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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8211


    Title: 相容碼率打孔渦輪碼應用於區域多點分配服務系統;Rate Compatible Punctured Turbo Codes for LMDS Systems
    Authors: 闕振哲;Jhen-jhe Cyue
    Contributors: 通訊工程研究所
    Keywords: 區域多點分配服務系統;渦輪碼;打孔;雨衰;細胞內干擾;服務品質;LMDS system;rain fade;Puncture;inter-;Turbo code
    Date: 2007-06-14
    Issue Date: 2009-09-22 11:21:08 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: LMDS系統是一項受人關注的技術,LMDS系統是使用在20-50GHz之雙向數位式細胞系統,它提供語音、多媒體及數據傳輸之服務,LMDS可以滿足各種類型使用者的需求。但是,在LMDS系統中雨衰及細胞內干擾是影響服務品質因素。 為了減少LMDS系統中雨衰和細胞內干擾的問題,我們提出新的標準由打孔模式的選擇,導致雨衰相關有系統的相容碼率碼改進LMDS系統的效能。根據系統的環境,一個關於雨衰的參數將用來調整碼率減少冗餘位元和改進頻譜效益。模擬結果顯示提出相容碼率打孔渦輪碼在區域多點分配服務系統相較於沒有打孔的渦輪碼的方案獲得一個提升的頻譜效益。兩個方案的BER是相近的。 LMDS system is a two-way digital cellular system operating in 20-50 GHz, it offers the services of the audio, video, multimedia and data transmission, LMDS can meet all kinds of users' demands. However, rain attenuation and inter cell interference (ICI) influence the factor of Quality of Service (QoS) in LMDS system. In order to reduce the impacts of rain fade and of inter cell interference on LMDS systems, we propose a new criterion for the choice of the puncturing patterns, lead to systematic rate-compatible codes with respect to the rain attenuation to improve the performance of LMDS systems. In accordance with the system situation, a parameter with regard to rain attenuation will be used to adjust the code rate to reduce the redundancy bit and to improve the spectrum efficiency. Simulation results show that the proposed rate compatible punctured Turbo code for LMDS systems compared with without punctured Turbo code scheme leading an improvement of spectrum efficiency. And the BER of two schemes are close.
    Appears in Collections:[通訊工程研究所] 博碩士論文

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