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...

2007-03-27

2007-03-27

Ferris, Derrick (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

Reexamination Certificate

active

10063771

ABSTRACT:
A code tree of two-dimensional orthogonal variable spreading factor (2D-OVSF) code matrices for a multicarrier direct-sequence code-division multiple-access (MC-DS/CDMA) communications system is generated by providing two sets of 2×2 orthogonal matrices {A(1)(2×2),A(2)(2×2)} and {B(1)(2×2),B(2)(2×2)}. The first set of 2×2 matrices is used to generate a pair of sibling nodes in the code tree that respectively represent matrices A(1)(2×2α)and A(2)(2×2α)by iterating the relationship:A(1)(2×21+β)=[A(1)(2×2β)A(2)(2×2β)], The matrices A(1)(2×2α)and A(2)(2×2α)areA(2)(2×21+β)=[A(1)(2×2β)−A(2)(2×2β)].used to generate a child node of one of the sibling nodes. The child node contains an M×N matrix, which is found by iterating the relationship:A(i−1)(O×P)=[B(1)(2×2){circle around (×)}A(i/2)(0/2×P/2)] where {circle around (×)} indicates a Kronecker product.A(i)(O×P)=[B(2)(2×2){circle around (×)}A(i/2)(0/2×P/2)],

REFERENCES:
patent: 6975615 (2005-12-01), Toskala et al.
patent: 2002/0006156 (2002-01-01), Belaiche
patent: 2002/0102981 (2002-08-01), Jechoux
patent: 2003/0058788 (2003-03-01), Kim et al.
Title: On the Capacity of a Cellular CDMA System (From: IEEE Transactions on Vehicular Technology, vol. 40, No. 2, May 1991) pp.: 302-312, Total 11 Pages. Author: Klein S. Gilhausen, Irwin M. Jacobs, Roberto Padovani, Andrew J. Viterbi, Lindsay A. Weaver,Jr., Charles E. Wheatley.
Title: Wideband DS-CDMA for Next-Generation Mobile Communications Systems (From: IEEE Communications Magazine, Sep. 1998) pp.: 56-69, Total 14 Pages. Author: Fumiyuki Adachi, Mamoru Sawahashi, Hirohito Suda.
Spreading Codes for Direct Sequence CDMA and Wideband CDMA Cellular Networks (From: IEEE Communications Magazine Sep. 1998) pp.: 48-50, Total 7 Pages. Author: Esmael H. Dinan and Bijan Jabbari.
Title: UMTS/IMT-2000 Based on Wideband CDMA (From: IEEE Communications Magazine Sep. 1998) pp.: 70-80, Total 11 Pages. Author: Erik Dahlman, Björn Gudmundson, Mats Nilsson, and Johan Sköld.
Title: Performance of Multicarrier DS CDMA Systems (From: IEEE Transactions on Communications, Vol. 44, No. 2, Feb. (1996) pp.: 238-246, Total 9 Pages. Author: Shira Kondo and Laurènce B. Mulstein.
Title: Performance of Orthogonal Multicarrier CDMA in a Multipath Fading Channel From: IEEE Transactions on Communications, vol. 44, No. 3, Mar. 1996 pp.: 356-367, Total 12 pages. Author: Essam A. Sourour, and Masao Nakagawa.
Asynchronous Multicarrier DS-CDMA Using Mutually Orthogonal Complementary Sets of Sequences. From: IEEE Transactions on Communications, vol. 48, No. 1, Jan. 2000 pp.: 53-59, Total 7 Pages. Author: Shu-Ming Tseng, and Mark R. Bell.
Title: A Multicarrier CDMA Architecture Based on Orthogonal Complementary Codes for New Generations of Wideband Wireless Communications. From: IEEE Communications Magazine. Oct. 2001 Author: Hstao-Hwa Chen, Jun-Feng Yeh, and Naoki Suehiro pp.: 126-135, Total 10 Pages.
Title: Complementary Sets of Sequences From: IEEE Transactions on Information Theory, vol. 11-18, No. 5, Sep. 1972. pp.: 644-652, Total 9 Pages. Author: C-C- Tseng, and C.L. Liu.
Title: N-Shift Cross-orthogonal Sequences From: IEEE Transactions on Information Theory, vol. 34, No.1, Jan. 1988. pp.: 143-146, Total 4 pages. Author: N. Suehiro, and M. Hatori.
Title: Tree-Structured Generation of Orthogonal Spreading Codes with Different Lengths for Forward Link of DS-CDMA Mobile radio From: Electronics letters Jan. 2, 1997 vol. 33 No. 1 pp.: 27-28, Total 2 pages. Author: F. Adachi, M. Sawahashi and K. Okawa.

Affiliated with

Also associated with

Rating

Method for generating 2D OVSF codes in multicarrier DS-CDMA... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for generating 2D OVSF codes in multicarrier DS-CDMA..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for generating 2D OVSF codes in multicarrier DS-CDMA... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3777088