Design of software defined down-conversion and up-conversion: an overview
Yue Zhang, Li-Ke Huang, Carsten R. Maple, Qing Xuan · University of Bedfordshire Repository (University of Bedfordshire) · 2011
In recent years, much attention has been paid to software-defined radio (SDR) technologies for multimode wireless systems. SDR can be defined as a radio communication system that uses software to modulate and demodulate radio signals. This article describes concepts, theory, and design principles for SDR down-conversion and up-conversion. Design issues in SDR down-conversion are discussed, and two different architectures, super-heterodyne and direct-conversion, are proposed. Design issues in SDR up-conversion are also discussed, and trade-offs in the design of filters, mixers, NCO, DAC, and signal processing are highlighted.