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. 30, 2012
Filed:
Oct. 19, 2009
Method and apparatus for phase reference tracking of digital phase modulated signals in the receiver
Pansop Kim, Torrance, CA (US);
Jeng-hong Chen, Temple City, CA (US);
Hsin-hsiang Liu, Torrance, CA (US);
Pansop Kim, Torrance, CA (US);
Jeng-Hong Chen, Temple City, CA (US);
Hsin-Hsiang Liu, Torrance, CA (US);
ISSC Technologies Corp., Hsinchu, TW;
Abstract
The present invention discloses a method and apparatus to provide, effectively and robustly, a phase reference in phase-domain for digital phase-modulated signals. Not only the first-order but also higher order PLLs are delineated for robust and fast tracking of frequency errors and time-varying frequency errors between the transmitter and the receiver. This invention can be applied to any phase-modulated signal such as PSK, DPSK, π/4-DPSK, and CPM. The decoders with this invention can achieve close to the performance of coherent detection. Reference [1] D. Divsalar and M. K. Simon, 'Multiple-symbols differential detection of MPSK,'., vol. 38, pp. 300-308, March 1990. [2] Specification of the Bluetooth System, 2.0+EDR, 4 Nov. 2004.