| Author | Bajracharya, Prabin |
| Call Number | AIT RSPR no.TC-01-09 |
| Note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The satellite communication systems are the most suitable to provide broadband multimedia services to globally scattered users. The future LEO satellite systems are using Ka band, it would be interesting to investigate and study the performance of the proposed LEO system for multimedia under the rain attenuation as the signal at these frequencies are affected severely by rain. In our study, TELEDESIC system, which is proposed to provide multimedia service using Ka band is selected to evaluate its performance in the presence of predicted rain attenuation. This research study presents a model to measure the performance of multimedia transmission through LEO satellite communication system with the predicted rain attenuation. The rain attenuation is calculated using Garcia model. The performance measurement of the uncoded signal, and coded signal with the satellite link using the rate Y2 , constraint length 3 convolutional encoder and Viterbi decoder is catTied out for uplink rain only and downlink rain only. The performance of satellite uplink and downlink are studied for coded signal by varying the transmit power of the wanted ground terminal and the satellite respectively. Moreover, the performance study is catTied out in uplink with uplink rain only for coded signal by varying the wanted ground terminal antenna diameter. Based on simulation results, the considered model can support information bit rate 2.4 kbit/s using uncoded signal in uplink with BER requirement 10ยท 3 for the case of downlink rain only. Using the coded signal the uplink and the downlink can support the other higher information bit rates with different BER requirements depending on the uplink rain only and downlink rain only case. The high value of the transmit power is required to support the higher information bit rate and rain rate. With the considered model with non- steerable ground terminal antenna, the increase in diameter of the ground terminal antenna does not improve the performance of link. |
| Year | 2001 |
| Type | Research Study Project Report (RSPR) |
| School | School of Advanced Technologies (SAT) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi M. |
| Examination Committee(s) | Teerapat Sanguankotchakom ;Fernando, W.A.C |
| Scholarship Donor(s) | Government of Finland |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2001 |