Cognitive Radio Architectures

Bodhisatwa Sadhu, Ramesh Harjani

Research output: Chapter in Book/Report/Conference proceedingChapter


The system architecture for the SDR analog/RF is significantly different from that of traditional narrowband radio systems. In the original software radio proposal by Joseph Mitola in 1992 [8], he proposed an architecture where in the receiver,the RF bandwidth is digitized (no down-conversion), and signal analysis and demodulation is performed in the digital domain. Similarly, in the transmitter, the RF signal is synthesized in the digital domain, converted to analog and transmitted. The conceptual transceiver architecture is shown in Fig. 2.1. The Mitola architecture provides the maximum amount of flexibility through an increase in software capability. However, this architecture imposes impractical requirements on the analog-to-digital and digital-to-analog converters necessary for this architecture. For example, as discussed in [9], a 12 GHz, 12-bit ADC that might be used in a Mitola receiver would dissipate 500W of power! As a result, the ideal goal of communication at any desirable frequency, bandwidth, modulation and data rate by simply invoking the appropriate software remains far from realizable.

Original languageEnglish (US)
Title of host publicationAnalog Circuits and Signal Processing
Number of pages13
StatePublished - 2014

Publication series

NameAnalog Circuits and Signal Processing
ISSN (Print)1872-082X
ISSN (Electronic)2197-1854

Bibliographical note

Publisher Copyright:
© 2014, Springer Science+Business Media New York.


  • Cognitive Radio
  • Desired Frequency
  • Digital Domain
  • Joseph Mitola
  • Radio Architecture

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