Using “predictor antennas” for long-range prediction of fast fading for moving relays

Abstract

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Design and measurement-based evaluations of coherent JT CoMP: a study of precoding, user grouping and resource allocation using predicted CSI

“…However, for still longer prediction distances in space, the performance starts to deteriorate and the gains of using coherent joint transmission vanish [10]. A specialized 'predictor antenna' system for vehicles has recently been proposed to obtain accurate CSI also at very high velocities [49].…”

Transmit Power Minimization and Base Station Planning for High-Speed Trains with Multiple Moving Relays in OFDMA Systems

“…Note that accurate channel estimation can be obtained for high-speed train communications thanks to the use of the predictor antennas concept [29]- [31]. A predictor antenna is placed on the top of the train followed by one or several separate receive antennas.…”

“…We assume that accurate channel state information can be available at the transmitters, even at high-speeds, using for example the predictor antenna method described in [29]. The resource allocation algorithms proposed in Section III are applied in both access and bakchaul links using the parameters summarized in Table I.…”

Moving cells: a promising solution to boost performance for vehicular users

“…6 The scenario with an antenna or antenna array on the roof of a fast-moving bus or tram provides an opportunity as well as a challenge. One innovation is the use of a "predictor antenna" [15]. The vehicle velocity and direction would be relatively constant over the required 5 ms prediction horizon.…”

“…We would avoid the need to extrapolate in time from the measurements. Preliminary results based on measurement campaigns done in a 20 MHz orthogonal frequency-division multiplexing (OFDM) system in 2.68 GHz downlinks showed that using a predictor antenna can significantly improve the CSI feedback accuracy at a vehicular velocity [15]. A maximal normalized correlation above 0.95 was reported between the signal from the predictor antenna and the signal from the antenna behind it mounted on the vehicle roof, with antenna distances (prediction horizons) of up to three wavelengths, in both LOS and non-LOS (NLOS) conditions.…”