Codificação na presença do valor semântico da informação

Abstract

Classical theorical framework for communication assumes that all information is equally important. With such uniformity assumption, reliability of a communication scheme is measured by the average probability of error over all possible messages to be transmitted. In this work we explore possibilities for coding when information has different semantic values. We introduce a loss function that expresses the overall performance of a coding scheme for discrete channels and exchange the usual goal of minimizing the probability of error to that of minimizing the expected loss. In this environment we explore the possibilities of using poset decoders to make a message-wise unequal error protection, where the most valuable information is protected by placing in its proximity information words that differ by small valued information. Similar definitions and results are shortly presented also for signal constellations in Euclidean space