Title:
適応事前等化方法及び装置
Document Type and Number:
Japanese Patent JP2005538578
Kind Code:
A
Abstract:
An adaptive pre-equalizer is disclosed to compensate amplitude ripples in a low cost transmitter pass-band filter. A filtered-x LMS algorithm is proposed to calculate the equalizer coefficients. To this purpose, the modulated RF signal is demodulated at the transmitter and subtracted from a filtered version of the original base band signal. The impulse response of the low-cost transmit filter is approximated by a delay. The disclosure may be applied to direct conversion or heterodyne transmitters using OFDM.
Inventors:
Coel Smeyer Edmund
Application Number:
JP2004520921A
Publication Date:
December 15, 2005
Filing Date:
July 15, 2002
Export Citation:
Assignee:
NOKIA CORPORATION
International Classes:
H03H21/00; H04B7/005; H04J11/00; H04L25/03; H04L27/36; H04L27/26; (IPC1-7): H04B7/005; H03H21/00; H04J11/00
Attorney, Agent or Firm:
Kawamori Mitsunori