Power Allocation in HARQ-based Predictor Antenna Systems
Journal article, 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.

moving backhaul

power allocation

outage probability

predictor antenna

Channel state information

mobile relay

Author

Hao Guo

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Behrooz Makki

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Mohamed-Slim Alouini

Tommy Svensson

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

IEEE Wireless Communications Letters

2162-2337 (ISSN)

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/LWC.2020.3010579

More information

Latest update

7/23/2020