Expectation Comparison Models of Tropospheric Scintillation Distribution for Ku Band Frequency in Malaysia

This study has been performed base on an important of severely understanding about the characteristics of the local propagation signal data distribution and also the necessarily identified and predicted the overall impact of every significant attenuating factor along the propagation path as propagation impairment for the transmitted signal. The prediction of propagation impairment is the most important to do the link budget accurately and therefore a better designation of communication network system can be performed. According to that reason, this study has been conducted by using the sample data for one year data collection through Beacon satellite with the duration from April 2008 until April 2009. This collection of data with a frequency of 12.255 GHz (Ku-band) and the elevation angle of 40.1° had been analyse by getting the average value of signal amplitude, χ and also the standard deviation, σ that normally measured in dB to get the long-term distribution of scintillation intensity. The result from this analysis shows that the distribution of scintillation intensity followed the Gamma distribution for the long-term data distribution. Based on this result, then the selected existing prediction model which is Karasawa, ITU-R, Otung, and Akhondie has been compared to get the best performance of prediction model for the selected of data with the specific meteorological parameter. This all four models have been compared referring to the value of RMS error to determine the performances of each model compared with measurement value. The result from this study shows that Otung has the best overall performance compared to other model.