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Linux Powers First Handheld Software Radio
An anonymous reader writes "According to this article at LinuxDevices.com, Vanu Technology is demonstrating what it claims represents the world's first handheld 'software radio' using an iPAQ PDA running Linux at a conference in Washington DC today. Vanu apparently has implemented the signal processing functions on the iPAQ's XScale processor, and their software uses POSIX APIs to make it platform independent. Software radios implement multiple radio standards and frequency bands in software, rather than hardware. A standard iPAQ expansion pack houses the radio transceiver."
You're looking at this from the wrong level - this thing still has all the hardware to receive RF, the funky thing is that the radio demodulation/modulation et al is programmable. At the band's this is running at, it's not so interesting, but once you get up to 900MHz (and later at 2.4GHz+), you essentially have a device that can communicate with any RF device on its supported bands.
What this means (in the future, with 2.4GHz+ capable devices) is that one device (be it your PDA, mobile phone, PCMCIA card) can be a GSM phone, can be a CDMA phone, can be a 3G phone, can be a CB/commercial/police radio receiver, it could even be used for 802.11b or Bluetooth. The possibilities for software radio are mind boggling. Linux is really irrelevant in the scheme of things, it's essentially just used to bolt the stuff together - it's the underlying technology that is impressive.