Method and apparatus for generating non-recursive variable...

Details Method and apparatus for generating non-recursive variable... Method and apparatus for generating non-recursive variable...

2008-03-31

2009-10-27

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C370S208000, C370S320000, C370S342000, C370S355000

Reexamination Certificate

active

07609749

ABSTRACT:
A method for constructing and selecting non-recursive orthogonal variable spreading factor (OVSF) codes is provided. The method includes: defining a variable B=SFmax/SFmin, where SFmaxis a maximum desired spreading factor and SFminis a minimum desired spreading factor; forming B unique base matrices Gkof dimension SFmin×SFmin, where GiGiT=SFminImin∀i, where T denotes a matrix transpose and Iminis an SFmin×SFminidentity matrix; forming a modulation matrix M of dimension B×B such that MMT=BIB, where IBis a B×B identity matrix; forming an SFmax×SFmaxorthogonal variable spread factor (OVSF) code matrix C′ as:C′=[M1,1·G1M1,2·G2…M1,B·GBM2,1·G1M2,2·G2…M2,B·GB⋮⋮⋰⋮MB,1·G1MB,2·G2…MB,B·GB],where Mi,jis a scalar from the i-th row and j-th column of the modulation matrix M, Gl. . . GBis the k-th base matrix Gkand Mi,j·Gkdenotes the multiplication of the elements of Gkby the scalar Mi,j; selecting a row of the OVSF code matrix C′ to use as a pseudo-noise (PN) code; and one of spreading or despreading a signal using the selected PN code.

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