請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/34045
標題: | 前置編碼對於正交頻率分割多工系統使用位元負載之分析 Study of Precoders for OFDM Systems with Bit Loading |
作者: | Kuo-Tai Chiu 邱國泰 |
指導教授: | 馮世邁(See-May Phoong) |
關鍵字: | 正交頻率分割多工系統,前置編碼,位元負載, OFDM,Precoder,Bit Loading, |
出版年 : | 2006 |
學位: | 碩士 |
摘要: | 傳統的正交頻率分割多工系統使用離散複立葉轉換的前置編碼矩陣是被大家所廣泛的認知為前置迴旋碼單載波系統。然而,在這個系統下,位元必須一致的被指派到每個子通道中。現在我們嘗試利用前置編碼矩陣將子通道分割成若干群。接著,我們可以用不同的位元配置到每個群。 The OFDM system has been successfully applied to wireless digital communications over the past several years. It is well-known that OFDM systems suffer from the noise enhancement problem due to channel spectral nulls and the PAPR problem. Recently, a new system called SC-CP (single carrier with cyclic prefix) system is receiving growing attention as another wireless transmission technique. This is because the SC-CP system can mitigate the noise enhancement problem and it doesn’t suffer from PAPR problem. Bit-loading algorithm is a powerful technique to improve BER performance in time-invariant channel. However, this technique can’t be applied to the SC-CP system which is a special kind of precoded OFDM systems. In this thesis, we propose a precoded OFDM system which can enjoy the advantage of the bit-loading algorithm. We will study the BER performance, PAPR reduction and the implementation complexity of the transmitter in our proposed system. We also carry out some simulations in time-invariant and time-variant channels. Besides, we also compare those systems with FEC and interleaving. Our simulation results validate that our proposed system can provide better BER performance than the OFDM and the SC-CP systems. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/34045 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-95-1.pdf 目前未授權公開取用 | 1.48 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。