To MIMO or Not To MIMO in Mobile Satellite Broadcasting Systems
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.
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
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
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
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.
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).
Employing MIMO provides three kinds of gains
Spatial multiplexing gain
Selecting between linear and circular dual
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
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.
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.
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
CAPACITY BOUNDS OF THE DUAL POLARIZATION
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.
PERFORMANCE OF DUAL POLARIZATION MSB
Fig. Performance of SISO, 2×SISO and MIMO encoding alternatives
over the 2 × 2 dual polarization MIMO LMS ITS channel.
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
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
TR (c) are mobile broadcast infrastructure transmitters.
It increase the data rate and decrease the error rates
Launching satellites into orbit is costly.
Satellite bandwidth is gradually becoming used up.
Mobile TV broadcasting
Digital Video Broadcasting Services
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.
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
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.