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題名 | Timing Recovery in ISDN U-Interface with 2B1Q Line Code=使用2B1Q碼之數位用戶迴路U 界面時序回復方法之研究 |
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作者姓名(中文) | 魏哲和; 孔聖耀; 黃正華; | 書刊名 | 中國工程學刊 |
卷期 | 14:4 1991.07[民80.07] |
頁次 | 頁349-357 |
分類號 | 448.6 |
關鍵詞 | 用戶; 回復; 界面; 時序; 迴路; 數位; |
語文 | 英文(English) |
中文摘要 | 本論文詳細探討一種整體服務數位網路(ISDN)U界面使用2BIQ碼的時序回復方法 。這個方法的取樣頻率等於鮑率,所以不會增加回音消除器( EC )和判別式回饋等化器( DFE )的複雜度。我們使用一個整形濾波器以使樣點不受前方碼際干擾的影響,另外我們還 使用了一個序列迴路濾波器以減低取樣點的跳動。 使用電腦來模擬判別式回饋等化器和時序回復的工作情形,證明這個方法可以成功地應用在 數位用戶迴路的傳收器上,並且不受橋式接頭存在的影響。同時我們也以可程式邏輯陣列進 行硬體製作,測試結果顯示本時序回復系統效果良好,相位誤差低於百分之三。 |
英文摘要 | Timing recovery is a crucial function in synchronous digital communication systems when extracting a proper sampling phase from the received pulses. This paper describes a timing recovery method for an integrated services digital network (ISDN) U-interface with 80 kbaud 2B1Q code. In this method, the sampling rate is equal to the symbol rate. A shaping filter is introduced to make the recovered timing phase have zero precursor to suppress the precursor intersymbol interference. The timing jitter is reduced by using a sequential filter. Computer simulations for joint operation of a decision feedback equalizer and the timing recovery circuit are performed.. The results indicate that this method is satisfactory and is not susceptible to bridged-taps reflections. A hardware implementation of the timing recovery circuit using programmable logic arrays is completed to demonstrate the feasibility of this method. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。