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:
Apr. 18, 2006
Filed:
Aug. 03, 2001
Azzedine Touzni, Doylestown, PA (US);
Raúl A. Casas, Doylestown, PA (US);
Thomas J. Endres, Kent, WA (US);
Stephen L. Biracree, Jamison, PA (US);
Christopher H. Strolle, Fort Washington, PA (US);
Samir N. Hulyalkar, Newtown, PA (US);
Azzedine Touzni, Doylestown, PA (US);
Raúl A. Casas, Doylestown, PA (US);
Thomas J. Endres, Kent, WA (US);
Stephen L. Biracree, Jamison, PA (US);
Christopher H. Strolle, Fort Washington, PA (US);
Samir N. Hulyalkar, Newtown, PA (US);
ATI Research, Inc., Santa Clara, CA (US);
Abstract
Carrier phase recovery employs a single-axis blind cost criterion from the Bussgang class of functions, and its stochastic gradient, to generate a carrier phase error used to adjust a received and demodulated signal to near baseband. For one implementation, the estimate is derived in accordance with a Single-Axis Constant Modulus (SA-CM) criterion and its stochastic gradient via a SA-CM algorithm (SA-CMA). The carrier phase error is then used to adjust the carrier frequency and phase of the received and demodulated signal toward the frequency and phase of the carrier used to modulate the transmitted symbols, driving the carrier phase error to zero. The values used for the phase recovery may be either i) an IIR filtered signal, ii) a processed signal (e.g., decisions for the signal symbols), or iii) an equalized and processed signal.