This paper analyzes performance and throughput of an adaptive bit allocation and variable rate algorithm depending on channel state information (CSI) and a transmit power in a multi-user OFDM transmission. The purpose of the presented multi-rate OFDM system using adaptive modulation is to increase bandwidth efficiency by controlling constellation size and to adapt proper service for each user a...

This paper defines a new utility importance of a state of a component in multi-state systems. This utility importance overcomes some drawbacks of a well-known importance measure suggested by William S. Griffith (J. Applied Probability, 1980). The relationship between this new utility importance and the Griffith importance is studied and their difference is illustrated with examples. The contrib...

If computational tractability were not an issue, multi-object estimation should integrate all measurements from multiple sensors across scans. In this article, we propose efficient numerical solution to the multi-scan multi-sensor problem by computing (labeled) posterior density. Minimizing <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"...

The reliability of Multi-State System (MSS) is analysed in this paper. In a MSS, both the system and its components may experience more than two reliability states. Many practical and theoretical problems needs still to be solved in this area. One of the crucial ones is to identify how a change in a state of an individual component or changes in states of several ones affect(s) the system relia...

Abstract: This paper proposes a decision model for when to repair a multi-state system from the collective viewpoint of the system designer/engineer as well as the system users (customers). Most systems normally deteriorate stochastically over time, and have several levels of performance. This degradation of performance causes the utility loss for customers and forces them to consider repairing...

In this paper, we present a practical approach for the joint reliability–redundancy optimization of multistate series–parallel systems. In addition to determining the optimal redundancy level for each parallel subsystem, this approach also aims at finding the optimal values for the variables that affect the component state distributions in each subsystem. The key point is that technical and org...

Many real-world systems are composed of multi-state items that have different performance levels and several failure modes. Items are characterized by their cost, performance and reliability. In a multi-state system, the system and/or its items can posses more than two performance levels. Thereby, the system can have several levels of performance from perfect operation to total failure. The sys...