Title :
An OFDM-CDMA Scheme for High Data Rate UWB Applications
Author :
Guéguen, Emeric ; Crussière, Matthieu ; Hélard, Jean-François
Author_Institution :
Rennes Electron. & Telecommun. Inst., IETR/INSA, Rennes
Abstract :
In this paper, we investigate a new waveform for UWB systems obtained by the combination of orthogonal frequency division multiplex (OFDM) and coded division multiple access (CDMA). The proposed system, called spread spectrum multi-carrier - multiple access (SS-MC-MA) turns out to be a judicious solution to combat frequency selectivity and narrowband interferers, and to manage the coexistence of several users and piconets. It is shown that the addition of a degree of freedom brought by the spreading component of SS-MC-MA allows to optimize jointly the assignment of the number of used codes and coding rates in order to make the system more robust. Through simulations, it is demonstrated that the new system can outperform multi-band OFDM alliance (MBOA) for low data rates and is able to provide wider range of rates.
Keywords :
OFDM modulation; code division multiple access; encoding; interference suppression; personal area networks; radiofrequency interference; spread spectrum communication; ultra wideband communication; OFDM-CDMA scheme; coded division multiple access; coding rates; frequency selectivity; high data rate UWB applications; multi-band OFDM alliance; narrowband interferers; orthogonal frequency division multiplex; piconets; spread spectrum-multi-carrier-multiple access; Bandwidth; FCC; Frequency division multiplexing; Multiaccess communication; Narrowband; OFDM; Personal area networks; Spread spectrum communication; Time division multiple access; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th
Conference_Location :
Dublin
Print_ISBN :
1-4244-0266-2
DOI :
10.1109/VETECS.2007.596