國立臺灣大學電機工程學系暨研究所汪重光2006-07-252018-07-062006-07-252018-07-061999-07-31http://ntur.lib.ntu.edu.tw//handle/246246/7714本文介紹一用於纜線調變解調器之雙模正交 振幅調變/殘邊帶調變超大型積體電路架構以解決 末端迴路瓶頸的問題。為了提供給正交振幅調變與 殘邊帶調變兩種模式的實體層同步，將採用經等化 過的通道之決策導向方式來設計符號時序與載波 恢復系統。藉由使用基於最小均方多層盲等化演算 法，整個系統於以下的環境下執行有限字長模擬： ±6kHz 載波頻率偏移，±200ppm 符速率偏移，距 載波20kHz 遠處有-82dB 的載波浮動，以及在類比 數位轉換器輸入有37dB 的信號雜訊比。This project proposes a dual-mode QAM/VSB transceiver VLSI architecture of cable modems to solve the bottleneck of the last-mile loops. In order to perform physical layer synchronization for both QAM and VSB modes, decision-directed methods are adopted using equalized channel for both symbol timing and carrier recoveries. Using the multi-stages LMS-based blind equalization algorithm, finite wordlength simulations of full system were conducted under the conditions of ±6kHz carrier frequency offset, ±200ppm symbol-rate offset, -82dB carrier jitter at 20kHz away from the carrier frequency, and 37dB SNR at ADC input.application/pdf154558 bytesapplication/pdfzh-TW國立臺灣大學電機工程學系暨研究所正交振幅調變/殘邊帶調變纜線調變解調 器實體層同步決策導向最小均方盲等化有限字長QAM/VSBcable modemsynchronizationdecision-directedLMSblind equalizationfinite word-lengthreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/7714/1/882215E002042.pdf