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研究生:葉怡初
研究生(外文):Yeh yi chu
論文名稱:以FPGA設計及實現GFSK調變器
論文名稱(外文):FPGA-BASED DESIGN AND IMPLEMENTATIONOF GFSK MODULATOR
指導教授:劉皆成
指導教授(外文):Jie-Cherng Liu
學位類別:碩士
校院名稱:大同大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:70
中文關鍵詞:設計及實現調變器
外文關鍵詞:DESIGN AND IMPLEMENTATION
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由於GFSK與FSK的調變原理相似,唯一差別為GFSK是在FSK調變器之前加入一個高斯濾波器 (Gaussian Filter),其最大頻率偏移量與傳送位元的速率都跟調變器的調變指數有關,也就是說,若其調變器的調變指數(Modulation Index)為0.5,其最大頻率偏移正好為傳送位元速率的一半,而高斯頻率鍵移(Gaussian Frequency Shift-Keying)調變方式因為擁有窄小的頻寬、好的雜訊免疫力及固定的封包,所以一些通訊系統諸如藍芽,Skypephone和低功耗數字接收器等)都使用它為其調變方式。在本篇論文中,一開始我們著重於GFSK調變原理的介紹,接著以藍芽系統中的GFSK調變為基礎,利用FPGA技術,分別完成每個小單元,諸如NRZ轉換器,高斯低通濾波器,累加器,正/餘弦的函數對應器,數位式複數混頻器,最後再將各個小單元整合,並且一步步來實現GFSK調制器的整體架構。
GFSK modulation is similar with FSK, the only different thing of them is added a Gaussian filter before a FSK modulator, the modulation index of modulator is in relation to maximum frequency deviation and data rate. In another way, if the modulation index of modulator is to 0.5, then the maximum frequency deviation is exactly the half time of data rate. The GFSK (Gaussian Frequency Shift Keying) modulation has some of benefits, like narrower bandwidth, good noise immunity, constant envelope etc. As it modulation scheme, some wireless systems such as Bluetooth, Skypephone and Low-Power Highly Digitized Receiver are all application of GFSK scheme. In this thesis, we will first introduce the fundamental of GFSK modulation, and refer to GFSK modulator of Bluetooth, then step-by-step complete the basic blocks by using FPGA, such as a NRZ converter, Gaussian low pass filter, 8-bits accumulator, SINE/COSINE LUTs, Digital complex mixer. After those blocks complete, I integrate those blocks to accomplish the implementation of GFSK modulator.
中文摘要 Ⅰ
ABSTRACT Ⅱ
誌謝 Ⅲ
目次 Ⅴ
LIST OF FIGURES Ⅶ
LIST OF TABLES ⅩⅠ
第1章 緒論 .1
1.1 藍芽系統的回顧與演變 .1
1.2 本文目的 .3
第2章 數位式的調變技術 .5
2.1 基頻帶搏碼傳輸理論 .5
2.2 連續相位調變(Continuous Phase Modulation) 12
2.3 Binary頻率移鍵調變(Binary FSK) 18
2.4 高斯頻率鍵移技術GFSK 25
第3章 GFSK 調制器的架構 33
3.1 系統概述 33
3.2 NRZ轉換器 35
3.3 高斯低通濾波器 (GLPF) 37
3.4 累加器 45
3.5 正/餘弦的函數對照表 50
3.6 數位式複數混頻器 55
第4章 應用FPGA來實現GFSK的調變技術 62
4.1 GFSK調制器的整合 62
4.2 GFSK調制器晶片的規格和內部結構平面圖 64
第5章 結論 67
REFERENCES 69
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