In this article a method of optimizing wireless communication systems using multiple antennas is presented. This method focuses on the synthesis of antenna radiation patterns that are optimized in terms of mutual information, taking into account the specific limitations of the antenna design, such as the available space (for the antenna structure), polarization, number and arrangement of the antennas.
The tendency to increased cruising velocity of high-speed trains is unbroken, although stabilising the level already reached is dominant [ 13. In parallel the weight of the end coaches in the future train sets is decreased because of replacing the power car concept by the distributed traction concept and because of axle load limitations in the trans-European interoperability rules. This allows both for a less overall weight of the train with its reduced energy consumption effect and for an end car equipped with passenger seats, thus increasing the transport capacity of the train.As higher speed means higher aerodynamic forces which then act on vehicles with lower mass, the vehicle reaction onto unsteady air force excitation, e.g. of the end car in trailing position, have come into the view of the railway operators. In the BriteEuram-funded research project RAPIDE (Railway Aerodynamics of Passing and Interaction with Dynamic Effects) the railway undertakings Deutsche Bahn AG (DB), the French SNCF and the Italian FS, joined their forces to investigate, among other examinations, the boundary layer flow of a modem high-speed train and the wake flow characteristics by means of currently available off-the-shelf CFDcodes. Full scale measurements both with a multi-pressure probe device and a LDA-system were performed for validation purposes up to train velocities of 280 k m h ([2]).
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