-In this article, two efficient heuristic algorithms are suggested for the channel allocation problem which minimizes the average blocking probability of the whole network subject to the co-ebannel, adjacent-site and co-site interference constraints, given the number of available channels. We convert this problem into a convenient form using the piecewise linearization technique and the concept...

This paper proposes a new algorithm using a nonpositive neural network model to solve channel assignment problems in arbitrary cellular mobile radio systems. Unlike traditional neural nets used in optimization problems, the proposed network is guaranteed to deliver valid solutions after every update and needs no parameter tuning. The power of the new method to solve this NP-complete problem wil...

The primary goal of cellular radio systems is to provide communications services to a large number of mobile users. Due to the dramatic increase of this market, the available resources have to be utilized efficiently. Closedloop power control is considered as an important component in these resource management algorithms. Here, relevant aspects on power control are discussed, using an automatic...

FUTURE TRENDS OF MOBILE AND PERSONAL COMMUNICATIONS (Invited Paper) Theodore S. Rappaport Mobile & Portable Radio Research Group Bradley Department of Electrical Engineering Virginia Tech Blacksburg, VA 24061-0350 email: [email protected] This tutorial paper provides an overview of the fundamental concepts used in cellular radio communications, and illustrates the likely evolution and growth of t...

Modern train control systems rely on a dedicated radio network for train to ground communications. A number of possible alternatives have been analysed to adopt the European Rail Traffic Management System/European Train Control System (ERTMS/ETCS) control system on local/regional lines to improve transport capacity. Among them, a communication system based on public networks (cellular&satellite...

The problem to track time-varying parameters in cellular radio systems is studied. The focus is on estimation based only on the signals that are readily available. Previous work have demonstrated very good performance relying on analog measurement. In a real system most of the information is lost due to quantization and sampling at a rate that might be as low as 2 Hz (GSM case). Therefore a dif...

In recent years, the cellular spectrum has become very crowded due to the tremendous success of mobile communications. However, a large portion of the electromagnetic spectrum assigned to other services is used sporadically only. A first step towards cognitive radio can be implemented in LTE-advanced networks by sensing the available frequencies and exploiting the existing radio spectrumopportu...

For wireless communication systems, iterative power control algorithms have been proposed to minimize transmitter powers while maintaining reliable communication between mobiles and base stations. To derive deterministic convergence results, these algorithms require perfect measurements of one or more of the following parameters: 1) the mobile’s signalto-interference ratio (SIR) at the receiver...

This paper deals with the automatic selection and configuration of base station sites for mobile cellular networks. An optimization framework based on simulated annealing is used for site selection and for base-station configuration. Realistic path-loss estimates incorporating terrain data are used. The configuration of each base station involves selecting antenna type, power control, azimuth, ...

This invited lecture was presented at the Extension Division of the University of W isconsin at a time when cellular telephone (hence the somewhat obsolete wording of the title) had not yet reached its wide acceptance, but system designers were rightfully concerned with surge protection of that emerging technology. One particular aspect of a cell phone relay tower is that it is often installed ...