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Using "Predictor Antennas" for Long-Range Prediction
of Fast Fading for Moving Relays.
Mikael Sternad
, Uppsala University,
Michael Grieger
, TU Dresden,
Rikke Apelfröjd
, Uppsala University,
Tommy Svensson
, Chalmers,
Daniel Aronsson
, Uppsala University, and
Ana Belén Martinez
, TU Dresden.
IEEE Wireless Communications and Networking Conference (WCNC),
4G Mobile Radio Access Networks Workshop
, Paris, April 2012.
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Abstract:
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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.
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Related publications:
- WSA 2018 paper verifying
with measurements that predictor antennas enable precise
precoding for massive MIMO antennas in non-line-of sigth.
- Paper in IEEE ICC 2017
on statistical performance results when using the predictor antennas
on a very large set of vehicular channel measurements.
- Compainon Paper in IEEE PIMRC 2017
on actual prediction results
on a very large set of vehicular channel measurements.
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Conference paper at EUCAP 2014
presenting compensation of antenna coupling
- Report by Rikke Apelfröjd
on Kalman prediction for multipoint OFDM downlink channels, May 2014.
- Channel Estimation
and Prediction for MIMO OFDM Systems.
Key design and performance aspects
of Kalman-based algorithms.
PhD Thesis by Daniel Aronsson, 2012.
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Moving Cells Communication Magazine paper, 2013.
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IEEE Intelligent Transportation Systems Magazine 2015:
Making 5G adaptive antennas work for very fast moving vehicles.
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Source:
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Pdf
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