Transceiver design for high altitude pseudo satellite aided dual satellite systems

Abstract

This work focuses on a dual satellite system (DSS) where two multiple spot beam geosynchronous satellites transmit simultaneously on the same frequency across all spot beams. The intra-satellite co-channel interference is managed through precoding, while the inter-satellite co-channel interference is managed with successive interference cancellation (SIC) at the user terminals. The SIC eliminates the strongest co-channel interference from an adjacent satellite while treating the remaining interfering signals as noise. The power required at the transmitter to achieve the desired data rate is formulated as a semidefinite programming problem and relaxed rank constraints. The SIC-based receivers are shown to achieve a better data rate than traditional detectors that treat co-channel interference as noise while saving transmit power at the satellites. Though SIC-based DSS achieves better throughput than a single satellite system, the receiver complexity is high. A high-altitude pseudo satellite (HAPS) aided DSS is proposed to address this issue. In the case of HAPS-aided DSS, users within each spot beam are served by a HAPS, and the HAPSs use SIC to detect signals from satellites. The user terminals in HAPS-aided DSS can use simple detectors as HAPS eliminates co-channel interference through precoding. The full-duplex HAPS-aided DSS is shown to outperform SIC-based DSS.