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  • Research Article
  • Open Access

Flexible Radio: A Framework for Optimized Multimodal Operation via Dynamic Signal Design

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EURASIP Journal on Wireless Communications and Networking20052005:850819

  • Received: 16 March 2005
  • Published:


The increasing need for multimodal terminals that adjust their configuration on the fly in order to meet the required quality of service (QoS), under various channel/system scenarios, creates the need for flexible architectures that are capable of performing such actions. The paper focuses on the concept of flexible/reconfigurable radio systems and especially on the elements of flexibility residing in the PHYsical layer (PHY). It introduces the various ways in which a reconfigurable transceiver can be used to provide multistandard capabilities, channel adaptivity, and user/service personalization. It describes specific tools developed within two IST projects aiming at such flexible transceiver architectures. Finally, a specific example of a mode-selection algorithmic architecture is presented which incorporates all the proposed tools and, therefore, illustrates a baseband flexibility mechanism.


  • flexible radio
  • reconfigurable transceivers
  • adaptivity
  • MIMO
  • OFDM

Authors’ Affiliations

Institute of Accelerating Systems & Applications (IASA), National Kapodistrian University of Athens (NKUA), P.O. Box 17214, Athens, 10024, Greece


© Ioannis Dagres et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.