Using “Predictor Antennas” for Long-Range Prediction of Fast Fading for Moving Relays
Paper i proceeding, 2012

Channel state information at transmitters is important for advanced transmission schemes. However, feedback and transmission control delays of multiple milliseconds in LTE systems result in severe outdating of this information at vehicular velocities. Channel prediction based on extrapolation of the short-term fading is inadequate in LTE systems at vehicular velocities and high carrier frequencies. We here propose and evaluate a simple scheme which may extend the prediction horizon when used on vehicles: Use an additional antenna, a “predictor antenna”, placed in front of the transmission antennas in the direction of travel. This is of particular interest for use with moving relays: Local access points placed on e.g. buses or trams. A measurement-based study for 20 MHz downlink channels at 2.68 GHz is reported here for both line-of-sight and non-line-of-sight conditions.


Mikael Sternad

Uppsala universitet

Michael Grieger

Technische Universität Dresden

R. Apelfrojd

Uppsala universitet

Tommy Svensson

Chalmers, Signaler och system, Kommunikation, Antenner och Optiska Nätverk

Daniel Aronsson

Uppsala universitet

Ana Belen Martinez

Technische Universität Dresden

2012 IEEE Wireless Communications and Networking Conference

253-257 6215501
978-1-4673-0681-2 (ISBN)

Advanced Radio Interface Technologies for 4G Systems (ARTIST4G)

Europeiska kommissionen (EU) (EC/FP7/247223), 2010-01-01 -- 2012-06-30.


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