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Downlink beamforming for cellular mobile communications (gsm system)

Traitement d’antenne adaptatif sur la voie descendante pour un systeme de radiocommunication cellulaire


This paper is concerned with the possible implementation of antenna array processing at the base station of cellular radiomobile networks, typically theGsm case. It first explains how those antennas would increase the capacity of such a network, processing uplink as well as downlink. Then the attention is focused on downlink processing, that has been lesser studied than uplink processing and is a more difficult case due to frequency duplex division, but remains of high interest because it may turn into a bottleneck if not handled well. A criterion for transmit and some solutions to optimize it are then suggested and compared, before we conclude.


Cet article envisage l’implantation d’antennes adaptatives aux stations de base des systèmes de radiocom-munications cellulaires avec les mobiles, typiquement le systemeGsm. Il rappelle d’abord comment ces antennes permettraient d’augmenter la capacité de tels systèmes, traitant aussi bien le lien montant que le lien descendant. On s’interesse ensuite plus spécifiquement au lien descendant, qui a recu moins d’interêt ces dernières années que le lien montant, et est plus compliqué à cause de la présence du duplex frequentiel. Il reste cependant d’une grande importance car il ne doit pas devenir un goulot d’étranglement du système. Un critère d’émission est proposé, ainsi que des solutions pour l’optimiser, qui sont comparées avant de conclure.

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Author information

Correspondence to Thierry Asté or Philippe Forster or Luc Féty or Sylvie Mayrargue.

Additional information

This work was supported byCnet, Centre National d’Étude des Télécommunications. It is protected by patent Number 96 13597

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Asté, T., Forster, P., Féty, L. et al. Downlink beamforming for cellular mobile communications (gsm system). Ann. Télécommun. 53, 435–448 (1998).

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Key words

  • Mobile radiocommunication
  • Cellular network
  • Gsm
  • Beamforming
  • Space diversity
  • Adaptive antenna
  • Frequency conversion
  • Arrival angle
  • Statistical estimation

Mots clés

  • Radiocommunication service mobile
  • Réseau cellu-laire
  • Gsm
  • Mise forme faisceau
  • Diversité spatiale
  • Antenne adaptative
  • Conversion fréquence
  • Angle arrivée
  • Estimation statistique