A novel method of using the Globalstar LEO constellation to provide 25 channels of digital-quality, audio broadcasting (DAB) to vehicles and homes throughout Australia is described. The low-cost approach will attract broadcasters who want to reach listeners throughout Australia especially in areas of low population density. By adaption of existing satellite radios, transmission systems and the ...

Adaptive Coding and Modulation (ACM) is a feature incorporated into the DVB-S2 satellite specification, allowing real-time adaptation of transmission parameters according to the link conditions. Although ACM was originally designed for optimizing unicast services, this article discusses the expansion of its usage to broadcasting streams as well. For this purpose, a general crosslayer adaptation...

This paper proposes a line-based semi-analog transmission scheme (Line-Cast) for satellite image broadcasting. At the transmitter, an image is compressed and transmitted line by line. Therefore, it is much beneficial to satellite applications with low onboard memories. The low delay feature also makes it possible that once a line is acquired, it can be readily coded and transmitted. Moreover, a...

This paper presents an overview of a satellite based broadcast layer to enhance the 3G and beyond 3G systems in the delivery of Multimedia Broadcast/Multicast Services (MBMS), as identified within the European IST integrated project MAESTRO. The foreseen content delivery architecture, also referred to as Satellite Digital Multimedia Broadcast (S-DMB) architecture, shall become an enabler for th...

Satellite transmissions classically use constant amplitude linear modulation schemes, such as M-state phase shift keying (M-PSK), because of their high robustness to amplifier non-linearities. However, other modulation formats are interesting in a satellite transmission context. For instance, non-linear modulations such as Gaussian minimum shift keying (GMSK) present a higher spectral efficienc...

The diffusion of wideband satellite services, especially in the field of digital TV broadcasting and/or interactive multimedia, suggests the adoption of spectrally-efficient high-level modulation techniques in future satellite transmission standards. It is known that such modulations suffers from nonlinear distortion due to amplification with on-board (nonlinear) high-power amplifiers, so that ...

Mobile ad hoc networks (MANETs) are proposed for emergency situations because they are self-organized and infrastructure-less. However, the mobility of the nodes and the lack of infrastructure pose challenges to the routing protocols. The signaling of these protocols is affected by the same problems as the data traffic: a multi-hop environment with limited bandwidth, collisions and bit errors. ...

A new modulation technique, "SP-QPSK" (sinusoidal shaped d4-QPSK) suitable for land-mobile and satellite digital broadcasting systems applications is introduced. In digital data and/or sound broadcasting systems, which may have a relatively low bit rate transmission requirement, the residual phase noise introduced by the Doppler shift of moving vehicles presents a high bit error floor in cohere...

The strategy for the development of television and radio broadcasting in Russian Federation until 2025 specifically states need to ensure reliability uninterrupted broadcasting. quality DVB-T2 is estimated by data transmission rate bit error BER (Bit Error Ratio) stability margin «at last mile» retransmitters’ broadcast zones. distributed client-server system monitoring RF, proposed article, us...

Following a recent upgrade, the Digital Video Broadcasting—Return Channel Satellite (DVB-RCS) standard sets up to support terminal mobility. In this scenario, integration with terrestrial systems becomes a primary concern to ensure network connectivity in urban areas. This article proposes an integrated satellite–terrestrial architecture for the provision of broadband services onboard high-spee...