To MIMO or Not To MIMO in Mobile Satellite Broadcasting Systems

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  • 1. CONTENTS Abstract Introduction System aspects System design Advantage Disadvantages Applications Conclusion References
  • 2. ABSTRACT In mobile satellite broadcasting systems potential capacity advantages of introducing a dual polarization per beam paradigm instead of the conventional single polarization per beam. This enables the application of MIMO techniques, not yet thoroughly investigated for mobile satellite systems. Engage in a system performance comparison between single polarization SISO and dual polarization nonMIMO and MIMO configurations based on the DVB-SH mobile satellite standard.
  • 3. INTRODUCTION Mobile wireless communications are in constant evolution due to the continuously increasing requirements and expectation of both user and operators Broadcasting of multimedia services to mobile user terminals via geostationary satellites at L and S frequency bands is becoming increasingly attractive. Mobile satellite broadcasting (MSB) systems are now an integral part of hybrid broadcasting networks
  • 4. CONTD.. Ground component provides urban and indoor coverage and the satellite component is responsible for delivering a high QoS (quality of service) to rural environments and to less densely populated areas. DVB-SH represents the state-of-the-art, specifically designed to operate in hybrid satellite/terrestrial reception providing resistance against land mobile satellite (LMS) channel impairments
  • 5. CONTD.. Optimal use of the narrow MSB spectrum available, the potential advantages of migrating from the conventional single polarization per beam (SPPB) to an advanced dual polarization per beam (DPPB) MSB architecture. DVB standards have been challenged by the increasing demand of high data rate applications and larger indoor coverage area. MIMO is a key technology to increase the system capacity and link reliability without any additional bandwidth or transmit signal power.
  • 7. MIMO MIMO stands for Multiple Input - Multiple Output Patented by Bell Labs in 1984 There can be various MIMO configurations. For example, a 2x2 MIMO configuration is 2 antennas to transmit signals (from base station) and 2 antennas to receive signals (mobile terminal).
  • 8. CONTD.. Employing MIMO provides three kinds of gains array gain diversity gain Spatial multiplexing gain
  • 9. SYSTEM ASPECTS Selecting between linear and circular dual polarization The most common alternatives of dual polarization in wireless communication are : Linear polarization (LP) Circular polarization (CP) Conventional single polarization SISO MSB systems operating at L- or S-band
  • 10. Fig. UT RF front-end with satellite component in dual CP and ground component in dual LP. Given a terminal employing a pair of dual LP antennas, the choice of polarization for the satellite signal can be made independently according to the simplified block diagram depicted in Fig.
  • 11. Fig. Example of a (a) SPPB and a (b) DPPB MSB frequency plan.
  • 12. Satellite payload aspects From the satellite payload/antenna point of view, DPPB is feasible in both single (global) beam coverage. Interference Considerations From an interference point of view, the introduction of DPPB increases the amount of intra-system interference each beam is suffering from compared to conventional SPPB architecture.
  • 13. CAPACITY BOUNDS OF THE DUAL POLARIZATION LMS CHANNEL The performance of any MIMO technique depends drastically on the underlying channel characteristics. Fig. 1% MIMO outage capacity advantage including the effect of co-channel interference. The 2 × 2 dual polarization LMS SUB and the 2 × 2 spatial i.i.d MIMO channels are depicted.
  • 14. PERFORMANCE OF DUAL POLARIZATION MSB SYSTEMS Fig. Performance of SISO, 2×SISO and MIMO encoding alternatives over the 2 × 2 dual polarization MIMO LMS ITS channel.
  • 15. DVB-SH SYSTEM Fig. DVB-SH system including a space-time encoder/decoder module.
  • 16. DVB-SH is the name of a transmission system standard designed to deliver video, audio and data services to handheld devices. The key feature of DVB-SH is that it is a hybrid satellite/terrestrial system that allows the use of a satellite to achieve coverage of large regions
  • 17. Fig. DVB-SH network architecture TR (a) are broadcast infrastructure transmitters that provide reception in urban areas. TR (b) are personal gap fillers. Their purpose is to provide indoor coverage. TR (c) are mobile broadcast infrastructure transmitters.
  • 18. ADVANTAGES It increase the data rate and decrease the error rates
  • 19. DISADVANTAGES Launching satellites into orbit is costly. Satellite bandwidth is gradually becoming used up.
  • 20. APPLICATIONS Mobile TV broadcasting Digital Video Broadcasting Services
  • 21. CONCLUSION In favor of changing the traditional SPPB paradigm to a DPPB architecture for doubling the throughput of next generation MSB systems, showing that such a migration is feasible from a UT receiver, payload and antenna point of view. The most representative diversity and multiplexing achieving space-time codes were simulated both as FEC uncoded and coded employing the DVB-SH specification. It is shown thatfor the dual polarization LMS channel, MIMO can bring some diversity on top of the spectral efficiency increase provided by conventional 2xSISO systems.
  • 22. REFERENCES To MIMO or Not To MIMO in Mobile Satellite Broadcasting Systems Pantelis-Daniel Arapoglou, Member, IEEE, Paolo Burzigotti, Member, IEEE, Massimo Bertinelli, Member, IEEE,Ana Bolea Alamanac, and Riccardo De Gaudenzi, Senior Member, IEEE ETSI EN 302 583 V1.0.0, “Digital Video Broadcasting (DVB); framing structure, channel coding and modulation for satellite transmission to handheld (DVB-SH),” June 2007. A. Bolea Alamanac, P. Burzigotti, R. De Gaudenzi, G. Liva, H. Nghia Pham, and S. Scalise, “In-depth analysis of the satellite component of DVB-SH: Scenarios, system dimensioning, simulations and field trial results,” Int. J. Satell. Commun. Network, vol. 27, no. 4-5, pp. 215240,2009.