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:
Oct. 27, 2009
Filed:
Mar. 31, 2008
Eric K. Hall, Salt Lake City, UT (US);
Thomas R. Giallorenzi, Sandy, UT (US);
Richard B. Ertel, Sandy, UT (US);
Eric K. Hall, Salt Lake City, UT (US);
Thomas R. Giallorenzi, Sandy, UT (US);
Richard B. Ertel, Sandy, UT (US);
L-3 Communications Corporation, New York, NY (US);
Abstract
A method for constructing and selecting non-recursive orthogonal variable spreading factor (OVSF) codes is provided. The method includes: defining a variable B=SF/SF, where SFis a maximum desired spreading factor and SFis a minimum desired spreading factor; forming B unique base matrices Gof dimension SF×SF, where GG=SFI∀i, where T denotes a matrix transpose and Iis an SF×SFidentity matrix; forming a modulation matrix M of dimension B×B such that MM=BI, where Iis a B×B identity matrix; forming an SF×SForthogonal variable spread factor (OVSF) code matrix C' as: where Mis a scalar from the i-th row and j-th column of the modulation matrix M, G. . . Gis the k-th base matrix Gand M·Gdenotes the multiplication of the elements of Gby the scalar M; 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.