As an initial step in explorirq~ the opportunities afforded by the merging of sate] lite and terrestrial networks, BcHcorc and JP1. conducted several experiments utilizing Ilellcore’s experimental Personal Communications System, NASA’s Advanced Communications Technology Satellite (ACTS) and JP1,’s ACTS Mobile Terminal. These expcritnents provided valuable information on the appl icat ions, inte...

The purpose of this paper is to develop and demonstrate Simulation of Satellite Communications (SIMSATCOM), a high resolution, stochastic simulation of satellite communications for evaluating the effectiveness of message transmission and receipt by specified senders and receivers. SIMSATCOM is designed to operate as a standalone simulation, but may be adopted as a high resolution module for a l...

In this report, two hybrid ARQ error control schemes are proposed for NASA near earth satellite communications. Both schemes are adaptive in nature, and employ cascaded codes to achieve both high reliability and throughput efficiency for high data rate file transfer. TWO HYBRID ARQ ERROR CONTROL SCHEMES FOR NEAR EARTH SATELLITE COMMUNICATIONS

One of the aims of the SatNEx (Satellite Network of Excellence, http://www.satnex.de) European project is to provide the scientific community that operates on satellite communications with measurement campaign results and evaluation tools, in order to support research activities that investigate problems in satellite communications at different levels of the OSI stack. In fact, the research act...

The intent of this note is to report on work in progress on the problem of designing optimal satellite data communication channels for today’s data networks. Satellites have been used for data communications for many years. However, both changes in speeds and protocols in use now make it much harder to provide effective data communications on satellite channels. We will begin by reviewing the r...

The objective of our paper is to improve efficiency (in terms of throughput or system capacity) for mobile satellite communications. In this context, we propose an enhanced Hybrid Automatic Repeat reQuest (HARQ) for delay tolerant services. Our proposal uses the estimation of the mutual information. We evaluate the performance of the proposed method for a land mobile satellite channel by means ...