Brian P. Dunn

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We discuss implementation aspects of a software-defined radio system that allows for dynamic waveform reconfiguration during runtime without interrupting data-flow processing. Traditional software-defined radio systems execute a waveform statically, exactly as it is programmed. Reconfiguration is provided by executing a different waveform, which requires(More)
— We discuss a developing software-defined radio framework and kernel, Surfer, which, among other changes compared with known current frameworks , moves control of when to process a block and how much data to process into the blocks themselves via buffer thresholds. Varying threshold values shows a trade-off between data processing latency and through-put,(More)
We investigate the amount of protocol information required for a communication network to meet an average delay constraint for the delivery of messages that arrive according to a Bernoulli random process. We obtain a lower bound on this overhead as a function of the arrival rate and average delay. Our model is a discretetime analog of the Poisson arrival(More)
We investigate the idea of providing information-theoretic security at the network and data link layers by exploiting the timing information resulting from queuing of packets between a source, an intended receiver, and other users in a network. Specifically, we consider the secure transmission of messages by encoding them onto the interarrival timing of(More)
This paper speculates on a perspective for studying overhead in communication systems that contrasts the traditional viewpoint that overhead is the “non-data” portion of transmissions. By viewing overhead as the cost of constraints imposed on a system, information-theoretic techniques can be used to obtain fundamental limits on overhead(More)
—We consider the protocol overhead of meeting an expected delay constraint in sending a bursty source over a binary erasure channel with feedback. In contrast to related work on stability and delay for medium-access control, we focus on physical layer aspects of the problem by jointly considering queuing and message encoding for transmission over the(More)
We summarize the design and implementation of a portable software radio prototype built primarily using commercial off-the-shelf components and open-source software. The device components include a general-purpose processor (GPP) on a small-form-factor motherboard, radio hardware, touchscreen and LCD, audio microphone and speaker, and an internal battery(More)
The goals of this demonstration are twofold. First, the demonstration seeks to provide an easy visualization of the effects multipath fading has on a wireless link and the benefits that cooperative communications can offer in mitigating this channel impairment. It does so by offering visual display of channel quality and receiver statistics. Second, it(More)
by Brian P. Dunn Real-time multimedia communication over a wireless link presents many challenges that require non-traditional methods to ensure good performance. A strict delay constraint prevents averaging over variations in the channel's fading coefficient , resulting in a channel with zero capacity in the Shannon sense. Without knowledge of the channel(More)