Códigos Unipolares para Aplicações em CDMA Óptico<br />10.14209/jcis.2000.2

Abstract

Several code-division multiple access schemes have been proposed for photonic systems. Specifically, for such applications using the non-coherent optical fields superposition principle, most works are focused on the construction of specific codes and its error performance analysis, due the action of the channel noise and/or interference. In opposition, this paper establishes first a theoretical basis on the performance analysis of the unipolar signal detection under additive and strictly positive interference, taking in account either podal or orthogonal signaling. Furthermore, the performance of unipolar CDMA systems is investigated under the perspective of standard detection, or hard limiting techniques. Finally, a new class of time-hopping codes is proposed, which allows large sequence diversity. It has potential to achieve better error performance, when compared to the codes investigated earlier.