On Asymptotic Efficiency for Asynchronous CDMA

Author

Romano, Gianmarco ; Ciuonzo, Domenico ; Palmieri, Francesco ; Rossi, Pierluigi Salvo

Author_Institution

Dipt. di Ingegneria dell´´Informazione, Seconda Univ. di Napoli, Aversa, Italy

fYear

2007

fDate

14-16 March 2007

Firstpage

174

Lastpage

178

Abstract

We consider asynchronous CDMA systems and analyze their performances in terms of asymptotic efficiency when linear receivers are employed and the system becomes overloaded. We show that in such systems, differently from synchronous systems, linear detectors can be asymptotically efficient and, specifically, that the MMSE detector is asymptotically efficient with probabilty. Simulations confirm that it is better to be asynchronous than synchronous and even under heavy overloading the MMSE receiver is still asymptotically efficient.

Keywords

code division multiple access; least mean squares methods; radio receivers; MMSE detector; MMSE receiver; asymptotic efficiency; asynchronous CDMA; linear detectors; linear receivers; Computational modeling; Control systems; Degradation; Delay effects; Detectors; Interference cancellation; Multiaccess communication; Multiuser detection; Performance analysis; Random variables; CDMA; asynchronous CDMA; multiuser detection; overloaded CDMA;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Sciences and Systems, 2007. CISS '07. 41st Annual Conference on

Conference_Location

Baltimore, MD

Print_ISBN

1-4244-1063-3

Electronic_ISBN

1-4244-1037-1

Type

conf

DOI

10.1109/CISS.2007.4298295

Filename

4298295