完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.author | 顏義修 | zh_TW |
dc.contributor.author | 蘇育德 | zh_TW |
dc.contributor.author | Yen, Yi-Hsiu | en_US |
dc.contributor.author | Su, Yu-Ted | en_US |
dc.date.accessioned | 2018-01-24T07:42:04Z | - |
dc.date.available | 2018-01-24T07:42:04Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.uri | http://etd.lib.nctu.edu.tw/cdrfb3/record/nctu/#GT070260239 | en_US |
dc.identifier.uri | http://hdl.handle.net/11536/142351 | - |
dc.description.abstract | 分交錯器多重接取 (IDMA) 乃利用不同的交錯器 (interleaver) 來辨別用戶的一種多重接取技術。此技術可利用簡單的碼片 (chip by chip, CBC) 多用戶偵測方法,讓偵測用戶的計算複雜度不會因用戶數的增加而遽增。相較於CDMA需事先設計具低相關性展頻碼群才能有較好的效能,IDMA使用具一定亂度的隨機產生的交錯器即可達到不錯的效能,因此用戶容量相對的高。在本論文中,我們將渦輪碼與IDMA系統結合,比較了利用渦輪碼編碼與傳統的捲積碼的IDMA系統在不同參數條件下效能。此外,我們也將原本使用BPSK之調變法改成DPSK調變,讓重複器(repetition unit)與交錯器加DPSK調變組成一等效的重複累積碼(repetition-accumulate code, RA code)並加上額外的交錯器。從電腦模擬結果可發現相較於使用捲積碼之傳統IDMA系統,使用渦輪碼編碼之IDMA系統能有較佳的效能;另外使用DPSK調變之IDMA系統,其效能亦比其他兩種IDMA系統有較低的錯誤層(error floor)。 | zh_TW |
dc.description.abstract | Interleave division multiple access (IDMA) is a multiple access scheme that employs user-specific interleavers to differentiate users. It uses a simple chip by chip multiuser detection method which requires a constant per-user computational complexity, independent of number of system users. Compared with the coded division multiple access (CDMA) method, IDMA scheme can provide single-user performance by using simple repetition coding and random interleaving in addition to a common forward error correcting (FEC) code while CDMA requires a family of low cross-correlation spreading codes. In this thesis, we first consider IDMA systems that use either a turbo or convolutional code as the common FEC code. An alternative system structure replaces BPSK modulator by a DPSK modulator and insert an interleaver after the DPSK modulator. The combined repletion (unit) interleaver and DPSK modulator is equivalent to a repetition-accumulation (RA) encoder. Numerical results show that our turbo code based IDMA (TC-IDMA) scheme is able to outperform the conventional (convolutional code based) IDMA system and the DPSK-based system yields much lower error floor. | en_US |
dc.language.iso | zh_TW | en_US |
dc.subject | 分交錯器多重存取 | zh_TW |
dc.subject | 渦輪碼 | zh_TW |
dc.subject | 微分相位調變 | zh_TW |
dc.subject | IDMA | en_US |
dc.subject | Turbo code | en_US |
dc.subject | DPSK | en_US |
dc.title | 基於渦輪碼之分交錯器多重存取 | zh_TW |
dc.title | Turbo Code Based Interleave Division Multiple Access | en_US |
dc.type | Thesis | en_US |
dc.contributor.department | 電信工程研究所 | zh_TW |
顯示於類別: | 畢業論文 |