Abstract
One of the key factors for the successful deployment of mobile satellite systems in 4G networks is the maximization of the technology commonalities with the terrestrial systems. An effective way of achieving this objective consists in considering the terrestrial radio interface as the baseline for the satellite radio interface. Since the 3GPP Long Term Evolution (LTE) standard will be one of the main players in the 4G scenario, along with other emerging technologies, such as mobile WiMAX; this paper analyzes the possible applicability of the 3GPP LTE interface to satellite transmission, presenting several enabling techniques for this adaptation. In particular, we propose the introduction of an inter-TTI interleaving technique that exploits the existing H-ARQ facilities provided by the LTE physical layer, the use of PAPR reduction techniques to increase the resilience of the OFDM waveform to non linear distortion, and the design of the sequences for Random Access, taking into account the requirements deriving from the large round trip times. The outcomes of this analysis show that, with the required proposed enablers, it is possible to reuse the existing terrestrial air interface to transmit over the satellite link.
Highlights
Introduction and MotivationIntegrated terrestrial and satellite communication system is a paradigm that has been addressed for many years and that is at the fore front of the research and development activity within the satellite community
We propose the introduction of an inter-Transmission Time Interval (TTI) interleaving technique that exploits the existing H-ARQ facilities provided by the Long Term Evolution (LTE) physical layer, the use of Peak-toAverage Power Ratio (PAPR) reduction techniques to increase the resilience of the OFDM waveform to non linear distortion, and the design of the sequences for Random Access, taking into account the requirements deriving from the large round trip times
We propose the following: (i) an inter-TTI (Transmission Time Interval) interleaving technique that is able to break the channel correlation in slowly varying channels by exploiting the existing H-ARQ facilities provided by the LTE physical layer; (ii) the introduction of PAPR reduction techniques to increase the resilience of the OFDM waveform to nonlinear distortions; (iii) a specific design of the sequences for the random access scheme, taking into account the requirements deriving from large satellite round trip times
Summary
Introduction and MotivationIntegrated terrestrial and satellite communication system is a paradigm that has been addressed for many years and that is at the fore front of the research and development activity within the satellite community. In order to replicate in 4G networks the success of the integrated mobile broadcasting systems, many initiatives are being carried out [2, 3] for the design of a satellite air interface that maximizes the commonalities with the 4G terrestrial air interface. These initiatives aim at introducing only those modifications that are strictly needed to deal with the satellite channel peculiarities, such, for example, nonlinear distortion introduced by the on-board power amplifiers, long round-trip propagation times, and reduced time diversity, while keeping everything else untouched. Satellite channel fades are typically frequency-flat, due to the almost Line-of-Sight (LOS) nature of propagation in open area environments, alternative solutions have to be designed in order to increase the satellite link reliability
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