Panos N. Alevizos

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With rapid advances of scatter radio systems, the principle of reflection rather than active transmission employed by backscatter sensor networks has emerged as a potential key enabler for low-cost, large-scale and dense ubiquitous sensor networks. Despite the presence of three different unknown channel links due to the bistatic setup (i.e., carrier emitter(More)
This work offers concrete, low-complexity (small codeword length) channel coding for the bistatic scatter radio channel, complementing the uncoded setup of recent work. The theoretical design is experimentally validated with a commodity software-defined radio (SDR) reader; tag-to-reader ranges up to 134 meters are demonstrated with 13 dBm emitter power,(More)
Orthogonal modulation, for example, frequencyshift keying (FSK) or pulse-position modulation (PPM), is primarily used in relatively-low-rate communication systems that operate in the power-limited regime. Optimal noncoherent detection of orthogonally modulated signals takes the form of sequence detection and has exponential (in the sequence length)(More)
The background and development of a multicategory direct observation system, the Behavior Observation Instrument (BOI), is described. This time-sampling procedure for recording the behavior of persons is demonstrated in several treatment settings and the results applied to issues of program evaluation. Elements that have prevented direct observation from(More)