%0 Journal Article
%T An Improved Power Estimation for Mobile Satellite Communication Systems
%A Byounggi KIM
%A Namgil LEE
%A Sangjin RYOO
%J Int'l J. of Communications, Network and System Sciences
%P 179-184
%@ 1913-3723
%D 2009
%I Scientific Research Publishing
%R 10.4236/ijcns.2009.23020
%X In this paper, in order to increase system capacity and reduce the transmitting power of the user's equipment, we propose a efficient power estimation algorithm consisting of a modified open-loop power control (OLPC) and closed-loop power control (CLPC) for mobile satellite communications systems. The improved CLPC scheme, combining delay compensation algorithms and pilot diversity, is mainly applied to the ancillary ter-restrial component (ATC). ATC link in urban areas, because it is more suitable to the short round-trip delay (RTD). In the case of rural areas, where ATCs are not deployed or where a signal is not received from ATCs, transmit power monitoring equipment and OLPC schemes using efficient pilot diversity are combined and ap-plied to the link between the user's equipment and the satellite. Two modified power control schemes are ap-plied equally to the boundary areas where two kinds of signals are received in order to ensure coverage conti-nuity. Simulation results show that the improved power control scheme has good performance compared to conventional power control schemes in a geostationary earth orbit (GEO) satellite system utilizing ATCs.
%K Power Control
%K Pilot Diversity
%K ATC
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=467