Digital signal processing aspects of software definable radios

Multi-standard software definable radios (SDR) which are capable of operation according to a variety of different mobile radio standards represent an extremely powerful tool for evolution towards future third-generation cellular systems. An approach based on the use of a fixed-bandwidth analogue front-end for the implementation of a wideband digital SDR receiver was introduced by Karimi and Friedrichs (see, IEE Colloquium on Adaptable and Multi-Standard Mobile Radio Terminals, 1997) and the resulting impact on analogue-to-digital converter technology investigated. This paper examines a number of the architectural issues and trade-offs involved in the design and implementation of the digital signal processing aspects of such wideband receivers in the context of multi-standard GSM/DCS/UMTS digital radios. This work has been undertaken in the context of the FIRST project (Flexible Integrated Radio System Technology) as part of the ACTS mobile domain.