Future wireless systems of the fourth generation (4G) aim to support a wide variety of services over a wide variety of networks in a way transparent to the user. Software-defined radio (SDR) terminals are crucial to enable seamless and transparent inter-working between these different wireless access systems or communication modes. On the longer term, SDRs will be extended to become cognitive radios coupling energy savings to efficient spectrum usage.

The SDR ‘flexible air interface’ (FLAI) project targets to deliver software defined radio (SDR) baseband solutions for nomadic terminals, with a cost-and-power- efficient integrated architecture supporting all radio standards from CDMA (3GPP-LTE) up-to the most demanding OFDM based communication standards (802.11n, 802.16e, DVB-H).