Titre du document / Document title

Performance of a fixed-beam system in the IS-95 CDMA forward link

Auteur(s) / Author(s)

MOORTI T. ⁽¹⁾ ; PAULRAJ A. ⁽¹⁾ ; STÜTZLE R. ⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Information Systems Laboratory, Stanford University, Stanford, CA 94305, ETATS-UNIS
⁽²⁾ Institute for Network Theory and Circuit Design, Technical University Munich, 80290 München, ALLEMAGNE

Résumé / Abstract

We study the performance of a fixed-beam system in the forward link of IS-95 CDMA systems by means of Monte Carlo simulations. The simulations are performed using a comprehensive model of the forward link which includes correlated shadowing, soft and softer handoff, and transmit power allocation. The effects of user distribution, soft/softer handoff threshold, and multipath diversity are examined. We find that the availability of signal diversity plays an important role in the system performance. When the soft handoff threshold is decreased from -12 dB to -18 dB, capacity increases by 15%, but handoff overhead more than doubles. When fifty percent of users have 2-ray multipath, capacity increases by 18%. Thus. the availability of multipath in the system has a dramatic influence on forward link capacity. A non-uniform distribution using a highways model reduces capacity by more than a half. This shows that for successful implementation of a fixed-beam system. it is important to plan cell sites in a way that keeps loading uniformly distributed in azimuth.

Revue / Journal Title

European transactions on telecommunications   ISSN 1124-318X 

Source / Source

1998, vol. 9, n^o 4 (68 p.)  (11 ref.), pp. 361-370

Langue / Language

Anglais

Editeur / Publisher

Wiley, Chichester, ROYAUME-UNI  (1995) (Revue)

Mots-clés anglais / English Keywords

Code division multiple access ; Mobile radiocommunication ; Performance analysis ; Monte Carlo method ; Simulation ; Multipath propagation ; Cell network ; Hadamard transformation ; Gaussian distribution ; Rayleigh fading ;

Mots-clés français / French Keywords

Accès multiple code ; Radiocommunication service mobile ; Analyse performance ; Méthode Monte Carlo ; Simulation ; Propagation trajet multiple ; Réseau cellulaire ; Transformation Hadamard ; Loi normale ; Evanouissement Rayleigh ; Faisceau fixe ; IS-95 ; Récepteur RAKE ;

Mots-clés espagnols / Spanish Keywords

Acceso múltiple codificado ; Radiocomunicación servicio móvil ; Análisis eficacia ; Método Monte Carlo ; Simulación ; Propagación trayecto múltiple ; Red celular ; Transformación Hadamard ; Curva Gauss ; Desvanecimiento Rayleigh ;

Localisation / Location

INIST-CNRS, Cote INIST : 3741, 35400007262125.0040