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AssigneeMotorola, Inc.
InventorsRon Rotstein, Yuda Yehuda Luz, Robert John Corke
Estimating the term…
A current mode of operation is provided to a Walsh spreader (203), and based on the current mode of operation, the Walsh spreader (203) either varies a Walsh code at a symbol rate, or holds the Walsh code constant. During multi-carrier transmission a first symbol within a data stream (210) is spread with a first Walsh code, while symbols immediately preceding and following the first symbol are spread by a another, differing Walsh code. The sequence of Walsh codes exiting the spreader (201) is further scrambled by a pair of Pseudo-Noise (PN) codes (224) that are held constant for three Walsh code periods during multi-carrier transmission, and are not held constant during direct-spread transmission.
A method for despreading, data in a spread-spectrum communication system, the method comprising the steps of:
An apparatus for despreading data in a spread-spectrum communication system, the apparatus comprising a first despreader having a current mode of operation as an input and outputting despread data based on the current mode of operation, wherein the despread data is despread with a spreading code that is held constant for a plurality of symbols when operating in the first mode, otherwise despread with a third spreading code that varies at the symbol rate, a second despreader despreads data with a Walsh code that varies at a symbol rate when operating in a first mode of operation, otherwise despreads data with a non varying Walsh code.
Dependencies are inferred from the claim text.