Journal
IEEE COMMUNICATIONS LETTERS
Volume 24, Issue 5, Pages 1100-1104Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2020.2971701
Keywords
Array signal processing; Massive MIMO; Interference; Wireless communication; Antenna arrays; Precoding; Hybrid beamforming; massive MIMO; unmanned aerial vehicle
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20190012]
- NSFC [61871109, 61941115]
- F.R.S.-FNRS [30452698]
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In this letter, we consider hybrid beamforming for unmanned aerial vehicle (UAV)-assisted communications with massive multiple-input multiple-output (MIMO). Using a hybrid beamforming design, we derive an approximate closed-form expression of rate and provide a power allocation design under the line-of-sight (LoS) channels. It is revealed that the total transmit power should be inversely proportional to the number of antennas of UAV in order to satisfy the rate requirement of each user. Furthermore, we propose the optimal location design of the UAV. For the special case the pathloss exponent is 2, the optimal location is the weighted average location of all users where the weights are signal to interference plus noise ratio (SINR) requirements of all users. It is shown that the weighted average location could be an approximate method to design the UAV location with little performance gap to the optimal location even when path loss exponent is not 2.
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