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The digital domain allows for much easier recovery of information from coherent systems. Even though radio channels are noisy and fading and difficult to work with, information can be recovered using approximation.
Currently, a two-USRP GNURadio setup is being used, with either differential 8-PSK or straight 8- or 16-QAM.
What Steve is doing this week: * Reading about how DSSS works, used in 802.11b,g to spread the signal in frequency. Open questions are:
* Assuming that QAM on GNU Radio is dead, unless a better AGC/phase error calculator works magically, given that we'll have WARP radios soon.