Space Time Code of High Diversity Gain for Dual Polarized MIMO in Hybrid Mobile Satellite Systems

The hybrid mobile satellite system operating in a single frequency network (SFN) mode is more and more popular, since the combination of satellite component (SC) and terrestrial component (TC) can provide better Quality of Service (QoS). This paper presents a novel way to realize the dual polarization MIMO transmission by using layered space time block code (LSTBC). The theoretical analysis and simulations indicate that the application of LSTBC can improve the system performance dramatically by making use of the space, time and polarization diversity. It provides a higher diversity gain than the previous space time (ST) codes when satellite and terrestrial link are both available. Even if one of the links is lost, it can still work properly and offers a performance equals to the satellite-only or terrestrial-only broadcasting system. Furthermore, it can be extended to the hybrid systems with multiple SCs and TCs.