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題名 | Performance Evaluation of Low Earth Orbit (LEO) Satellite System under the Fading Factors=低軌道衛星系統衰減效應之效能評估 |
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作者 | 曾國雄; | 書刊名 | 臺北科技大學學報 |
卷期 | 34:1 2001.03[民90.03] |
頁次 | 頁39-46 |
分類號 | 448.813 |
關鍵詞 | 低軌道衛星系統; 衰減效應; 萊遜分佈; 中央動差技術; Low earth orbit; LEO; Satellite system; Fading factors; Ricean distribution; Central moment technique; CMT; |
語文 | 英文(English) |
中文摘要 | 本文旨在探討低軌道衛星通訊系統效能評估之理論分析。由於理論之評估侷限於方程式内,對於實際計算產生很大的困難。本文基於已知的衰減效應之統計特性,將理論上的評估方程式作一個近似的數值分析。由於衛星通訊之非線性特性及衰減效應為其系統之主要影響因素,因此本文採用雙變數模式描述衛星之非線性特性,而衰減效應以萊遜(Ricean)模式描述低軌道衛星頻道特性。結果顯示,在低軌道衛星通訊系統中,當衛星處於較低仰角時,衰減效應將是一個非常嚴重的影響因素。 |
英文摘要 | A theoretical solution for the performance of low earth orbit (LEO) satellite communication system is presented. This theoretical solution is hardly to be expressed in a closed form. The main concern is using an approximation based on the known moments of the fading factors. Since the effects of traveling wave tube amplifier (TWTA) nonlinearity and multipath fading are the main degradation factors, the numerical results are given as a function of those two factors. For this, two parameter instant model is used for TWTA and the fading channel is modeled as Ricean statistics. Results show that the fading is the serious degradation factor in a LEO system when the satellite locates at the lower elevation angels. |
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