以最小均方差法修正多重存取正交分頻多工接收機之載波頻率偏移

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姓名

李宗翰(Tsung-han Li) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

以最小均方差法修正多重存取正交分頻多工接收機之載波頻率偏移
(The MMSE Solution for Carrier Frequency Offset Correction at the OFDMA Receiver)

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摘要(中)

近年來多重存取正交分頻多工系統被視為未來多用戶無線通訊的主要技術。系統中受載波頻率偏移的影響，會破壞子載波正交性並產生子載波間干擾及多重使用者間干擾。過去研究中，我們已提出載波頻率偏移於接收端更正的新方法，能有效降低子載波間或多重存取干擾影響，讓整體或特定使用者效能達到最小均方差並降低錯誤率。在此系統架構中，估測共同載波頻率偏移是運用決策回饋的方式適應性收斂至最小均方差。本論文研究共同載波頻率偏移之最小均方差解，並利用其結果分析驗證使用適應性決策回饋的方式獲得之共同載波頻率偏移的可靠性。模擬結果顯示適應性決策回饋的方式可獲得最佳共同載波頻率偏移之更正並有效達到最小均方差效能。

摘要(英)

Recently, multi-access orthogonal frequency division multiplexing (OFDMA) has drawn a lot of attention in next-generation multiple access wireless communication technologies. The carrier frequency offsets in OFDMA systems can destroy the orthogonality among subcarriers and produce the intercarrier interference (ICI) and multiuser interference (MUI). In our previous works, we proposed a common carrier frequency offset (CCFO) correction scheme at the OFDMA receiver, which can reduce the ICI/MUI effect and the bit error rate by minimizing the mean square error (MSE) for demodulated data subject to the overall users or some specific users. In the scheme, the CCFO is obtained by adaptively converging the MSE between the demodulated output and the decision feedback data. This paper studies the minimum MSE solution for the CCFO value, and the result is exploited to verify the adaptive CCFO estimation algorithm by means of the decision feedback. Simulation results show that the adaptive decision feedback scheme for CCFO estimation is effective and the minimum MSE performance is well achieved.

關鍵字(中)

★ 多重存取正交分頻多工
★ 最小均方差法
★ 載波頻率偏移補償

關鍵字(英)

★ carrier frequency offset correction
★ OFDMA
★ MMSE solution

論文目次

第一章　序論 1
1.1　前言 1
1.2　章節架構介紹 3
第二章　OFDMA系統架構 4
2.1　OFDMA上行傳送端架構 4
2.2　OFDMA系統中受CFO的影響 6
2.3　OFDMA上行接收端架構 8
2.3.1　CTY補償法 8
2.3.2　Direct method補償法 9
2.3.3　CLJL補償法 10
2.3.4　HL補償法 12
2.4　補償法之MMSE Solution推導 14
2.4.1　CLJL補償法之MMSE Solution 16
2.4.2　HL補償法之MMSE Solution 19
2.5　CLJL/HL補償法之MSE 22
2.6　Interleaved-OFDMA系統中以常數項補償ICI之修正 23
第三章　以共同項(Common)CFO補償於上行OFDMA接收端系統 24
3.1　HL補償法前加CCFO補償之系統 24
3.2　CCFO估計法 25
3.3　補償法之MMSE Solution推導 28
3.3.1　CLJL補償法前加入CCFO補償之MMSE Solution 29
3.3.2　HL補償法前加CCFO補償之MMSE Solution 34
3.4　 CCFO+CLJL/HL補償法之MSE 38
3.5　Interleaved-OFDMA系統中以常數項補償ICI之修正 39
第四章系統模擬與分析 40
4.1 系統模擬參數設定 40
4.1.1　訓練序列(Training Sequence) 41
4.1.2　領航(Pilot)訊號的配置 42
4.1.3　载波頻率偏移估計及追蹤偵測 43
4.2　CTY/CLJL/HL補償法模擬結果 44
4.2.1　CTY/CLJL/HL補償法之MMSE分析 44
4.2.2　CTY/CLJL/HL補償法之性能比較 47
4.3　Common CFO補償法之模擬比較 51
4.3.1　Common CFO的觀察 51
4.3.2　利用MMSE Solution分析最佳之CCFO 56
4.3.3　CCFO+CLJL/HL補償法之性能比較 63
第五章結論 74
參考文獻 75

參考文獻

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指導教授

張大中(Dah-Chung Chang)

審核日期

2009-7-21

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