Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-06-14
2005-06-14
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S146000
Reexamination Certificate
active
06907060
ABSTRACT:
In this invention, a new tree-structured generation method for obtaining orthogonal variable spreading factor (OVSF) codes that preserve orthogonality between different rates and spreading factors (SF) based on Gray code labels in a CDMA system is presented. Each OVSF code is uniquely associated with a Gray code label. An efficient method for deciding if the code is a mother code or children code of the other code without searching an entire code tree is proposed. Furthermore, by taking advantage of the Gray code labeling, each OVSF code can be generated directly from a generating matrix instead of being generated recursively using a tree structure. An OVSF code reassignment method with Gray code labeling is also given.
REFERENCES:
patent: 5751761 (1998-05-01), Gilhousen
Dinan, E., Jabbari, B.; Spreading Codes for Direct Sequence CDMA and wideband CDMA Cellular Networks; Sep. 1998; IEEE Communications Magazine; vol. 36, No. 9; pp. 48-54.
Accton Technology Corporation
Chin Stephen
Pathak Sudhanshu C.
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