Summary
International Symposium on Nonlinear Theory and its Applications
2005
Session Number:1-3-5
Session:
Number:1-3-5-5
Chaos-Based Multi-Carrier CDMA: Orthogonal Subspace Approach
G. Setti, G. Mazzini, R. Rovatt,
pp.106-109
Publication Date:2005/10/18
Online ISSN:2188-5079
Summary:
Multi-code DS-CDMA systems assign more than one spreading sequence to each of the users. In these systems multiple access interference (MAI) is made of a synchronous and an asynchronous component. We propose an orthonormalization approach aiming at coupling the advantages of orthogonal code design in countering synchronous MAI with that of chaos-based codes in countering asynchronous MAI. Improvements with respect of classical orthogonal-i.i.d. sequences in terms of signal-tointerference ratio are demonstrated by simulations. The effect of quantization in sequence storing and processing is also taken into account.