Дослідження багатошарових нейронних мереж для автоматичного виділення ознак при вирішенні задачі розпізнавання образів

В роботі розглянуто підходи до виділення ознак при розпізнаванні образів і застосування багатошарових нейронних мереж для розв'язання таких задач. Проведено процес моделювання багатошарового перцептрону для автоматичного виділення ознак зображення і подальшої класифікації. Досліджено вплив базових параметрів на якість розпізнавання.The paper deals with approaches to feature extraction in pattern recognition and application of multilayer neural nets for solving such problems. The modeling process of multilayer perceptron for automatic feature extraction and further classification is described. The basic parameters influence on quality of recognition is researched

Resource allocation and control signaling in the WINNER flexible MAC concept

Abstract—The EU WINNER projects have studied OFDM-based packet data systems beyond 3G that use adaptivity on all timescales to obtain high flexibility and performance. The adaptive transmission in both downlink and uplink is scheduled and controlled at base stations and relay nodes and requires frequent transmission of control information over the downlink. The use of scheduling, adaptive modulation and coding, with fine granularity in both time and space, could potentially result in unrealistic bandwidth demands for such downlink control signaling. The present paper describes how this problem has been handled within WINNER in two cases: Frequency-adaptive transmission, which allows individual link adaptation within time-frequency resource units and non-frequency adaptive transmission, which averages over the channel variations in the frequency domain. An important tool for limiting the associated control information is to broadcast only a small essential set of control data to all user terminals, using a safe but therefore bandwidth-demanding code rate. The remaining control information is multicast to groups of users with different signal to interference and noise ratios (SINRs). The modulation and code rates of these transmissions are adjusted to the SINRs of these groups. The over-all coded data rate of the control transmission can thereby be reduced to acceptable levels. Keywords-OFDM;IMT-Advanced; Adaptive transmission; MAC; transmission control; control overhead

EU FP6 IST-4-027756 WINNER II, D6.13.14 WINNER II System Concept Description, Dec 2007

This document contains a top-down view of the WINNER system with respect to logical node architecture, protocol architecture and cooperation architecture to give a basic understanding of the WINNER concept and as a complement to performance evaluations and design examples. The document also describes some of the important cross-layer optimizations that have been made. In addition to describing the concept, several example reference designs have been studied and are described

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