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Tuning into SDR
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03/07/2008
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When handset makers start discussing designs with 11 wireless air interfaces, you know the days of current design practices are numbered. Squeezing more standard specific radios into a handset wastes die and board area and burns power. It is also inelegant; something that software defined radio is not.
Software defined radio (SDR) implies a high speed a/d converter connected directly to the antenna. Digital hardware then processes the a/d samples, implementing the radio functions in software. The result is that one platform can implement multiple radio standards; even several in parallel, given enough processing performance.
Emerging systems and chips have not embraced this classical software radio approach since such an a/d is not practical, due to the high sampling speeds and resulting power consumption. But software radios now appearing use flexible hardware to process down converted signals and implement radio functions in software.
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Author
Roy Rubenstein
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Source
Diagram courtesy of ASOCS
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