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...

Sometime during the last decade, the cell phone became ordinary. We now take for granted that we can call anyone, anytime and anywhere, and have moved on to ask whether such a call would be safe while driving, or socially acceptable in public places. The technology arena has also moved on-from voice to wireless information. Yet the cellular revolution is less than 20 years old, and the entire h...

$EVWUDFW-In cellular mobile radio systems, transmit beamforming can be used to reduce the interference in the downlink. In a Time Division Duplex (TDD) system with sufficiently short duplex period, the uplink channel estimation can be used to design the downlink beamformer. The purpose of this paper is to analyse the sensitivity of several transmit techniques to the channel variations between u...

This article reviews space-time modem technology for mobile radio applications. We begin with motivations for the use of space-time modems and then brieey discuss the challenges posed by wireless propagation. Next, we develop a signal model for the wireless environment. Channel estimation, equalization , and ltering techniques for space-time modems in the forward and reverse links are then disc...

One of the ways towards provision of low-cost mobile multimedia entertainment is to make possible the sharing of the wireless resources among multiple operators of different radio access technologies. Here we discuss opportunities for new system architectures enabled by sharing the resources belonging to the cellular and broadcasting systems, namely the spectrum and the infrastructure. The goal...

We consider feedback design for the integration of multi-user MIMO in cellular mobile radio systems. Feedback is given by the mobile terminals, which report beam indices referring to a set of fixed pre-coding beams and corresponding signal to signal to interference and noise ratio (SINR) for different supported spatial transmission modes. The SINR feedback is quantized with a different number o...

A mobile radio channel model is an essential prerequisite for the simulation, development and accurate testing of mobile radio systems. The European Co-operation in the Field of Scientific and Technical Research (COST) projects have a long history of research about channel models. The COST 207 project in the 1980s and in the early 1990s played an important role in the development and approval o...

The optimum resource apportionment standpoint is studied for non-real-time users CDMA (code division multiple access) overturn link. A resource apportionment standpoint of concern includes channel coding, out strectching gain control and power allocation under the conventional receive operation. The restriction in the optimization include peak transmit power of the mobile station, total receive...

Mobile network is evolving from a communication-only towards one with joint communication and radar/radio sensing (JCAS) capabilities, that we call perceptive mobile (PMN). Radio here refers to information retrieval received signals for objects of interest in the environment surrounding radio transceivers, it may go beyond functions localization, tracking, object recognition traditional radar. ...

The widespread diffusion of second generation cellular mobile radio systems, with third generation ones underway, has fostered the development of packet-based wireless services, which is going to make mobile radio networks a viable way for Internet access. Wireless LANs are also gaining popularity, with higher-speed IEEE 802.11a solutions being deployed. In the satellite environment, there is a...