Abstract
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.
Highlights
In 4G systems, the major role of satellites will be to provide terrestrial fill-in service and efficient multicasting/broadcasting services [1]
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
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 ancillary terrestrial component (ATC)
Summary
In 4G systems, the major role of satellites will be to provide terrestrial fill-in service and efficient multicasting/broadcasting services [1]. It is known that it is difficult for a mobile satellite service (MSS) to reliably serve densely populated areas, because satellite signals are blocked by high-rise structures and/or do not penetrate into buildings. Under these circumstances, in a groundbreaking application to the Federal Communication Commission (FCC) in 2001, Mobile Satellite Ventures LP (MSV) unveiled a bold new architecture for an MSS with an ancillary terrestrial component (ATC) providing unparalleled coverage and spectral efficiency [2]. The main concept of the hybrid MSS/ATC architecture of the MSV proposal is that terrestrial reuse of at least some of the satellite band service link [3] frequencies can eliminate the above-mentioned problem.
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