Title :
Block spreading for discrete multi-tone CDMA systems in the presence of frequency-selective fading
Author :
Leus, Geert ; Moonen, Marc
Author_Institution :
ESAT, Katholieke Univ., Leuven, Belgium
Abstract :
We discuss a quasi-synchronous discrete multi-tone CDMA (DMT-CDMA) system based on block spreading, with a block size equal to the DMT symbol size, in the presence of frequency-selective fading. For such a system, we develop a simple receiver that completely removes the multi-user interference (MUI) and (single-user) inter-tone interference (ITI), when a special set of code sequences is used. As a result the BER does not saturate as the noise decreases, in contrast to a related existing receiver for a standard DMT-CDMA system in the presence of frequency-selective fading.
Keywords :
OFDM modulation; code division multiple access; codes; correlators; error statistics; fading channels; interference suppression; multiuser channels; radio receivers; radiofrequency interference; spread spectrum communication; BER; DMT symbol size; DMT-CDMA system; block size; block spreading; channel estimation; code sequences; discrete multi-tone CDMA systems; frequency-selective fading; inter-tone interference; multiuser interference; noise; quasi-synchronous discrete multi-tone CDMA; receiver; single-user interference; Bit error rate; Code division multiplexing; Code standards; Electrical equipment industry; Fading; Frequency; Interference; Laboratories; Multiaccess communication; OFDM modulation;
Conference_Titel :
Signals, Systems, and Computers, 1999. Conference Record of the Thirty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-5700-0
DOI :
10.1109/ACSSC.1999.832018
