Fading broadcast channels have been studied extensively over the past 30 years and the Shannon capacity of these channels is well established. This paper examines the Shannon capacity of two-user fading broadcast channel using superposition coding and assuming perfect channel information at both the receiver and transmitter with the additional constraint of maintaining minimum data rates for bo...

A use-or-lose provision requires firms to employ a certain minimum fraction of their productive capacity. Variants have been used by regulators in the airline, natural gas transmission, and electric power industries, among others. The primary objective of these provisions is to limit capacity hoarding. We examine the welfare implications of imposing a use-or-lose provision on firms that are abl...

The additive exponential noise channel with additive exponential interference (AENC-AEI) known non-causally at the transmitter is studied. This channel can be considered as an exponential version of the discrete memoryless channel with state known non-causally at the encoder considered by Gelfand and Pinsker. We make use of Gelf’and-Pinsker’s classic capacity Theorem to derive inner and outer b...

This work focuses on improving the Hop eld network for solv ing optimization problems Although much work has been done in this area the performance of the Hop eld network is still not satisfactory in terms of valid convergence and quality of solutions We address this issue in this work by combing a new activation function EBA and a new relax ation procedure CR in order to improve the performanc...

Bichromatic reverse nearest neighbor (BRNN) based query uses the number of reverse nearest customers to model the influence of a facility location. The query has great potential for real life applications and receives considerable attentions from spatial database studies. In real world, facilities are inevitably constrained by designed capacities. When the needs of service increase, facilities ...

This paper explores a spectrally efficient, variable rate transmission scheme under a service outage constraint for a block fading channel model. The service outage constraint is motivated by real time variable rate applications. In a service outage, the transmission code rate is below a given basic rate and may in fact be zero. Unlike an information outage in the capacity versus outage problem...

Capacity analysis in wireless communication systems is essential for system design, call admission control and radio resource allocation. Since CDMA is a kind of powerconstrained or interference-limited system, its system capacity is not so “hard” as in bandwidth-limited systems, such as TDMAbased systems. In this paper, we analyze the uplink and downlink capacity of multimedia DS-CDMA systems ...

We present a novel local optimum based power allocation approach for spectrum sharing in unlicensed frequency bands. The proposed technique is based on the idea of dividing the network in a number of smaller sub-networks or clusters. Sum capacity of each cluster is maximized subject to constraint on total power of each user in a cluster. On its turn each user in a cluster maximizes the sum capa...

Abstruct-The capacity C(p,, p p ) of the discrete-time quadrature additive Gaussian channel (QAGC) with inputs subjected to (normalized) average and peak power constraints, pa and pp respectively, is considered. By generalizing Smith’s results for the scalar average and peak-power-constrained Gaussian channel, it is shown that the capacity achieving distribution is discrete in amplitude (envelo...

In this paper we test the idea that hedge funds‟ capacity constraints may play a significant role on the decision of fund families to open a new hedge fund. Our empirical analysis shows that fund families‟ propensity to open new funds increases with degree of capacity constraint faced by existing funds of the families. We argue that hedge fund families face diseconomies of scale because of the ...