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In this paper a heuristic resource allocation algorithm for sum rate maximization is presented. We consider an orthogonal frequency division multiplexing channel with multiple antennas at the base station as well as at the mobile stations. Our algorithm uses eigen-beamforming and dirty paper coding. The user interference is estimated and the eigenvalues of the affected beams are updated. Our algorithm...
In this paper we investigate statistical properties of IP optimal subcarrier assignments in the down-link of an OFDMA cell. Essentially, we show that such subcarrier assignments do have ??hidden?? statistical properties which can be exploited to design an extremely simple assignment strategy. We investigate such statistical properties and the corresponding performance of the simple assignment rules...
Passenger counting is an important task for intelligent public transportation system??s planning and operation. However, traditional counting systems can??t identify individual passengers. The access to this additional capacity would allow collecting historical statistics on each passenger??s transportation needs, hence enabling a substantially enhanced optimization in these systems. With this purpose,...
The system capacity of a cellular wireless system consisting of a large number of fixed location base stations (BSs) and random location mobile stations (MSs) is studied. Assuming that the BSs in a multi-cell system are connected to a centralized controller which has access to channel state information (CSI), it is possible to optimize transmissions such that capacity is maximized. This paper discusses...
In wireless ad-hoc networks, where nodes are often equipped with batteries, energy is a scarce resource. Therefore, power consumption of network operations is critical and subject to optimization. One of the fundamental problems in ad-hoc networks is multicasting. In this work we consider the so-called minimum energy multicast (MEM) problem, which can be stated as a combinatorial optimization problem...
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