Robust Downlink Precoding for LEO Satellite Systems With Per-Antenna Power Constraints

Liu, Yanhao; Wang, Yibiao; Wang, Jue; You, Li; Wang, Wenjin; Gao, Xiqi

doi:10.1109/tvt.2022.3187046

Cited by 7 publications

(3 citation statements)

References 48 publications

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“…Low earth orbit (LEO) satellite communications have the advantages of less transmission loss, shorter delay, and lower power consumption than geostationary earth orbit (GEO) satellite communications, which have drawn extensive research attention recently [5][6][7][8]. To increase transmission data rates, the multi-beam transmission technology is widely used in LEO satellite communications, which uses phased array antennas to generate multiple beams with different directions simultaneously [9][10][11]. In addition, the full frequency reuse (FFR) technique is employed to improve the spectrum efficiency, where all beams utilize the same frequency band [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the full frequency reuse (FFR) technique is employed to improve the spectrum efficiency, where all beams utilize the same frequency band [11][12][13][14]. To mitigate interference among different beams for the FFR technique, we focus on linear precoding in the space domain, which is widely used in satellite communications equipped with a uniform planar array (UPA) [9,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Given the relatively high altitude of the satellite, satellite communication channels have strong spatial directivity, and the angle of departure (AoD) of all propagation paths to one UT can be assumed identical. Thus, the channel can be regarded as a function of the angle information [9,13]. Motivated by this, we take advantage of the spatial angle information rather than high dimensional channel matrices to efficiently locate all orthogonal positions, which sharply reduces computational complexity.…”

Section: Introductionmentioning

confidence: 99%

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Low‐complexity user scheduling for LEO satellite communications

Sun

Wang

et al. 2023

IET Communications

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With the increasing number of user terminals (UTs), the interference among UTs might significantly decrease the throughput of the low earth orbit satellite communication system. In this paper, the user scheduling method is investigated to suppress user interference. Specifically, leveraging the strong spatial directivity of satellite channels, a low‐complexity angle‐based orthogonal user selection (AOUS) algorithm is proposed, which selects UTs with nearly orthogonal channels via angle information of UTs. A rate‐based proportionally fair (PF)‐AOUS algorithm is further proposed to ensure fairness among UTs, which combines the AOUS with the PF criterion. To reduce complexity, an improved angle‐based PF‐AOUS algorithm that schedules UTs according to their pitch angles rather than their rates is proposed. In addition, efficient precoding schemes for orthogonal UTs are designed by combining the steering vector and power allocation matrix, and it is shown that precoding can be converted into power allocation problems that further balance fairness and throughput. The numerical results indicate that the AOUS achieves a near‐optimal sum rate performance, and the angle‐based PF‐AOUS has the similar performance to the rate‐based PF‐AOUS, which achieves a high fairness index with the proposed precoding scheme.

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