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Abstract

Introduction

System aspects

System design

Advantage

CONTENTS

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Advantage

Disadvantages

Applications

Conclusion

References

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.

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yet thoroughly investigated for mobile satellite systems.

Engage in a system performance comparison between

single polarization SISO and dual polarization non-

MIMO and MIMO configurations based on the DVB-SH

mobile satellite standard.

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

INTRODUCTION

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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

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

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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

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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

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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.

SISO,SIMO,MISO&MIMO

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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).

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receive signals (mobile terminal).

CONTD..

Employing MIMO provides three kinds of gains

array gain

diversity gain

Spatial multiplexing gain

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SYSTEM ASPECTS

Selecting between linear and circular dual polarization

The most common alternatives of dual polarization in wireless communication are :

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Linear polarization (LP)

Circular polarization (CP)

Conventional single polarization SISO MSB systems operating at L- or S-band

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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.

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Fig. Example of a (a) SPPB and a (b) DPPB MSB frequency plan.

Satellite payload aspects

From the satellite payload/antenna point of view,

DPPB is feasible in both single (global) beam coverage.

Interference Considerations

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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.

CAPACITY BOUNDS OF THE DUAL POLARIZATION

LMS CHANNEL

The performance of any MIMO technique depends

drastically on the underlying channel characteristics.

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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.

PERFORMANCE OF DUAL POLARIZATION MSB

SYSTEMS

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Fig. Performance of SISO, 2×SISO and MIMO encoding alternatives

over the 2 × 2 dual polarization MIMO LMS ITS channel.

DVB-SH SYSTEM

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Fig. DVB-SH system including a space-time encoder/decoder module.

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

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Fig. DVB-SH network architecture

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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.

ADVANTAGES

It increase the data rate and decrease the error rates

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DISADVANTAGES

Launching satellites into orbit is costly.

Satellite bandwidth is gradually becoming used up.

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APPLICATIONS

Mobile TV broadcasting

Digital Video Broadcasting Services

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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

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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.

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

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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. 215-240,2009.

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