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:
Feb. 12, 2002
Filed:
Nov. 04, 1998
Takayuki Nagayasu, Tokyo, JP;
Keishi Murakami, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Distortion of a received signal due to intersymbol interference as well as to frequency offset is corrected. For this reason, a frequency offset correcting circuit corrects a received signal based on a frequency-offset estimated value. A first CIR estimating circuit estimates CIR estimated values at a first position according to a known training sequence in the corrected received signal. Also, a second estimating circuit updates the CIR estimated values with the LMS algorithm according to the corrected received signals as well as to the decision value outputted from the equalizer with the CIR estimated values at the first position as initial values and obtains CIR estimated values at a second position apart from the first position. A phase deviation detecting circuit computes phase deviations based on CIR estimated values at the first position as well as on CIR estimated values at the second position, and an averaging circuit averages the phase deviations, and outputs the averaged value to the frequency offset correcting circuit as a frequency-offset estimated value.