Abstract
We provide a brief overview over the development of software-defined or reconfigurable radio systems. The need for software-defined radios is underlined and the most important notions used for such reconfigurable transceivers are thoroughly defined. The role of standards in radio development is emphasized and the usage of transmission mode parameters in the construction of software-defined radios is described. The software communications architecture is introduced as an example for a framework that allows an object-oriented development of software-defined radios. Cognitive radios are introduced as the next step in radio systems' evolution. The need for cognitive radios is exemplified by a comparison of present and advanced spectrum management strategies.
Highlights
Reconfigurability in radio development is not such a new technique as one might think
One remark concerning the relation between software radio (SR) and software-defined radio (SDR) is necessary at this point: it is often argued that an SDR is a presently realizable version of an SR since state-of-the-art analog-to-digital (A/D) converters that can be employed in SRs are not available today
Standardization of a transmission mode is necessary to ensure its success on the market
Summary
Reconfigurability in radio development is not such a new technique as one might think. One remark concerning the relation between SRs and SDRs is necessary at this point: it is often argued that an SDR is a presently realizable version of an SR since state-of-the-art analog-to-digital (A/D) converters that can be employed in SRs are not available today This argument, it is correct, may lead to the completely wrong conclusion that an SR which directly digitizes the antenna output should be a major goal of future developments. Such a configuration, called a parameter-controlled (PaC) SDR, guarantees that the transmission can be changed instantaneously if necessary (e.g., for interstandard handover).
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