Interference Cancellation and Coordination Scheme for Sounding Reference Signal in Multiple-Beam Mobile Satellite Communication System

In LTE system, sounding reference signal (SRS) is transmitted for channel detection to obtain uplink scheduling gain. However, in multiple-beam mobile satellite communication system (MMSCS), large inter-beam and intra-beam interference destroy orthogonality for SRS from different users and lead to lower received SNR. Subsequently, the system cannot predict the channel exactly and will suffer from performance loss. In this paper, an interference cancellation and coordination scheme is presented. This new scheme, by taking MMSCS resources and channel conditions into account, can improve SRS performance after reducing and avoiding interference. One aspect of the presented method is interference cancellation scheme which comprises resending scheme for inter-beam interference and orthogonality enhancement scheme for intra-beam interference. Another aspect is interference coordination scheme, which carries out short SRS hopping between users and acquires the full bandwidth information by several detections. Simulation results confirm the correctness and effectiveness of the above scheme.