Full Digital Adaptive Equalization in 64-QAM Radio Systems

Author

Baccetti, Baccio ; Bellini, Sandro ; Filiberti, Gaudenzio ; Tartara, Guido

Author_Institution

GTE Telecomunicazioni S.p.A., Cassina de´´Pecchi, Milano, Italy

Volume

5

Issue

3

fYear

1987

fDate

4/1/1987 12:00:00 AM

Firstpage

466

Lastpage

475

Abstract

In view of a digital implementation of most of the signal processing required in a QAM demodulation-equalization Structure, a performance analysis as a function of equalizer complexity, A/D conversion resolution, and precision of internal arithmetic is presented. The analysis is focused on a 140 Mbit/s 64-QAM modulation scheme (corresponding to CEPT-4 or $3 \\times DS3$ systems), but extension to other QAM constellations is straightforward. Considerations of currently available technology, overall computational complexity, and related optimal quantization formats are presented. For high-speed 64 QAM, it is shown that satisfactory performance may be expected from a full digital implementation of reasonable complexity, using current technology.

Keywords

Adaptive equalizers; Digital filter wordlength effects; Quadrature amplitude modulation; Adaptive equalizers; Baseband; Bit error rate; CMOS process; CMOS technology; Demodulation; Digital arithmetic; Performance analysis; Quadrature amplitude modulation; Space technology;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/JSAC.1987.1146547

Filename

1146547