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. 19, 1999
Filed:
Aug. 25, 1997
Seong-Kyu Hwang, Seoul, KR;
SamSung Electronics Co., Ltd., Kyungki-do, KR;
Abstract
A circuit for detecting a frequency correction burst in a TDMA digital mobile communication system. The circuit comprises a first multiplier for inputting I-channel data modulated by a continuous phase shift key and multiplying the inputted I-channel data by a sine wave frequency of the frequency correction burst to produce a first channel signal I1(nT); a second multiplier for inputting Q-channel data modulated by the continuous phase shift key and multiplying the inputted Q-channel data by the sine wave frequency of the frequency correction burst to produce a second channel signal Q1(nT); a low-pass filter for lowpass-filtering the first and second channel signals I1(nT) and Q1(nT) to produce first and second filtered channel signals I2(nT) and Q2(nT); a first energy estimation unit for estimating energies of the first and second channel signals I1(nT) and Q1(nT), respectively to generate a first instantaneous signal energy E.sub.p (nT); a second energy estimation unit for estimating energies of the first and second channel signals I1(nT) and Q1(nT), respectively to generate a second instantaneous signal energy E.sub.q (nT); a normalization unit for normalizing the first instantaneous signal energy E.sub.p (nT) to the second instantaneous signal energy E.sub.q (nT) to generate a normalized signal G(nT); and a burst discriminator for detecting only a frequency correction burst from the normalized signal G(nT).