TY - JOUR
T1 - Sum-Rate Analysis for High Altitude Platform (HAP) Drones with Tethered Balloon Relay
AU - Sudheesh, P. G.
AU - Mozaffari, Mohammad
AU - Magarini, Maurizio
AU - Saad, Walid
AU - Muthuchidambaranathan, P.
N1 - Funding Information:
Manuscript received November 30, 2017; accepted December 13, 2017. Date of publication December 21, 2017; date of current version June 8, 2018. This work was supported by the Army Research Office (ARO) under Grant W911NF-17-1-0593 and, in part, by the US NSF under Grant AST-1506297. The associate editor coordinating the review of this paper and approving it for publication was C. Masouros. (Corresponding author: Mohammad Mozaffari.) P. G. Sudheesh and P. Muthuchidambaranathan are with the Department of Electronics and Communication Engineering, National Institute of Technology, Tiruchirappalli 620015, India (e-mails: pgsudheesh@gmail.com; muthuc@nitt.edu).
Publisher Copyright:
© 1997-2012 IEEE.
PY - 2018/6
Y1 - 2018/6
N2 - High altitude platform (HAP) drones can provide broadband wireless connectivity to ground users in rural areas by establishing line-of-sight links and exploiting effective beamforming techniques. However, at high altitudes, acquiring the channel state information (CSI) for HAPs, which is a key requirement to perform beamforming, is challenging. In this paper, by exploiting an interference alignment (IA) technique, a novel method for achieving the maximum sum-rate in HAP-based communications without CSI is proposed. In particular, to realize IA, a multiple-antenna tethered balloon is used as a relay between multiple HAP drones and ground stations (GSs). Here, a multiple-input multiple-output X network system is considered. The capacity of the considered M × N X network with a tethered balloon relay is derived in closed-form. Simulation results corroborate the theoretical findings and show that the proposed approach yields the maximum sum-rate in multiple HAPs-GSs communications in absence of CSI. The results also show the existence of an optimal balloon's altitude for which the sum-rate is maximized.
AB - High altitude platform (HAP) drones can provide broadband wireless connectivity to ground users in rural areas by establishing line-of-sight links and exploiting effective beamforming techniques. However, at high altitudes, acquiring the channel state information (CSI) for HAPs, which is a key requirement to perform beamforming, is challenging. In this paper, by exploiting an interference alignment (IA) technique, a novel method for achieving the maximum sum-rate in HAP-based communications without CSI is proposed. In particular, to realize IA, a multiple-antenna tethered balloon is used as a relay between multiple HAP drones and ground stations (GSs). Here, a multiple-input multiple-output X network system is considered. The capacity of the considered M × N X network with a tethered balloon relay is derived in closed-form. Simulation results corroborate the theoretical findings and show that the proposed approach yields the maximum sum-rate in multiple HAPs-GSs communications in absence of CSI. The results also show the existence of an optimal balloon's altitude for which the sum-rate is maximized.
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U2 - 10.1109/LCOMM.2017.2785847
DO - 10.1109/LCOMM.2017.2785847
M3 - Article
AN - SCOPUS:85039792857
SN - 1089-7798
VL - 22
SP - 1240
EP - 1243
JO - IEEE Communications Letters
JF - IEEE Communications Letters
IS - 6
ER -