Update dan Informasi Terbaru

Pilihan yang paling Ideal adalah pada frekuensi Ku-band,karena dengan frekuensi ini aplikasi Broadband multimedia bisa lebih baik dan efesian digunakan (Bandwidth lebih lebar) Layanan internet satellite menggunakan media antenna parabola sebagai transmit & receive untuk segala aktivitasnya.Technology yang paling tepat & ideal saat ini adalah menggunakan system MF-TDMA (multi-frequency time division multiple access (MF-TDMA) system with onboard baseband processing)

This report addresses modulation and synchronization techniques for a multi-frequency time division multiple access (MF-TDMA) system with onboard baseband processing. The types of synchronization techniques analyzed are asynchronous (conventional) TDMA, preambleless asynchronous TDMA, bit synchronous timing with a preamble, and preambleless bit synchronous timing. Among these alternatives, preambleless bit synchronous timing simplifies onboard multicarrier demultiplexer/demodulator designs (about 2:1 reduction in mass and power), requires smaller onboard buffers (10:1 to approximately 3:1 reduction in size), and provides better frame efficiency as well as lower onboard processing delay. Analysis and computer simulation illustrate that this technique can support a bit rate of up to 10 Mbit/s (or higher) with proper selection of design parameters. High bit rate transmission may require Doppler compensation and multiple phase error measurements. The recommended modulation technique for bit synchronous timing is coherent QPSK with differential encoding for the uplink and coherent QPSK for the downlink.