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:
Sep. 17, 2002
Filed:
Feb. 01, 1999
Takashi Asahara, Tokyo, JP;
Makoto Miyake, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention aims to obtain a demodulator with improved receiving performance such as bit error rate characteristic by reducing the estimation error of the fading distortion even in case of transmitted signal in the channel which is much influenced by not only fading variation but also the thermal noise such as in the nonfading channel. In the demodulator of the invention has a configuration where the carrier is estimated using the known signal to perform the coherent detection. In the carrier estimator, the fading distortion estimator obtains a predetermined form of the estimation of the fading distortion using the known signal, the fading distortion compensator eliminates the fading distortion estimated from the received signal by a predetermined compensating method. The averaging unit obtains the average value of the compensated signal, of which the modulation component was eliminated from the output of the fading distortion compensator. The estimated signal generator compounds the averaged value output from the averaging unit and the estimated value of the fading distortion output from the fading distortion estimator to obtain the reference signal. The signal compensator performs the coherent detection using the reference signal obtained by the estimated signal generator.