| Title |
Adjacent Satellite Interference Cancellation in Dual-contact Satellite Scenario |
| Authors |
박홍원(Hong Won Park) ; 장윤선(Youn Seon Jang) |
| DOI |
https://doi.org/10.5573/ieie.2020.57.8.9 |
| Keywords |
LEO satellite; Dual-contact; Interference; Relative antenna gain; Joint minimum-distance |
| Abstract |
This paper studies an adjacent satellite interference mitigation technique of the ground receiver for the target satellite in dual-contact LEO satellite scenario where two LEO satellites are closely positioned within the radiation pattern of each ground station antenna and transmitting its data simultaneously. Especially, when an offset angle defined as the angle difference between the target satellite and the adjacent satellite is within the 1st null-point of radiation pattern of the adjacent ground station antenna and the two satellites are transmitting their data to the each ground station antenna, the receiver for the target satellite shows severely degraded performance corresponding to the relative antenna gain depending on an offset angle of the adjacent satellite for the target ground station antenna. Under interference condition, the conventional detectors normally either ignore the interference and try to decode the received data directly or successively detect and then remove the interference, assuming that the wanted signal and the interference are Gaussian. However, those receivers may exhibit error floors even at high SNR over specific interference levels or channel conditions. Assuming a priori knowledge of the channel state of an adjacent satellite, the joint minimum-distance (JMD) detector is utilized to mitigate the interference in different channel conditions to enhance the error floor where the interference level was calculated using a mathematical model of an antenna radiation pattern. The simulation result shows that the joint MD detector can significantly reduce the effect of adjacent satellite interference thereby improving the performance even under severe interference conditions, although the JMD technique needs more information about the interference and are complicated to implement. |