Efficient implementation of pilot-aided 32 QAM for fixed wireless and mobile ISDN applications

Author

Fahim Tariq, M. ; Nix, Andrew ; Love, Derek

Author_Institution

Centre for Commun. Res., Bristol Univ., UK

Volume

1

fYear

2000

fDate

2000

Firstpage

680

Abstract

This paper presents the design and performance of a pilot tone-aided 32 QAM modem developed for wireless ISDN applications. The modem is capable of transmitting a gross data rate of 70 kbit/s in a 20 kHz channel spacing. A low complexity receiver has been designed that allows the effects of fading and frequency offset to be removed digitally at a low IF using information extracted from the pilot tone. The design has been fully evaluated in narrowband Rayleigh and Rician fading channels. Computer simulations show that extreme Doppler shifts and frequency offsets have little effect on system performance. The design is suitable for mobile radio as well as fixed applications such as wireless in the local loop (WLL)

Keywords

Doppler shift; ISDN; Rayleigh channels; Rician channels; land mobile radio; modems; quadrature amplitude modulation; radio access networks; 20 kHz; 32 QAM modem; 70 kbit/s; AWGN; Doppler shifts; WLL; channel spacing; computer simulations; data rate; fixed wireless ISDN applications; frequency offsets; low IF; low complexity receiver; mobile ISDN applications; narrowband Rayleigh fading channel; narrowband Rician fading channel; pilot tone; pilot-aided 32 QAM; system performance; transceiver; wireless in the local loop; Channel spacing; Computer simulation; Data mining; Frequency; ISDN; Modems; Narrowband; Quadrature amplitude modulation; Rayleigh channels; Rician channels;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st

Conference_Location

Tokyo

ISSN

1090-3038

Print_ISBN

0-7803-5718-3

Type

conf

DOI

10.1109/VETECS.2000.851545

Filename

851545