16QAM調變系統; 16 QAM Modulator

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Electrical Engineering > Electronic Thesis & Dissertation > Item 987654321/9194

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/9194

Title:	16QAM調變系統;16 QAM Modulator
Authors:	黃敏瑞;Ming-Ruan Huang
Contributors:	電機工程研究所
Keywords:	調變;16QAM;modulator;modulation
Date:	2001-06-19
Issue Date:	2009-09-22 11:42:54 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本論文主要是要架設一套資料量為6MHz，載波為50MHz的16QAM調變器，是為了配合數位DTV在無線傳輸方面的應用。因數位DTV系統，其每個channel頻寬為6MHz，而其頻段由60MHz至800MHz皆有，並且以16QAM為調變的方式，每6MHz惟一個頻寬。因此規格為6MHz為頻寬，50MHz為載波頻段，本文在analog device公司出品的ＡＤ9853，以滿足本文所要求的規格。而此顆IC為可程式化的，寫入的方式是藉由I2C通訊協定，由於這顆IC有許多的功能，包括Preamble，Randomizer，Reed-Solomom Encoder及FIR Digital Filter，其載波的頻段可調，data rate的速度可調等等，所以想要AD9853發射出什麼信號，就需要用I2C的方式來寫入。為實現I2C通訊協定，本文採用了兩種方式，1. PIC(單晶片)來實現 2.電腦並列阜加上74系列的控制IC來實現。單晶片的傳輸速度較快，而電腦並列阜的傳輸速度則較慢。 Because people need more and more service in wireless communication，so we have to raise our frequency to fit these requirement。For example，DTV(digital television ) is a kind of system that uses 28GHz in wireless communication，and it has many channels in 50MHz~900MHZ，each channel has 6MHZ data rate。The modulator for DTV is 16 QAM，and aspect of this thesis is 16 QAM modulator。 We use a chip is analog device AD9853，for this purpose，It's Function include : Preamble ， Reed-Solomom Encoder，Randomizer，16 QAM Modulation and FIR Digital Filter。We setup it according to its and program it by I2C communication algorithm which uses PIC(peripheral interface controller) and parallel port to implement 。
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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