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:
Nov. 23, 2004
Filed:
Jan. 05, 2001
Bruce D. Mueller, Palatine, IL (US);
Yumin Lee, Taipei, TW;
Motorola, Inc., Schaumburg, IL (US);
Abstract
A baseband detector includes a complex differential detector, a constellation point computer, and a phase shift keying (PSK) decoder. The complex differential detector outputs complex values in response to digitized samples derived from a received baseband signal. The PSK decoder generates decoded bits representing information symbols by determining in minimum distance between the complex values and plural constellation points provided by the constellation point computer. The constellation point computer can adaptively generate the constellation points based on a training sequence of information symbols and their corresponding complex valued outputs from the complex differential detector. The baseband detector can be used for frequency shifting keying (FSK) and differential phase shift keying (DPSK) demodulation in direct conversion receivers (DCRs).