Data scrambling system and method and communications system incorporating same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jun 29, 1999
Grant Date -
N/A
app pub date -
Jun 11, 1997
filing date -
Jun 11, 1997
priority date (Note) -
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Abstract
Users or subscribers of a multi-user communications system, such as a spread spectrum communications system, provide signals to the central station or base unit of that system, and receive signals therefrom. Avoidance of interference among those users' signals is needed to ensure proper operation of the system. To do so, the data of each user is individually scrambled to randomize the data that different users are transmitting, in order to improve tracking performance at a receiver. The data of each user is scrambled independently, in a manner unique to that user in the system, in order to improve tracking performance and detection performance of a receiver. This scrambling makes the multi-user interference zero mean, and makes it possible to integrate out or average out the multi-user interference. The pattern or sequence used for this scrambling, and the pattern or sequence used for spreading here, are preferably identical except in frequency.
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