Networked and Embedded Systems Laboratory

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Software Defined Radios can provide significant benefits as backend
gateways or base stations for sensor networks, which do not face the
stringent resource constraints of in-network nodes. We extended GNU
Radio with two physical layer implementations of IEEE 802.15.4 and an
FSK modulation, and use the Universal Software Radio Peripheral (USRP)
to interoperate with the Chipcon CC1000 and CC2420 radios found on the
popular Mica2, MicaZ and Telos B motes. The wideband nature of the
USRP makes it feasible for a single SDR base station to simultaneously
communicate on multiple independent channels, and provide network
bridging across incompatible radio standards. The demo will show a
software defined radio base station talking simultaniously to Mica2
and MicaZ nodes and will relay messages coming from the Mica2 to the
MicaZ, and vice versa. Additionally, we will present a unified design
and modeling environment for Software Defined Radio systems, which
aims to bridge the diverse set of design abstractions and software
tools used by engineers specializing in communication, networking, and
embedded systems. Our environment extends Berkeley's Ptolemy II, a
heterogeneous modeling and simulation environment, which provides an
overall framework and graphical interface. We provide a Ptolemy
interface to GNU Radio for physical layer design, and the Click
modular router from MIT, for network level design. This approach
allows designers to work at their preferred design abstraction, while
permitting integrated system modeling, access to rich libraries of
existing system components, and efficient code generation for
implementation on real targets.

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