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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65969
標題: | 簡易時空編碼應用在中繼網路之載波頻率偏移估測 Carrier Frequency Offset Estimation for a Simple Space-Time OFDM Based Relay Networks |
作者: | Wen-Yang Chou 周文揚 |
指導教授: | 馮世邁(See-May Phoong) |
關鍵字: | 載波頻率偏移,正交分頻多工,中繼網路,時空編碼, OFDM,CFO,relay,STBC, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 無 The well known advantages of orthogonal frequency division multiplexing (OFDM) in combating inter symbol interference (ISI) and frequency selective fading channels have led wireless relay networks to use OFDM for data transmission. However,it is well known that OFDM systems are sensitive to carrier frequency o set(CFO). The performance of these wireless relay networks degrades signi cantly when there is CFO. In this thesis, we study CFO estimation for a simple Space-Time OFDM scheme for relay networks. First, We derive an explicit expression of the correlation of the received signals at destination node. Based on this expression, we propose a simple preamble design for CFO estimation. The proposed preamble enables us to jointly estimate the relay CFO and destination CFO at the destination. In other words, the relay nodes do not need to do the complicated computation of CFO estimation. Moreover, both ESPRIT and MUSIC algorithms are derived. As all the matrices involved in the computation are small (3 3), the complexity of the proposed method is low complexity. Moreover numerical simulation shows that the proposed method has good performance and it compares favorably with existing methods. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65969 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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