Performance analysis of MIMO AF CDMA hybrid satellite-terrestrial cooperative networks using multiple relays strategy for downlink

Abstract

This study investigates dual-hop fixed amplify-and-forward relaying performance analysis utilizing cooperative code division multiple-access (CDMA) systems for hybrid satellite terrestrial cooperative networks (HSTCNs). The system performance is evaluated over independent non-identical (i.n.i.) shadowed-Rician fading channels for the links of the satellite-terrestrial base station relays and the satellite-mobile user link. However, Nakagami-m fading channel is considered for the terrestrial base station relay-mobile destination link. In this study, the main contribution is to implement multiple-input multiple-output (MIMO) configuration is applied on the CDMA HSTCNs, where the overall system performance is studied under different MIMO configurations at the source, relay and destination nodes. The spatial diversity of the multiple antennas is provided by employing the maximum ratio combining scheme. The study examines also the system performance under various numbers of cooperative relays as well as using both orthogonal and non-orthogonal codes between the users. A novel closed expression for the moment generating function of the total end-to-end signal-to-noise ratio for three different transmission strategies. This is to calculate the outage probability, probability of error and the ergodic capacity. Moreover, the analytical and Monte-Carlo simulation results are developed for different transmission techniques to show the improvement in the performance of the proposed HSTCNs.