Title :
Effect of overlapping between successive carriers of multicarrier CDMA on the performance in a multipath fading channel
Author :
Elnoubi, Said M. ; El-Beheiry, Ahmed
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
fDate :
5/1/2001 12:00:00 AM
Abstract :
The effect of the overlapping between successive carriers of a multicarrier code-division multiple-access system on the performance in a multipath fading channel is investigated. Transmitted data bits are serial to parallel converted to a number of parallel branches. On each branch each bit is direct-sequence spread-spectrum modulated and transmitted with certain number of carriers. The separation between successive carriers is allowed to vary to achieve various overlapping percentages. The system is analyzed with a conventional matched filter receiver. It is shown that for each number of carriers there exists an optimum overlapping percentage at which the performance of the system is optimized. The results show that a considerable improvement can be achieved
Keywords :
approximation theory; code division multiple access; error statistics; fading channels; filtering theory; matched filters; modulation; multipath channels; multiuser channels; radio receivers; spread spectrum communication; BER; DS-SS; Gaussian approximation; channel model; code-division multiple-access; direct-sequence spread-spectrum modulation; error probability; interference; matched filter receiver; multicarrier CDMA; multipath fading channel; nonorthogonal multicarrier system; optimized system performance; overlapping percentage; parallel branches; successive carriers overlapping; transmitted data bits; Bandwidth; Bit rate; Fading; Intersymbol interference; Matched filters; Multiaccess communication; Multicarrier code division multiple access; Multipath channels; Spread spectrum communication; System performance;
Journal_Title :
Communications, IEEE Transactions on
