The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 2008
Filed:
Apr. 04, 2003
Guu-chang Yang, Tai-Chung, TW;
Chia-ming Yang, Pan-Chiao, TW;
Pei-hsuan Lin, Ta-Li, TW;
Accton Technology Corporation, Hsin-Chu, TW;
Abstract
A multicarrier direct-sequence code-division multiple-access (MC-DS/CDMA) communications system is provided. A code tree of two-dimensional orthogonal variable spreading factor (2D-OVSF) codes is then generated for the system. To generate the code tree, a set of existing M×N2D-OVSF matrices, in the form of Afor i={1, 2, . . . , K} is selected as seed matrices. Mrepresents the number of available frequency carriers in the MC-DS/CDMA system, and Nrepresents a spreading factor code length. Another set of existing M×N2D-OVSF matrices, in the form of Bfor i={1, 2, . . . , K} is then selected as mapping matrices. The mapping matrices are used to generate corresponding children matrices. These second layer child matrices are MM×NNmatrices with cardinality KK, which are defined by reiterating the relationship: where ⊕ indicates a Kronecker product, and i=1, 2, 3, 4, . . . , K.