The transmission of digital HDTV signals on satellite channels in the 20-30 GHz band is studied with the aim of designing an Italian domestic satellite, both for the exchange of programs among production centers and for direct broadcasting to end-users. Previous work on the definition of the system architecture and of the payloads is first briefly summarized. The transmission impairments due to...

In order to enhance the availability and the offered Quality of Service (QoS), Land Mobile Satellite Systems (LMSS) will have the option to use simultaneous transmission via two or more satellite as diversity. In this paper the performance of a TDMA and CDMA single user return link employing such a diversity reception is investigated by means of computer simulation using a three state mobile sa...

An integrated satellite-HAPS system is particularly suitable for supporting emergency communications. A key element for the efficient adoption of such systems is the enhancement of transport layer capability to support TCP-based applications. This paper proposes a detailed analysis of TCP performance over the target scenario, involving a DVB-RCS protocol stack for satellite air interface. I-PEP...

3G Third Generation 3GPP Third Generation Partnership Project A.R.N.I. Azienda Regionale per la Navigazione Interna ACK Acknowledge ADC Analog to Digital Converter ADNR European Committee for Standardization AFC Automatic Frequency Control AGC Automatic Gain Control API Application Programming Interface ASMS-TF Advanced Satellite Mobile Systems Task Force B/M Broad/Multi BER Bit Error Rate BLER...

In order to enhance the availability and the offered Quality of Service (QoS), Land Mobile Satellite Systems (LMSS) will have the option to use simultaneous transmission via two or more satellite as diversity. In this paper the performance of a TDMA and CDMA single user return link employing such a diversity reception is investigated by means of computer simulation using a multi state mobile sa...

Two different routing algorithm categories are studied in this paper for a typical LEO satellite constellation. Shortest path algorithms and optimal routing. Their performance is investigated through extended real time simulations. In the context of satellite constellations the basic parameters for a typical network such as delay, throughput, link utilization must be supplemented by new factors...