Title :
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
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;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851545
