UWB Multiple Access Communication System |
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Authors: | F Elbahhar A Rivenq J M Rouvaen M Heddebaut |
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Affiliation: | (1) Silifke-Tasucu Vocational High School, Selcuk University, 33900 Icel, Turkey;(2) Department of Electrical and Electronic Engineering, Erciyes University, 38039 Kayseri, Turkey |
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Abstract: | Recently, the emerging Ultra-Wideband (UWB) impulse technology has found numerous applications in the civil as well as the
military sectors. In this paper, an UWB multi-user communication system is studied. In a previous work, two systems (DS–CDMA–UWB
and Gegenbauer–UWB) were compared in a rather simple case: only two users were considered, and a perfect synchronization between
each receiver and transmitter for the two users was assumed. In the present paper, a more general case is studied. Different
synchronous (different users detected at the same time or with constant delays) and asynchronous (each user transmitting independantly
of other) scenarios are introduced. The interferences between users are also taken into account (for two users and more).
Two systems are described and analyzed and their performance in terms of Bit Error Rate (BER), synchronization errors and
users interference is studied by simulation. The first system, which is only based on orthogonal UWB waveforms called Modified
Gegenbauer functions (MGF), gives a satisfactory multi-user detection in the synchronous case only. The second one uses an
hybrid coding technique: an UWB orthogonal coding is associated to a spread spectrum DS–CDMA (Direct Sequence Code Division
Multiple Access) technique (in fact a combination of the two systems sudied in the previous work). This allows an efficient
multi-user detection in the asynchronous case. |
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