Interference canceling by fixed division of feeder link transmission band in multiple gateway HAPS system

摘要

PROBLEM TO BE SOLVED: To suppress interference in a multi-feeder link having the same frequency between an airborne communication relay device and a plurality of gateway (GW) stations. SOLUTION: A transmission signal band of a feeder link is divided into a plurality of divided frequency bands, and based on a reception result of a pilot signal received and separated from each of the plurality of GW stations, each of the plurality of GW stations and the communication relay device Multiple propagation path responses to the feeder link antenna of the above are estimated for each of the multiple division frequency bands with the central frequency of the division frequency band as the estimated frequency, and transmitted from the GW station based on the multiple propagation path responses. The weight for suppressing the interference signal that the transmitted signal is received by the directional beam corresponding to the remaining other GW stations and interferes is calculated for each divided frequency band, and corresponds to the GW station for each divided frequency band. From the received signal received by the directional beam, the received signal received by the directional beam corresponding to the other GW station is multiplied by the weight corresponding to the other GW station and subtracted. [Selection diagram] FIG. 22