An analysis for predictor antenna system on a moving vehicle.

What is it about?

It is about the predictor antenna systems on a vehicle like trains, trams, or buses. In these systems, the front antenna --known as the predictor antenna-- can be used to sample the channel, and feedback the channel state information back to the base station antenna. A few moments later, the base station antenna can use this information to communicate with the rear receive antenna which --as the vehicle moves forward-- will be arriving at the same position as the predictor antenna was a few moments earlier. The paper investigates the impact of the coupling and change of vehicle velocity on the performance of such system.

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Why is it important?

A general formula is introduced in this paper which can be used to quantify the reliability of predictor antenna system in any rich multipath scenario. The vehicle's velocity, the separation between the predictor antenna and the receiver antenna, non-uniform angle of arrivals, uncorrelated or correlated incoming waves of balanced or imbalanced polarisations are all included in this formulation. Furthermore, using open-circuit decoupling method is well known to decouple two coupled antennas. This decoupling method relies on input network parameters. We disclose the dependency of this method on input network parameters.