20 February 2018 Spectrum and power allocation in cognitive multi-beam satellite communications with flexible satellite payloads
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Abstract
In this paper, the cognitive multi-beam satellite system, i.e., two satellite networks coexist through underlay spectrum sharing, is studied, and the power and spectrum allocation method is employed for interference control and throughput maximization. Specifically, the multi-beam satellite with flexible payload reuses the authorized spectrum of the primary satellite, adjusting its transmission band as well as power for each beam to limit its interference on the primary satellite below the prescribed threshold and maximize its own achievable rate. This power and spectrum allocation problem is formulated as a mixed nonconvex programming. For effective solving, we first introduce the concept of signal to leakage plus noise ratio (SLNR) to decouple multiple transmit power variables in the both objective and constraint, and then propose a heuristic algorithm to assign spectrum sub-bands. After that, a stepwise plus slice-wise algorithm is proposed to implement the discrete power allocation. Finally, simulation results show that adopting cognitive technology can improve spectrum efficiency of the satellite communication.
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Zhihui Liu, Zhihui Liu, Haitao Wang, Haitao Wang, Tao Dong, Tao Dong, Jie Yin, Jie Yin, Tingting Zhang, Tingting Zhang, Hui Guo, Hui Guo, Dequan Li, Dequan Li, } "Spectrum and power allocation in cognitive multi-beam satellite communications with flexible satellite payloads", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 1069756 (20 February 2018); doi: 10.1117/12.2307074; https://doi.org/10.1117/12.2307074
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