Method for generating 2D OVSF codes in multicarrier DS-CDMA...

Details Method for generating 2D OVSF codes in multicarrier DS-CDMA... Method for generating 2D OVSF codes in multicarrier DS-CDMA...

2008-03-18

2008-03-18

Milord, Marceau (Department: 2618)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S208000, C370S209000, C370S342000, C370S441000, C375S130000, C375S140000, C375S148000

Reexamination Certificate

active

10406359

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 M1×N12D-OVSF matrices, in the form of A(i)(M1×N1)for i={1, 2, . . . , K1} is selected as seed matrices. M1represents the number of available frequency carriers in the MC-DS/CDMA system, and N1represents a spreading factor code length. Another set of existing M2×N22D-OVSF matrices, in the form of B2(i)(M2×N2)for i={1, 2, . . . , K2} is then selected as mapping matrices. The mapping matrices are used to generate corresponding children matrices. These second layer child matrices are M1M2×N1N2matrices with cardinality K1K2, which are defined by reiterating the relationship:C(M1⁢M2×N1⁢N2)((i-1)⁢K2+1)=B2⁢(M2×N2)(1)⊕A(M1×N1)(i)C(M1⁢M2×N1⁢N2)((i-1)⁢K2+2)=B2⁢(M2×N2)(2)⊕A(M1×N1)(i)⁢⋯C(M1⁢M2×N1⁢N2)((i-1)⁢K2+K2)=B2⁢(M2×N2)(K2)⊕A(M1×N1)(i)where ⊕ indicates a Kronecker product, and i=1, 2, 3, 4, . . . , K1.

REFERENCES:
patent: 6009091 (1999-12-01), Stewart et al.
patent: 6091757 (2000-07-01), Cudak et al.
patent: 6130884 (2000-10-01), Sato
patent: 6233231 (2001-05-01), Felix et al.
patent: 6680902 (2004-01-01), Hudson
patent: 6707841 (2004-03-01), Takasaki
patent: 6747947 (2004-06-01), Kim et al.
patent: 6885653 (2005-04-01), Choi et al.
patent: 6885691 (2005-04-01), Lyu
patent: 6907060 (2005-06-01), Yang
patent: 6956890 (2005-10-01), Lattuca et al.
patent: 6975615 (2005-12-01), Toskala et al.
patent: 7054294 (2006-05-01), Magnusson
patent: 7123579 (2006-10-01), Lyu
patent: 2002/0006156 (2002-01-01), Relaiche
patent: 2002/0102981 (2002-08-01), Jechoux
patent: 2003/0058788 (2003-03-01), Kim et al.

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