Effects of monthly variation of rain attenuation on Ku-band satellite link availability : a case study of the digital TV broadcast system in Thailand | |
| Author | Theerasut Saraithong |
| Call Number | AIT RSPR no. TC-00-08 |
| Subject(s) | Television broadcasting--Thailand Artificial satellites in telecommunication |
| Note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. TC-00-08 |
| Abstract | Effects of averaging rain attenuation monthly are investigated and analyzed against the conventional way of quantifying the attenuation yearly. To explore the variations in Thailand, the DVB-S system via a THAICOM-3 Ku-band transponder is selected as a case study. Comparisons are carried out in terms of rain attenuation cumulative distributions and the related link availabilites (or outages). The outcome also suggests a possibility of uplink power preservation. Songkla rain attenuation characteristic demonstrates the most severe intensity over the exceeded percentages of 0.01 to 1, except for the months of August and September, in which the former dominated by Ubon Rachathani rain and the later by both Bangkok rain and Ubon Rachathani rain. Our results also show that the conventional way of using annually averaged rain attenuation to estimate monthly attenuation fails in accuracy, especially in Bangkok and Ubon Rachathani provinces of Thailand. The most disruptive availability belongs to Pathum Thani - Songkla link in the average. While May, August, September and October name the peak months in term of link outage, there exists full availability (no outage) during November - March. These significant variations directly indicate large prediction errors by yearly rain attenuation statistics. In designing a satellite link by employing annual rain attenuation, the operating uplink transmission power becomes more or less sufficient to maintain the availability of 99.7%. Considering monthly attenuation in such system can possibly reduce uplink transmission power during November - April and June-July while restricting the outage requirement. However, during May and August - October, severe rain attenuations do not allow any reduction of power |
| Year | 2000 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. TC-00-08 |
| 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) | Rajatheva, R.M.A.P.;Teerapat Sa-nguankotchakom; |
| Scholarship Donor(s) | The German Academic Exchange Service (DAAD); |
| Degree | Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 2000 |