基于下行NOMA的多波束卫星通信稳健波束成形算法

doi:10.11959/j.issn.2096-8930.2021043

Abstract

Abstract:

To improved the spectrum efficiency of multibeam satellite system and meet the requirement of multi-access, a robust beamforming and power allocation scheme based on non-orthogonal multiple access (NOMA) was proposed.Under the condition that the imperfect channel state information was known, fi rstly, a power minimization problem subject to probability constraints of users’ quality of service requirement and earth stations’ interference-to-noise ratio was formulated.In order to address the non-convex problem, we then adopted Bernstein inequality to converted the probability constraints into deterministic forms and decomposed the original problem into beamforming sub-problem and power allocation sub-problem, and the robust design was conducted by alternating optimization.Simulation results showed that the proposed scheme has better robustness and eff ectiveness compared with other existing schemes.

Key words: multibeam satellite system, non-orthogonal multiple access, probability constraint, power allocation, beamforming

CLC Number:

TP927

Pengcheng KAN, Zining WANG, Huaicong KONG, Jian OUYANG, Min LIN. Robust Beamforming Algorithm for Multibeam Satellite Communication Based on Downlink NOMA[J]. Space-Integrated-Ground Information Networks, 2021, 2(4): 53-59.

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参数	数值
卫星轨道	GEO
载频	18 GHz
卫星馈源数	N_S=7个
卫星天线最大增益	b_max=52 dB
雨衰系数	μ=3.125，σ=1.591
3dB角度	θ_3dB=0.4
噪声带宽	B=500 kHz
噪声温度	T=300 K

Robust Beamforming Algorithm for Multibeam Satellite Communication Based on Downlink NOMA

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