Networked and Embedded Systems Laboratory

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Software Defined Radios are becoming more and more
prevalent. Especially in the radio amateur community,
Software Defined Radios are a big success. The wireless
industry also has considerable interest in the dynamic
reconfigurability and other advantages of Software Defined
Radios. Our research focuses on the latency of Software
Defined Radios and its impact on throughput in modern
wireless protocols. Software Defined Radio systems often
employ a bus system to transfer the samples from a radio
frontend to the processor which introduces a non-negligible
latency. Additionally, the signal processing calculations on
general-purpose processors introduce additional latencies
that are not found on conventional radios. This work
concentrates on one particular Software Defined Radio
system called GNU Radio, an open source Software
Defined Radio application, and one of its hardware
components, the Universal Software Radio Peripheral
(USRP), and analyzes its receive and transmit latencies. We
will use these measurements to characterize the
performance impact on IEEE 802.15.4 implementation in
GNU Radio. Additionally, we present two Software
Defined Radio implementations of short-range radio
standards, a FSK scheme used in the Chipcon CC1000
radio, and the physical layer of IEEE 802.15.4. We use
these implementations for round trip time measurements
and introduce two sample applications, a physical layer
bridge between the FSK scheme and IEEE 802.15.4, and a
dual channel receiver that receives two radio channels
concurrently.

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