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Gnuradio guide GNU Radio A Free Software De ?ned Radio Eric Blossom eb comsec com Blossom Research Lighthouse Ave Suite Monterey CA USA CThought for the day ? The milk of disruptive innovation doesn ? t ow from cash-cows ?? David S Isenberg GNU Radio COve

GNU Radio A Free Software De ?ned Radio Eric Blossom eb comsec com Blossom Research Lighthouse Ave Suite Monterey CA USA CThought for the day ? The milk of disruptive innovation doesn ? t ow from cash-cows ?? David S Isenberg GNU Radio COverview ? Software de ?ned radio ? Free open source software ? GNU Radio ? Software ATSC receiver GNU Radio CWhat is software de ?ned radio ? Get the software close to the antenna ? Software de ?nes the waveforms ? Replace analog signal processing with digital signal processing GNU Radio CWhy SDR ? Flexibility ? Quicker time to market ? Multiple personalities chameleon ? New things are possible ?? Multiple channels at the same time ?? Better spectrum utilization ?? ??Cognitive radios ? GNU Radio CDisadvantages ? Higher power consumption than dedicated ASIC approach ? More MIPS required ? Higher cost today GNU Radio CCurrent SDR users ? Military ?? Consolidating a stack of radios ?? Bridging between radio networks ? Cellular base stations ?? Avoid ??fork lift upgrades ? ?? Multiple standards on same system ?? New features to market quicker GNU Radio CEmerging SDR uses ? Personal communication devices ?? Cellular Paging Wireless LAN s ? PC based ??generic transceiver ? ?? Radio TV ?? Emerging unlicensed RF band apps GNU Radio CWhat is ??free software ? ? ??Free as in liberty ? ?? User has access to the source ?? User is free to modify and is encouraged to contribute the modi ?cations back to the community ? A culture of innovation ? Various licenses GNU General Public License GPL Mozilla Artistic License GNU Radio CWho uses free software ? World wide community of users ? Publicly traded companies support or distribute free software IBM Red Hat Mandrake ? Linux ? Apache web server ? Not a fringe activity GNU Radio CWhat is GNU Radio ? It ? s a free software de ?ned radio ? A platform for experimenting with digital communications ? A platform for signal processing on commodity hardware GNU Radio CVision ? Transmit and receive any signal ? Create a practical environment for experimentation product delivery ? Expand the ??free software ethic ? into what were previously hardware intensive arenas GNU Radio CWhat H W is required ? Commodity PC ? RF front end e g TV tuner module ? Multi-channel applications wide B W ?? High speed A D ?? Msamples sec ? Single channel narrow bandwidth ?? SoundBlaster AC codec etc GNU Radio CSDR ATSC receiver is practical ? Commodity PC ?? Dual processor Athlon MP ?? MB RAM GB disk ?? ?? Can do ? integer ops sec ? FIR ?lter taps sec GNU Radio CATSC computational requirements ? i TSP decode takes about of a single CPU ? Na? ve equalizer about taps s ?? Smart s w version about taps s ? Viterbi decoder decisions sec ?? Highly amenable to SIMD implementation ?? Short constraint length GNU Radio CMoore ? s Law is on