AN OFDM-CDMA SCHEME FOR HIGH DATA RATE UWB APPLICATIONS
Ultra-Wide Band (UWB) radio systems are today acknowledged as high potential solutions for Wireless Personal Area Networks (WPAN). The novelty of these systems lies in the possibility of non-regulated access to the spectral resource leading to flexible use of the radio channel for an important number of applications. A new waveform for UWB systems obtained by the combination of Orthogonal Frequency Division Multiplex (OFDM) and Coded Division Multiple Access (CDMA). The Spread Spectrum - Multi-Carrier - Multiple Access (SS-MC-MA) can be viewed as a multi-block system compared to the classical MC-CDMA system since the spectrum is divided into” blocks” of several subcarriers. The SS-MC-MA turns out to be a judicious solution to combat frequency selectivity and narrow-band interferers and to manage the coexistence of several users and piconets. The main interest of this solution is better resource allocation in multi-user and multi-piconet as well as better robustness against frequency selectivity and narrow-band interferers. With SS-MC-MA, the addition of a degree of freedom brought by the spreading component allows optimizing jointly the assignment of the number of used codes and coding rates.
Reference Paper: An OFDM-CDMA scheme for High Data Rate UWB applications
Author’s Name: Emeric Gueguen, Matthieu Crussiere, and Jean-Francois Helard
Year:2007
Source: IEEE
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