Multi-mode all-digital transmitters for software defined radio applications

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Advanced wireless communication systems require multi-standard capabilities to be more ubiquitous, mobile, agile, and secure. This calls for the development of software defined radio transceivers. So far, extensive research activities have been carried out to design the RF front-end of such multi-band transceivers. This preliminary focused on the receiver design. Conversely, the transmitter side is still at the early research and development stages. Conventional transmitter RF front-end architectures are analog-based and therefore are hard to reconfigure and are prone to noise, nonlinearity and hardware impairments. A more compelling alternative is to move the design to digital domain. This collaborative research proposal aims at developing innovative all-digital RF transmitters for advanced communication systems using the latest semi-conductor GaN technology. The targeted architecture is based on switching-mode RF power amplifier that makes it possible to attain extremely high power efficiency levels and high speed digital signal processing block using pulse modulation technique. The proposed research project aims at two main objectives: