Conventional GEO satellite communication systems rely on a multibeam foot-print with uniform resource allocation to provide connectivity users. However, applying is inefficient in presence of non-uniform demand distribution. To overcome this limitation, the next generation broadband will enable flexibility terms power and bandwidth assignment, enabling on-demand allocation. In paper, we propose...

The National Institute of Information and Communications Technology (NICT) has been studying a new mobile communication system, named Satellite-Terrestrial Integrated Mobile Communication Systems (STICS)[1]. The STICS is a mobile phone system in which terrestrial mobile and satellite communication systems coexist, and is seamlessly integrated in the same frequency band. We aim for the realizati...

In this paper multiple antenna channel codes, i.e. Space-Time Block Code, Space-Time Trellis Code and SuperOrthogonal Space-Time Trellis Code, are examined in a satellite communication, comparing the gain that the multiple antenna channel coding techniques provide to the communication system. The satellite channel for urban area, modeled as a combination of Rayleigh and log-normal processes wit...

We developed a multimedia satellite network system based on the Internet protocol (IP) and personal computers. It enables collaborative distance education between outdoor and indoor environments. Integration of IP technologies and satellite communications enhances the flexibility of the network system. The satellite communication system enables us to communicate to and from outdoor environments...

Due to lack of resources such as transmission power and bandwidth in satellite systems, resource allocation problem is a very important challenge. Nowadays, new heterogeneous network includes one or more satellites besides terrestrial infrastructure, so that it is considered that each satellite has multi-beam to increase capacity. This type of structure is suitable for a new generation of commu...

Satellite communications and relaying techniques have been receiving the attention of the research community over the last years. This paper proposes a terrestrial to satellite communication system aided by terrestrial relay nodes to facilitate a robust, reliable, and efficient communication link and improve the spectral efficiency. In particular, this paper concentrates on evaluating the spect...

Abstract There has been a growing interest in using small satellites (SmallSats) for future lunar navigation and communication satellite system (LNCSS). We conceptualize the design of SmallSat-based LNCSS with Earth-global positioning (GPS) time transfer that provides services near south pole. A hybrid constellation is formulated, wherein all provide while only fraction are communicati...