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:
May. 06, 2008
Filed:
Feb. 19, 2004
Richard B. Ertel, Midvale, UT (US);
Dan M. Griffin, Bountiful, UT (US);
Johnny M. Harris, Centerville, UT (US);
Eric K. Hall, Holliday, UT (US);
Thomas R. Giallorenzi, Riverton, UT (US);
Richard B. Ertel, Midvale, UT (US);
Dan M. Griffin, Bountiful, UT (US);
Johnny M. Harris, Centerville, UT (US);
Eric K. Hall, Holliday, UT (US);
Thomas R. Giallorenzi, Riverton, UT (US);
L-3 Communications Corporation, New York, NY (US);
Abstract
A method is presented for estimating a phase error for first (r) and second (r) orthogonal signal components spread respectively by different first cand second cspreading codes. A cross-despread value IdQ and/or QdI is determined by despreading one signal component with the spreading codes associated with the other signal component (rwith cor rwith c). In parallel, the same signal component is also despread with its associated spreading code to determine an estimated data symbol for that component. An interference of Q into I or I into Q is calculated and multiplied by the estimated data symbol, and subtracted from the cross-despread value to achieve an estimate of phase error. Preferably, both cross-despread values are obtained, normalized to a common data rate, scaled to maximize signal to noise ratio, and combined into one phase error estimate. A phase error detector includes despreaders, multipliers, and adders to determine the cross-despread value and subtract the interference from it.