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Channelization for software defined base-stations

Sélection des canaux dans les stations de base définies par logiciel

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Abstract

Channelization is the task of channel selection in a communications receiver. Usually it comprises down-conversion of the signal to base-band and channel filtering. To be able to influence the characteristics of channelization by means of software it is advantageous to realize as much as possible of the channelization functionality with digital signal processing. In base-stations several channels have to be received in parallel. An obvious approach to meet this task is to have a separate channelizer for each channel. This so-called per-channel approach does not look very elegant. An alternative is to employ filter banks. This promises to save much effort since the necessary filter is implemented only once for all channels. Both approaches are introduced and discussed in detail. Finally, they are compared with respect to their multiplication rate. The result of this comparison is somewhat surprising.

Résumé

La canalisation désigne la tâche du récepteur de sélectionner un canal désiré. En général, cette tâche est réalisée par un mixage du signal en bande de base et un filtrage. Afin qu ’on puisse ajuster les caractéristiques de la canalisation, il est avantageux de réaliser cette fonctionnalité autant que possible par un traitement de signal numérique. Aux stations de base il faut recevoir plusieurs canaux en parallèle, ce qui peut être réalisé évidemment par une unité de canalisation pour chaque canal. Cette méthode, nommée perchannel approach, n ’est pas très élégante. Alternativement, on peut utiliser un banc de filtre ce qui promet d’économiser beaucoup d’efforts en réalisant seulement un filtre pour tous les canaux. Ces deux méthodes sont présentées et discutées en détail. Finalement, elles sont comparées l’une avec l’autre relatif à vos taux de multiplication. Ce résultat de comparaison est un peu surprenant.

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  1. Vodafone Chair Mobile Communications Systems, Technische Universität Dresden, D-01062, Dresden, Germany

    Tim Hentschel

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  1. Tim Hentschel
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Correspondence to Tim Hentschel.

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Hentschel, T. Channelization for software defined base-stations. Ann. Télécommun. 57, 386–420 (2002). https://doi.org/10.1007/BF02995169

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