Digital predistortion of frequency multiplier for dual band wireless LAN transmitter

Author

Choi, Jae Hong ; Kang, Sung Min ; Koo, Kyung Heon

Author_Institution

Dept. of Electron. Eng., Incheon Univ., South Korea

fYear

2005

fDate

12-17 June 2005

Abstract

In this paper, a digital predistortion technique to linearize frequency multiplier for dual-band wireless LAN transmitter is presented. The frequency multiplier is used to generate 5.8GHz wireless LAN signal by multiplying 2.9GHz input, however, it distorts the input OFDM signal severely. This paper has analyzed the nonlinear distortion of the frequency multiplier by modeling it as a memoryless Volterra system, and proposed a simple digital predistortion algorithm to get the proper 5GHz band wireless LAN signal. The linearized frequency doubler shows 20.1 dB and 19dB ACPR improvement, respectively at 11MHz and 20MHz offset from center frequency by using the proposed predistortion linearization.

Keywords

frequency multipliers; linearisation techniques; nonlinear distortion; radio transmitters; wireless LAN; 11 MHz; 2.9 GHz; 20 MHz; 5 GHz; 5.8 GHz; digital predistortion technique; dual band wireless LAN transmitter; frequency doublers; frequency multipliers; input OFDM signal distortion; memoryless Volterra system; nonlinear distortion; predistortion linearization; Algorithm design and analysis; Dual band; Frequency; Nonlinear distortion; OFDM; Predistortion; Signal analysis; Signal generators; Transmitters; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2005 IEEE MTT-S International

ISSN

01490-645X

Print_ISBN

0-7803-8845-3

Type

conf

DOI

10.1109/MWSYM.2005.1517136

Filename

1517136