In overloaded CDMA systems the high correlation among users’ signatures determines an overall performace that can be quite poor even for the optimal ML receiver. The geometric properties of signatures affect users’ separability, a condition that is necessary for achieving asymptotic efficiency. In this paper we establish gaussian separability conditions and propose an algorithm for the design of users’ gain in a way that guarantees users’ separability. Simulations show that the overall system performace can benefit of properly designed gain distribution as low-complexity iterative receivers can get near-optimal performances.
Separability and gain control for overloaded CDMA / G., Romano; F., Palmieri; P., Willet; Mattera, Davide. - (2005), pp. 1-5. (Intervento presentato al convegno CISS'05 tenutosi a Baltimore (MD, USA) nel march 2005).
Separability and gain control for overloaded CDMA
MATTERA, DAVIDE
2005
Abstract
In overloaded CDMA systems the high correlation among users’ signatures determines an overall performace that can be quite poor even for the optimal ML receiver. The geometric properties of signatures affect users’ separability, a condition that is necessary for achieving asymptotic efficiency. In this paper we establish gaussian separability conditions and propose an algorithm for the design of users’ gain in a way that guarantees users’ separability. Simulations show that the overall system performace can benefit of properly designed gain distribution as low-complexity iterative receivers can get near-optimal performances.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
