Power Allocation in HARQ-based Predictor Antenna Systems
Artikel i vetenskaplig tidskrift, 2020

In this work, we study the performance of predictor antenna (PA) systems using hybrid automatic repeat request (HARQ). Here, the PA system is referred to as a system with two sets of antennas on the roof of a vehicle. In this setup, the PA positioned in the front of the vehicle can be used to predict the channel state information at the transmitter (CSIT) for the receive antenna (RA) that is aligned behind the PA. Considering spatial mismatch due to mobility, we derive closed-form expressions for the optimal power allocation and the minimum average power of PA systems under different outage probability constraints. The results are presented for different types of HARQ protocols and we study the effect of different parameters on the performance of PA systems. As we show, our proposed approximation scheme enables us to analyze PA systems with high accuracy. Moreover, for different vehicle speeds, we show that HARQ-based feedback can reduce the outage-limited power consumption of PA systems by orders of magnitude.

Channel state information

power allocation

predictor antenna

outage probability

moving backhaul

mobile relay


Hao Guo

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Behrooz Makki

Ericsson AB

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

Mohamed-Slim Alouini

King Abdullah University of Science and Technology (KAUST)

Tommy Svensson

Chalmers, Elektroteknik, Kommunikation, Antenner och Optiska Nätverk

IEEE Wireless Communications Letters

2162-2337 (ISSN) 2162-2345 (eISSN)

Vol. 9 12 2025-2029 9144521

Integrated Antenna Arrays

Saab, 2016-01-01 -- 2023-12-29.

Ericsson AB, 2016-01-01 -- 2023-12-29.

United Monolithic Semiconductors (UMS), 2016-01-01 -- 2023-12-29.

Kongsberg kommune, 2016-01-01 -- 2023-12-29.

Gapwaves AB, 2016-01-01 -- 2023-12-29.

VINNOVA, 2016-01-01 -- 2021-12-31.


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