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題名 | 混合光纖/同軸有線電視系統改善CSO/CTB參數之最佳化分頻配置=An Optimal Frequency-Division Arrangement Scheme for the Improvement of CSO/CTB in Hybrid Fiber/Coaxial CATV System |
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作者姓名(中文) | 洪鴻文; | 書刊名 | 技術學刊 |
卷期 | 15:4 2000.12[民89.12] |
頁次 | 頁643-650 |
分類號 | 448.88 |
關鍵詞 | 混合光纖/同軸有線電視系統; 載波合成二次拍差; 載波合成三次拍差; 最佳化分頻配置; Hybrid fiber-coaxial CATV system; Composite second order; CSO; Composite triple beat; CTB; Optimal frequency division arrangement scheme; |
語文 | 中文(Chinese) |
中文摘要 | 對於寬頻混合光纖/同軸網路之類比傳輸上,一般最令人困擾的載波合成二次拍差(CSO)、載波合成三次拍差(CTB)兩項二、三次非線性失真,大都是應用「分類多工」或「分波多工」之分頻技術來降低這兩項非線性失真所造成之干擾。然而分類技術中分頻頻段規劃是否得當,不僅主宰整個系統特性好壞與成本高低,還決定寬頻混合光纖/同軸網路中所應用的「分類技術」之成效。所以本文針對「以分頻技術優化類比傳輸CSO/CTB參數:決定頻段如何分割使用之準則?」的議題,作一合理且完整之探討與研究,藉由所設計程式模擬並計算在有限頻寬類比傳輸之限制下,各種分頻配置情況CSO/CTB之參數優化效益,希望能夠提出最少數目分頻頻段、CSO/CTB參數優化效益最高情況下之「最佳化分頻值」。 |
英文摘要 | When a video signal is transmitted over a broadband hybrid fiber-coaxial network, the second-and third-order nonlinear distortions, i.e., the so-called composite second order (CSO) and composite triple beat (CTB) always severely degrade the performance of AM-VSB CATV system. To alleviate the influence of these distortions, frequency-division and wavelength division are two of the most widely used multiplexing techniques. In those multiplexing techniques, the arrangement of frequency-division is heavily related to system performance and an efficient approach still remains to be found. In this paper, we explore the influence of different frequency-division arrangements on the CSO/CTB parameters and propose an optimal frequency-division arrangement scheme. Experimental results indicate that under the constraint of limited bandwidth, the proposed scheme can obtain better CSO/CTB parameters at the expense of using minimal number frequency –division. |
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