TY - GEN
T1 - Design and Coverage Analysis of Elliptical Cell Based Beamforming for HSR Communication Systems
AU - Liu, Ximei
AU - Qiao, Deli
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/5
Y1 - 2019/5
N2 - In this paper, beamforming design based on a novel coverage model of high-speed railway (HSR) to improve the coverage in HSR communication systems is investigated. A dedicated coverage model, where the coverage cell is ellipse rather than the traditional circular is considered. Based on the elliptical coverage cell, an optimization problem for beamforming design is formulated to maximize the percentage of rail coverage for a given railway length, which is defined as the percentage of coverage distance that the signal-to-noise ratio (SNR) exceeds a desired SNR threshold for the given railway length, subject to the equal average received power on the elliptical line constraint. Considering that the percentage of coverage can be improved by increasing the received power, the problem can be recast to maximizing the expected average received power. A semidefinite relaxation (SDR) method is developed to solve the optimization problem. Through numerical results, the proposed elliptical coverage cell based beamforming can increase the covering railway distance and reduce the transmission power consumption compared with the circular coverage cell. It is also found that the larger eccentricity of the ellipse with appropriately chosen BS location can provide further coverage distance.
AB - In this paper, beamforming design based on a novel coverage model of high-speed railway (HSR) to improve the coverage in HSR communication systems is investigated. A dedicated coverage model, where the coverage cell is ellipse rather than the traditional circular is considered. Based on the elliptical coverage cell, an optimization problem for beamforming design is formulated to maximize the percentage of rail coverage for a given railway length, which is defined as the percentage of coverage distance that the signal-to-noise ratio (SNR) exceeds a desired SNR threshold for the given railway length, subject to the equal average received power on the elliptical line constraint. Considering that the percentage of coverage can be improved by increasing the received power, the problem can be recast to maximizing the expected average received power. A semidefinite relaxation (SDR) method is developed to solve the optimization problem. Through numerical results, the proposed elliptical coverage cell based beamforming can increase the covering railway distance and reduce the transmission power consumption compared with the circular coverage cell. It is also found that the larger eccentricity of the ellipse with appropriately chosen BS location can provide further coverage distance.
UR - https://www.scopus.com/pages/publications/85070201137
U2 - 10.1109/ICC.2019.8761131
DO - 10.1109/ICC.2019.8761131
M3 - 会议稿件
AN - SCOPUS:85070201137
T3 - IEEE International Conference on Communications
BT - 2019 IEEE International Conference on Communications, ICC 2019 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2019 IEEE International Conference on Communications, ICC 2019
Y2 - 20 May 2019 through 24 May 2019
ER -