Packet communication ultra-small aperture terminal system for the Hokkaido Integrated Telecommunication network

Abstract

Three aspects of a new minimum cost, high reliability system strategy for the Hokkaido Integrated Telecommunication aperture terminal (PC-USAT) system, which contains a method (HIT) network, in which real time operation is not demanded, are examined. These are: 1) a packet communication ultra-small for overcoming the satellite links rain attenuation discontinuities; 2) an optimum rain margin technique and the 14/12-GHz band rain, snow attenuation, and site diversity (SD) experiments; and 3) a low-bit-rate medical information and still-picture simultaneous transmission system. Satel 1 i te t

Ku-Band Long Distance Site-Diversity (SD) Characteristics Using New Measuring System

“…This is because at ES-A, the attenuation is estimated as the difference of the received with respect to the clear-sky [see (1)]. The measured attenuation is thus increased by the increase of the sky noise in the down-link frequency band during rain.…”

Communication control mechanism to adapt the quality change of a communication channel

“…Wired communications have high-quality communication channels and experience almost no fluctuations in the quality. In contrast, recently both the expansion of computer networks and the appearance of various applications have enabled the construction of computer networks employing satellite communication facilities due to the reduced size and lower cost of satellite communications facilities [1][2][3]. Accompanying this trend, there have been advances in a great deal of research on applications focused on broadcasting in satellite communications.…”