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MIMO broadcasting for simultaneous wireless information and power transfer
- IEEE Trans. Wirless Commun
, 2013
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Wireless Information Transfer with Opportunistic Energy Harvesting
- Wireless Communications, IEEE Transactions on
, 2013
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Categorical Decision Making by People, Committees, and Crowds
"... Abstract—Choosing among alternatives is a basic decision problem faced by people in all aspects of life, whether individually or collectively. Results in cognitive science suggest that people perform approximately Bayes-optimal decision making but that cognitive limitations require the coarse catego ..."
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Cited by 7 (6 self)
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Abstract—Choosing among alternatives is a basic decision problem faced by people in all aspects of life, whether individually or collectively. Results in cognitive science suggest that people perform approximately Bayes-optimal decision making but that cognitive limitations require the coarse categorization of ensembles of problems rather than the application of optimal decision rules on a problem-by-problem basis. These observations motivate the development of a mathematical theory for Bayesian hypothesis testing with quantized prior information. This paper reviews recent results in minimum Bayes risk quantizer design and its economic implications. In the context of individual decision making, the theory explains differentials in false alarm and missed detection error rates for majority and minority subpopulations without appealing to a taste for discrimination. In group decision making by majority vote, quantizer design becomes a strategic form game. Nash equilibria are guaranteed to exist but often are not Pareto optimal. The analysis reveals precise senses in which a team of agents performs best when it is diverse and shares common goals. Finally, the implications of the theory for crowdsourcing are discussed. I.
An Information-Theoretic Characterization of Channels That Die
"... Abstract—Given the possibility of communication systems failing catastrophically, we investigate limits to communicating over channels that fail at random times. These channels are finite-state semi-Markov channels. We show that communication with arbitrarily small probability of error is not possib ..."
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Cited by 2 (0 self)
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Abstract—Given the possibility of communication systems failing catastrophically, we investigate limits to communicating over channels that fail at random times. These channels are finite-state semi-Markov channels. We show that communication with arbitrarily small probability of error is not possible. Making use of results in finite blocklength channel coding, we determine sequences of blocklengths that optimize transmission volume communicated at fixed maximum message error probabilities. We provide a partial ordering of communication channels. A dynamic programming formulation is used to show the structural result that channel state feedback does not improve performance. Index Terms—Channel coding, communication channels, dynamic programming, finite blocklength regime, reliability theory. “a communication channel … might be inoperative because of an amplifier failure, a broken or cut telephone wire,…” —I. M. Jacobs
2 Digital Pulse Processing
, 2012
"... This thesis develops an exact approach for processing pulse signals from an integrate-and-fire system directly in the time-domain. Processing is deterministic and built from simple asynchronous finite-state machines that can perform general piecewise-linear operations. The pulses can then be convert ..."
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This thesis develops an exact approach for processing pulse signals from an integrate-and-fire system directly in the time-domain. Processing is deterministic and built from simple asynchronous finite-state machines that can perform general piecewise-linear operations. The pulses can then be converted back into an analog or fixed-point dig-ital representation through a filter-based reconstruction. Integrate-and-fire is shown to be equivalent to the first-order sigma-delta modulation used in oversampled noise-shaping converters. The encoder circuits are well known and have simple construction using both current and next-generation technologies. Processing in the pulse-domain provides many benefits including: lower area and power consumption, error toler-ance, signal serialization and simple conversion for mixed-signal applications. To study these systems, discrete-event simulation software and an FPGA hardware plat-form are developed. Many applications of pulse-processing are explored including filtering and signal processing, solving differential equations, optimization, the min-sum / Viterbi algorithm, and the decoding of low-density parity-check codes (LDPC).
Recommended Citation
, 2014
"... This dissertation is an in-depth case study of NATO advisors and their perceived influence in Afghanistan (2009-2012). It explores the two-part question, how do foreign security actors (ministerial advisors and security force trainers, advisors, and commanders) attempt to influence their host-nation ..."
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This dissertation is an in-depth case study of NATO advisors and their perceived influence in Afghanistan (2009-2012). It explores the two-part question, how do foreign security actors (ministerial advisors and security force trainers, advisors, and commanders) attempt to influence their host-nation partners and what are their perceptions of these approaches on changes in local capacity, values, and security governance norms? I argue that security sector reform (SSR) programs in fragile states lack an explicit theory of change that specifies how reform occurs. From this view, I theorize internationally led SSR as “guided institutional transfer, ” grounded in rationalist and social constructivist explanations of convergence, diffusion, and socialization processes. Responding to calls for greater depth and emphasis on interactions and institutional change in SSR research, I examine NATO’s efforts in Afghanistan as an extreme case of SSR in which external-internal interactions were the highest. A stratified, purposive sample of 68 military and civilian elites (24 ministerial advisors, 27 embedded field advisors and commanders, and 17 experts and external observers) participated in a confidential, semi-structured interview.
Distributed Inference Networks with Costly Wires
"... Abstract-Distributed control systems are physical constructs, incurring deployment and maintenance costs for their communication infrastructure. Inference is a central function of many distributed control systems. This paper formulates and studies the tradeoff between algebraic notions of inference ..."
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Abstract-Distributed control systems are physical constructs, incurring deployment and maintenance costs for their communication infrastructure. Inference is a central function of many distributed control systems. This paper formulates and studies the tradeoff between algebraic notions of inference functionality and algebraic notions of wiring costs. It is shown that separated topology design and node placement yields optimal network design. This design problem is shown to be NP-complete, but is carried out for small network size. A natural relaxation is shown to be a reverse convex minimization problem.
