This paper studies the e¤ects of capacity utilization on accounting pro…t margins and stock returns. Since accounting pro…t margins represent the average pro…t per unit and not the economists’ concept of unit contribution margin, the marginal/variable pro…t per unit, a …rm with idle capacity can increase its pro…t margins by increasing sales (output). However, if the …rm is operating at full ca...

A closed-form expression for the capacity of an array of correlated Gaussian channels is derived. It is shown that when signal and noise are independent, the array of observables can be replaced with a single observable without diminishing the capacity of the array channel. Examples are provided to illustrate the dependence of channel capacity on noise correlation for twoand three-channel arrays.

A transmitter and receiver need to be designed to guarantee reliable communication on any channel belonging to a given family of finite-state channels defined over common finite input, output, and state alphabets. Both the transmitter and receiver are assumed to be ignorant of the channel over which transmission is carried out and also ignorant of its initial state. For this scenario we derive ...

Recommended by Dimitrios Tzovaras Explicit expressions are derived for the channel capacity of multiantenna systems with the Nakagami fading channel.

A multiple access channel and a point-to-point channel sharing the same medium for communications are considered. We obtain an outer bound for the capacity region of this setup, and we show that this outer bound is achievable in some cases. These cases are mainly when interference is strong or very strong. A sum capacity upper bound is also obtained, which is nearly tight if the interference po...

This paper considers error probabilities of random codes for memoryless channels in the fixed-rate regime. Random coding is a fundamental scheme to achieve the channel capacity and many studies have been conducted for the asymptotics of the decoding error probability. Gallager derived the exact asymptotics (that is, a bound with asymptotically vanishing relative error) of the error probability ...

With the advent of more and more sophisticated applications for mobile users, high rate-demanding services and new habits of subscribers, wireless communications system designers are confronted to new challenges: providing ubiquitous availability, improving energy efficiency, enhancing system capacity and guaranteeing security. As some of these aspects cannot be simultaneously optimized in conv...

Ethernet is the most widely used network and many analytical models were developed to predict its capacity. Usually in these models assumptions like infinite population, no back-off algorithm and slotted channel are made. By comparing two models (one slotted and the other non-slotted) with reported measurements, we showed the optimistic estimate of the channel capacity of the slotted model is n...

We present an overview of physical and mediumaccess-control (MAC) layer research for communication and localization in ultra-wideband (UWB) sensor networks for industrial applications, and provide a summary of our results obtained under the umbrella of the EU Integrated Project PULSERS. The focus of our work is on fundamental questions about UWB channel modeling, UWB channel capacity, efficient...