Spectrum sharing and interference mitigation among constellations of satellites is becoming increasingly important as large scales of constellations are being deployed. Low Earth orbit satellites are more prone to interferences because of their close spacings. To maintain continuous coverages and services, an autonomous method to mitigate interferences is needed. The autonomous method requires a real-time feedback parameter with the following characteristics: high sensitivity to inter-symbol interference, well-behaved fast response to interference levels, and the capability in making continuous quantitative measurements. The most common parameter to monitor link performance is the signal-to-interference-and-noise ratio (SINR). Adjacent satellite interferences are non-Gaussian in nature such that the conventional SINR measurement with dominant gaussian thermal noise becomes inadequate. This paper proposes a unique method to improve SINR sensitivity to adjacent satellite interference levels using the Walsh-Hadamard transform, where discrete inter-symbol interferences can be transformed and spread like Gaussian noise. The working principle of the method, its detailed implementation, and a case study example are presented.
Autonomous interference management method for LEO constellations
2023-01-01
677741 byte
Conference paper
Electronic Resource
English
The autonomous sciencecraft constellations
NTRS | 2003
|MEGA-CONSTELLATIONS AS ENABLER OF AUTONOMOUS SHIPPING
TIBKAT | 2021
|Mega-constellations as enabler of autonomous shipping
British Library Conference Proceedings | 2021
|Distributed Planning in Constellations of Autonomous Spacecraft
British Library Conference Proceedings | 1999
|