Software Defined Radios

• The Software Defined Radio Forum
• Software Defined Radios, Wikipedia
• Software Communications Architecture, Open architecture used by JTRS

Software Defined Radio Technical Conference and Product Exposition

• SDR Forum '04 papers
• SDR Forum '05 papers

Articles

Radio for the next generation cellular, Engineer Live!, 29 May 2007

Techno Concepts in Van Nuys, California developed a patented sigma delta architecture that can take an input form 1GHz to 6GHz and convert it directly to a digital baseband.