RELIABLE BEAM TRACKING ON HIGH-ALTITUDE PLATFORM FOR MILLIMETER WAVE HIGH-SPEED RAILWAY
Owing to the dominant line-of-sight (LOS) component of high-altitude platform (HAP) communications, tracking the high-speed railway (HSR) uplink channel is commonly performed by forming received beam based on the estimated direction-of-arrival (DOA) of the LOS path. Although DOA estimation accura...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/76201 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Owing to the dominant line-of-sight (LOS) component of high-altitude platform
(HAP) communications, tracking the high-speed railway (HSR) uplink channel
is commonly performed by forming received beam based on the estimated
direction-of-arrival (DOA) of the LOS path. Although DOA estimation accuracy
is increased by using smaller angle resolution, but the DOA-based beam tracking
is not computationally efficient when large antenna array size is involved, as
recognized in mmWave communications. Moreover, maintaining link reliability
becomes very challenging since beam misalignments arises frequently due to the
high-speed user. In this paper, we propose a learning-based framework aiming to
achieve reliable connectivity for HSR data transmission using HAP infrastructure
employing uniform planar array (UPA) antenna configuration. Specifically, we
employ the mulit-armed bandit (MAB) beam tracking, which is carried out in
between two initial access (IA) phases of the fifth generation (5G) radio frame and
follows the existing modify exponential weight (EXP3) algorithm. The proposed
scheme results in outage probability approaching that of the DOA-based scheme but
with complexity which only scales linearly with the codebook size and independent
on the number of antenna elements. Furthermore, performing beam tracking
prolongs the interval between two IA phases yet with negligible deterioration in
outage performance which translates to more room available for data transmission. |
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