Panos N. Alevizos

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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)
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)
—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(More)
—Orthogonal modulation, for example, frequency-shift 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)