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. 04, 2020
Filed:
Jan. 10, 2019
Nec Corporation, Tokyo, JP;
Yoshiaki Doi, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A DPD operates at a sampling rate at which the input signal not up sampled at an upstream of the DPD is sampled. The DPD includes a polynomial structure comprising a pseudo-interpolation and sub-sample shift processing unit configured to pseudo-interpolate a sample point between the sample points of the input signal and shift the pseudo-interpolated sample point by a sub-sample, and an FIR (Finite Impulse Response) filter disposed at a downstream of the polynomial structure and including a sub-sample delay filter configured to delay the sample point of the input signal by the sub-sample. The DPD uses the polynomial structure and the FIR filter to compensate distortion by the sample point of the input signal and also compensate distortion by a sub-sample point between the sample points of the input signal for the digital predistorter.