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:
Aug. 17, 2004
Filed:
May. 31, 2000
Joseph Boccuzzi, Staten Island, NY (US);
S. Unnikrishna Pillai, Harrington Park, NJ (US);
Cadence Design Systems, Inc., San Jose, CA (US);
Abstract
Method and system for recognizing the presence of a reference signal having M components. A signal s(t) is received that may contain a reference signal s(t;ref). An M×M covariance matrix of the M components of the received signal is formed, and M eigenvector solutions V=V and associated eigenvalue solutions &lgr;=&lgr; (j=1, 2, . . . , M) of the matrix relation R·V=&lgr; V are determined. A subspace S′ of the space spanned, spanned by a selected subset of the vectors V (j′=1, . . . , N(s)) is formed, with N(s) a selected number that is ≦M. Product signals s(t)·V (t) are formed and integrated over a selected time interval, t ≦t′≦t, to form estimation signals x (t) (j′=1, . . . , N(s)). The estimation signal x (t) and the reference signal s(t;ref) are used to determine a weighting coefficient w (t) (j′=1, . . . , N(s)), using a selected weighting criterion, and a sum signal of products of the weighting coefficients and the eigenvectors V (t) is formed, as an estimate of the reference signal contribution to the received signal.