Phase error free LINC modulator

Author

Tomisato, S. ; Chiba, K. ; Murota, K.

Author_Institution

NTT Radio Commun. Syst., Labs., Kanagawa, Japan

Volume

25

Issue

9

fYear

1989

fDate

4/27/1989 12:00:00 AM

Firstpage

576

Lastpage

577

Abstract

A new technique for linear amplification with nonlinear components (LINC) is described. LINC implementation is thought to be very difficult because of its sensitivity to phase error caused by the difference in electrical length between two power amplifier branches. The allowable limit of phase error for achieving the 60 dB suppression of the adjacent channel interference (ACI) power is estimated for roll-off bandlimited offset QPSK (OQPSK). Then, a compensating method for this phase error is presented. By using the proposed method, sufficient out-of-band spectrum suppression for mobile radio application is obtained. An output power of 7.5 W and a power efficiency of 21% are experimentally confirmed.

Keywords

digital radio systems; error compensation; interference suppression; mobile radio systems; modulators; phase shift keying; 21 percent; 7.5 W; LINC modulator; adjacent channel interference; digital mobile radio; electrical length; linear amplification with nonlinear components; mobile radio application; out-of-band spectrum suppression; output power; phase error; power amplifier branches; power efficiency; roll-off bandlimited offset QPSK;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19890392

Filename

19789