Title:
METHOD FOR ASSIGNING VARIABLE-LENGTH WALSH CODES FOR CODE DIVISION MULTIPLE ACCESS COMMUNICATIONS SYSTEMS
Document Type and Number:
WIPO Patent Application WO2003049226
Kind Code:
A9
Abstract:
Modulation codes for code division multiple access (CDMA) cellular communications systems that are mutually orthogonal may be generated as a sequence of Walsh codes. A method of assigning Walsh codes includes the steps of (404) receiving as input a status vector (200) for a Walsh code system of length 2n and a selected Walsh code length j = 2n-k; (406) - (418) creating a new status vector for a selected Walsh code length of j from the status vector; (416) creating a search mask for the selected Walsh code length j; (418) creating a search sequence for the selected Walsh code length j; and (434) - (442) searching the search sequence for the next available Walsh code. The status vector is updated (500) to track the assignment and release of each Walsh code of each Walsh code length in the Walsh code system.
Inventors:
THORSON DEAN E
DECLERK DANIEL J
DECLERK DANIEL J
Application Number:
PCT/US2002/037285
Publication Date:
October 30, 2003
Filing Date:
November 21, 2002
Export Citation:
Assignee:
MOTOROLA INC (US)
International Classes:
H04J13/16; H04J11/00; (IPC1-7): H04J11/00
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