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姓名 張煜偉(Yu-wei Chang) 查詢紙本館藏 畢業系所 通訊工程學系 論文名稱 多重路徑環境下之自動調變辨認演算法設計
(Automatic Modulation Classification Algorithm Design Under Multi-path Environment)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 多重路徑下作調變辨認的研究已經發展了一段時間,大部分主要的系統架構為藉由盲等化器(Blind Equalizer)將信號還原之後,再經由樣式辨認(Pattern Recognition)的方法做出調變種類的判斷。而盲等化器的步進值(step-size or adaptive coefficients)設定是一個決定等化之後還原的信號好壞的因素之一,進而影響調變辨認的正確率。為了提高等化器的效率,選擇一個能兼顧收斂速度與效果的步進值是必要的。但適當的步進值會因為不同的傳輸環境而改變。本論文利用代數方法推出下一次迭代所需要的最佳步進值,避開推導步進值範圍的複雜程序,使用最佳的步進值的等化器其收斂速度也比傳統固定步進值的等化器佳。也讓等化器可以自動適應不同環境變化,解決了通道環境改變之後需要手動重新調整步進值的問題,達到完全「自動」調變辨認的功能。 摘要(英) Automatic modulation classification (AMC) has been developed for a long time. In the presence of multi-path, multi-modulus algorithm, a blind equalization algorithm, is widely used to resolve the multi-path inter symbol interference (ISI). A good blind equalizing ability will result in a good AMC performance. But to my best knowledge, there is few papers mentioning how to choose the suitable step-size automatically to improve the performance of AMC.
Optimal step-size multi-modulus algorithm (OS-MMA), which gives a solution to choose the step-size, is derived and applied to automatic modulation classification (AMC) in this paper. The probability of correct classification of AMC with OS-MMA is compared with that of AMC with conventional MMA. And the simulation result shows that AMC with OS-MMA is superior to AMC with conventional MMA.關鍵字(中) ★ 自動調變辨認
★ 最佳化步進值
★ 多模數演算法關鍵字(英) ★ Automatic Modulation Classification
★ Optimal Step-size
★ Multi-modulus Algorithm論文目次 第一章 緒論 1
第二章 系統模型 5
2.1 系統模型 5
2.2 BLIND EQUALIZER 5
第三章 原理 8
3.1 PATTERN RECOGNITION 演算法原理: 8
3.2 BLIND 等化器: 14
3.2.1 The Godard Algorithm 14
3.2.2 Constant Modulus Algorithm 15
3.2.3 Multi-Modulus Algorithm(MMA) 16
3.2.4 Stochastic Gradient Method 17
3.2.5 Block (or fixed-window) Methods 19
3.2.6 Optimal Step-size 21
第四章 模擬結果 26
4.1 實驗一 32
4.2 實驗二 32
4.3 實驗三 33
4.4 效能比較 34
第五章 結論 38
參考文獻 39參考文獻 [1] Y. Sato, “A method of self-recovering equalization for multilevel amplitude modulation systems,” IEEE Trans. Commun., vol. COM-23, no. 6, pp. 679-682, Jun. 1975.
[2] P. A. Regalia, “A finite-interval constant modulus algorithm,” in Proc. ICASSP-2002, vol. III, Orlando, FL, May 13-17, 2002, pp. 2285-2288.
[3] Wei Wen, and Mendel J. M., “Maximum-likelihood classification for digital amplitude-phase modulations”, IEEE Trans. Commun.. Feb. 2000, Vol. 48, pp. 189-193.
[4] K. Assaleh, K. Farrell, and R. J. Mammone, “A new method of modulation classification for digitally modulated signals,” in Proc. MILCOM, vol. 2, San Diego, CA, 1992, pp. 712-716.
[5] E. E. Azzouz and A. K. Nandi, Automatic modulation recognition of communication signals. Norwell, MA: Kluwer, 1996.
[6] A. Polydoros and K. Kim, “On the detection and classification of quadrature digital modulation in broad-band noise,” IEEE Trans. Commun., vol. 38, pp. 1199-1211, Aug. 1990.
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[8] A. Swami and B. M. Sadler, “Hierarchical digital modulation classification using cumulants,” IEEE Trans. Commun., vol. 48, no. 3, pp. 416-429, 2000.
[9] Dobre, O.A., Bar-Ness, Y., and Wei Su, “Robust QAM modulation classification algorithm using cyclic cumulants,” Wireless Communications and Networking Conference '04 (WCNC 2004), vol. 2, pp. 745-748, Mar. 2004.
[10] D.N. Godard, “Self-recovering equalization and carrier tracking in two dimensional data communication systems,” IEEE Trans. Commun., VOL 60, pp 275-296,Feb 1981
[11] P. A. Regalia, “A finite-interval constant modulus algorithm,” in Proc. ICASSP-2002, vol. III, Orlando, FL, May 13-17, 2002, pp. 2285-2288.
[12] V. Zarzoso and P. Comon, “Blind channel equalization with algebraic optimal step size,” in Proceedings EUSIPCO-2005, XIII European Signal Processing Conference, Antalya, Turkey, September 4-8, 2005.
[13] Luokun Liu and Jiadong Xu, “A novel modulation classification method based on high order cumulants,” Networking and Mobile Computing, 2006. WiCOM 2006.International Conference on Wireless Communicat, 22-24 Sept. 2006.
[14] A. Ebrahimzadeh and G. Ardeshir, “A new signal type classifier for fading environments,”指導教授 陳永芳(Yung-Fang Chen) 審核日期 2007-7-19 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu 網路書籤 Google bookmarks del.icio.us hemidemi myshare