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 narrowband 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 narrowband 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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