal is shifted based on the determined approximate location and then correlated to a generated code, and a more-exact location is selected from the outputs of the correlations. Alternatively, a shifted version of the generated code is correlated to the oversampled signal, and the more-exact location is selected from the outputs of those correlations.
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Atarius Roozbeh
Carlsson Torsten
Eriksson Håkan
Gustafsson Kjell
Östberg Christer
Corrielus Jean B.
Telefonaktiebolaget LM Ericsson (publ)
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