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:
Mar. 29, 2005
Filed:
Oct. 30, 2000
Dengwei Fu, Santa Clara, CA (US);
Alan N. Willson, Jr., Pasadena, CA (US);
Dengwei Fu, Santa Clara, CA (US);
Alan N. Willson, Jr., Pasadena, CA (US);
Pentomics, Inc., Pasadena, CA (US);
Abstract
A rectangular-to-polar-converter receives a complex input signal (having Xand Ycomponents) and determines an angle φ that represents the position of the complex signal in the complex plane. The rectangular-to polar-converter determines a coarse angle φand a fine angle φ, where φ=φ+φ. The coarse angle φis obtained using a small arctangent table and a reciprocal table. These tables provide just enough precision such that the remaining fine angle φis small enough to approximately equal its tangent value. Therefore the fine angle φcan be obtained without a look-up table, and the fine angle computations are consolidated into a few small multipliers, given a precision requirement. Applications of the rectangular-to-polar converter include symbol and carrier synchronization, including symbol synchronization for bursty transmissions of packet data systems. Other applications include any application requiring the rectangular-to-polar conversion of a complex input signal.