Location-Based Downlink Transmission Scheme for IRS-Aided Integrated Satellite-Terrestrial Networks

被引:3
作者
Liu, Xiaoyu [1 ]
Lin, Min [1 ]
Tan, Miaomiao [1 ]
Guo, Huaibo [1 ]
Ouyang, Jian [1 ]
Quek, Tony Q. S. [2 ,3 ]
机构
[1] Nanjing Univ Posts & Telecommun, Coll Telecommun & Informat Engn, Nanjing 210003, Peoples R China
[2] Singapore Univ Technol & Design, Informat Syst Technol & Design ISTD, Somapah, Singapore 487372, Singapore
[3] Yonsei Univ, Yonsei Frontier Lab, Seoul 03722, South Korea
关键词
Integrated satellite-terrestrial networks; intelligent reflecting surface; location information; non-orthogonal multiple access; RECONFIGURABLE INTELLIGENT SURFACES; NOMA;
D O I
10.1109/TCOMM.2023.3330873
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper investigates a location-based downlink transmission scheme to provide diverse services for different users in an integrated satellite-terrestrial network (ISTN). Specifically, the satellite network employs multicast communication to disseminate information to multiple satellite users, while the terrestrial network incorporates non-orthogonal multiple access (NOMA) with intelligent reflecting surface (IRS) technology to serve terrestrial users. Given that the location information-based channel state information (LoI-CSI) of each user is available, we formulate an optimization problem to minimize the outage probability (OP) of the terrestrial network by optimizing the transmit power and beamforming (BF) weight vector at the base station, the IRS phase shift vector, and the power allocation factor, while meeting the quality-of-service (QoS) requirement of the satellite network. To make the optimization problem tractable, we first propose a low-complexity BF algorithm based on the LoI-CSI, which simplifies the optimization problem while guaranteeing the QoS requirement of the satellite network. Then, assuming that terrestrial links experience Rician fading, we derive an approximate yet accurate OP of the terrestrial network, which is explored to calculate the phase shift vector. Furthermore, we propose a novel power allocation method that employs an exponential-type approximation of the first-order Marcum Q-function, to obtain the power allocation coefficient. Finally, simulation results confirm the theoretical formulas' validity and reveal the proposed algorithms' superiority in system performance.
引用
收藏
页码:1090 / 1104
页数:15
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