A UHF-band digital pre-distortion power amplifier using weight divided adaptive algorithm

Author

Horiguchi, K. ; Miki, M. ; Nagano, J. ; Senda, H. ; Yamauchi, K. ; Nakayama, M. ; Takagi, T.

Author_Institution

Inf. Technol. R & D Center, Mitsubishi Electr. Corp., Kanagawa, Japan

Volume

3

fYear

2004

fDate

6-11 June 2004

Firstpage

2019

Abstract

A look up table (LUT) type adaptive digital pre-distortion (ADPD) using a weight divided adaptive algorithm is presented. In this algorithm, an output signal of the power amplifier (PA) is used as a reference signal. Additionally, reference signal is divided by the coefficient of the LUT, so that the characteristics of the PA, such as temperature dependence, do not have influence on the convergence performances. The proposed algorithm is presented and the convergence condition is derived analytically. From the ADPD simulation, we present that the proposed algorithm is more stable than the conventional normalized least mean square (NLMS) algorithm. The developed UHF-band ADPD power amplifier achieved the intermodulation (IM) distortion of -50dBc and the PA efficiency of 18% at output power of 54.8dBm under an integrated services digital broadcasting for terrestrial television broadcasting (ISDB-T) OFDM signal.

Keywords

UHF power amplifiers; adaptive filters; intermodulation distortion; least mean squares methods; stability; table lookup; television broadcasting; OFDM signal; UHF-band power amplifier; adaptive digital predistortion; adaptive filters; convergence condition; digital predistortion power amplifier; integrated services digital broadcasting; intermodulation distortion; look up table; normalized least mean square algorithm; reference signal; temperature dependence; terrestrial television broadcasting; weight divided adaptive algorithm; Adaptive algorithm; Algorithm design and analysis; Communication standards; Convergence; Data communication; Digital multimedia broadcasting; Multiplexing; Power amplifiers; Table lookup; Temperature dependence;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2004 IEEE MTT-S International

ISSN

0149-645X

Print_ISBN

0-7803-8331-1

Type

conf

DOI

10.1109/MWSYM.2004.1339009

Filename

1339009