Adaptive bandwidth assignment scheme for sustaining downlink of Ka-band SATCOM systems under rain fading

Abstract

Although the Ka-band SATCOM systems provide broad bandwidth, its received signal on earth is significantly attenuated and even the downlink is disconnected by rain fading. In this paper, an adaptive bandwidth assignment scheme is proposed for sustaining the downlink of Ka-band SATCOM systems under rain fading. The proposed scheme is operated in accordance with rain attenuation. In the proposed scheme, the assigned bandwidth is adaptively determined to concentrate the transmit power on the limited bandwidth since the maximum transmit power from the satellite is fixed. Simulation results demonstrate that the proposed scheme overcomes the rain fading and effectively sustains the downlink of Ka-band SATCOM systems. © 2011 Springer-Verlag.