Title :
A high reliability VSAT transmitter using direct RF modulation
Author :
Roy, M.N. ; Ghose, A.K. ; Muthiah, V.
Author_Institution :
Dept. of Electron. & Telecom Eng., Jadavpur Univ., Calcutta, India
Abstract :
The authors present the improvement in reliability in a very small aperture terminal (VSAT) using direct modulation as compared to the conventional VSAT. The reliability of the conventional and the direct modulation VSAT are exhaustively analyzed in quantitative terms. For the purpose of reliability analysis, the equipment is divided into standard functional blocks. Failure rates are established for these standard blocks, which are then used to calculate the overall reliability. The overall reliability of the VSAT is improved by nearly 36% by using a direct modulation transmitter as compared to the conventional VSAT. However, when the transmit path of the VSAT alone is compared, the improvement is nearly 75%. The analysis was done for a single channel per carrier (SCPC)-type VSAT using frequency division multiple access (FDMA). A similar analysis was also done for a VSAT employing a code division multiple access (CDMA) scheme. The results are summarized
Keywords :
code division multiple access; frequency division multiple access; modulation; radio transmitters; reliability; satellite ground stations; CDMA; FDMA; code division multiple access; direct RF modulation; frequency division multiple access; high reliability VSAT transmitter; reliability analysis; single channel per carrier type VSAT; very small aperture terminal; Apertures; Costs; FETs; Low-noise amplifiers; Radio frequency; Radiofrequency amplifiers; Satellites; Synthesizers; Telephony; Transmitters;
Conference_Titel :
Computer and Communication Systems, 1990. IEEE TENCON'90., 1990 IEEE Region 10 Conference on
Print_ISBN :
0-87942-556-3
DOI :
10.1109/TENCON.1990.152572
