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研究生:何友仁
研究生(外文):Yu-Jen Ho
論文名稱:話音頻帶上編碼調變系統之研製
論文名稱(外文):Study and Implementation of Voice-bandCoded Modulation System
指導教授:蘇賜麟
指導教授(外文):Szu-Lin Su
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程學系碩博士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:85
中文關鍵詞:德州儀器回音消除器格狀編碼調變器全雙工的調變解調器正交振幅調變適應性等化器
外文關鍵詞:adaptive equalizerTITCMfull duplex modemQAM
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我們以正交振幅調變( QAM )配合回音消除器的方式,實現了話音頻帶上全雙工的調變解調器,使得信號可以在一般交換式電話網路( GSTN )上傳輸。
為了達到更好的效能,我們選擇格狀編碼調變器( TCM )做為錯誤控制編碼。我們使用複數型態適應性等化器來克服符號間干擾( ISI )並且使用差分編碼器來避免相位的不明確性。在另一方面,自動增益控制( AGC ),倒頻器( scrambler ),時間同步,相位同步,以及上升餘弦濾波器也都被包含在系統中。
此系統先由SPW進行模擬,再以德州儀器公司所生產的TMSC6711DSK實現。系統的鮑率是2.4kHz,位元率是9.6- kHz,取樣頻率為28.8kHz,而載波頻率為1.8kHz。
For data communication over the General Switch Telephone Network (GSTN), we use the quadrature-amplitude modulation (QAM) with echo canceller to implement the duplex modem in the voice-band.
In order to attain better performance, we choose the Trellis-coded modulation (TCM) as error control code. The complex adaptive equalizer would overcome the problem of intersymbol interference (ISI) and using differential coding would avoid the phenomenon of phase ambiguous. In the other hand, Auto Gain Control (AGC), scrambler, Timing recovery, frequency recovery, carrier recovery, and Root Raised Cosine (RRC) filter are demanded for our system.
The duplex modem is simulated by Signal Processing Work-system (SPW) and implemented by the TMS320C6711 DSK processor. The baud rate is 2.4 kHz with 9.6 kHz bps, and sampling rate is 28.8 kHz. The carrier frequency is 1.8 kHz in the system.
Abstract Ⅰ
Contents Ⅱ
List of Table Ⅳ
List of Figures Ⅴ

1 Introduction 1
2 Transmitter 4
2.1 Overview of Transmitter. . . . . . . . . . . . 4
2.2 Scrambler . . . . . . . . . . . . . . . . . . 6
2.3 Differential Encoder . . . . . . . . . . . . . 8
2.4 Trellis Encoder and Signal Mapping . . . . . . 11
2.5 Carrier modulation . . . . . . . . . . . . . .15
2.6 Root Raised cosine Filter . . . . . . . . . . .17
2.7 D/A Converter and Lowpass Filter. . . . . . . .18
2.8 Hybrid Circuit and channel. . . . . . . . . . .19

3 Receiver 21
3.1 Overview of Receiver. . . . . . .. . . . . . . .21
3.2 A/D Converter . . . . . . . . . . . . . .. . . .22
3.3 Carrier Demodulation and Matched filter . . . . 23
3.4 Echo Canceller . . . . . . . .. . . . . . . . . 25
3.5 Complex Adaptive Equalizer . . . . . . . . . . 30
3.6 Timing Recovery . . . . . . . . . . . . . . . . 33
3.7 Carrier Recovery. . . . . . . . . . . . . . . . 35
3.8 Trellis Decoder . . . . . . . . . . . . . . . .36
3.9 Differential decoder . . . . . . . . . . . . . 42

4 System Simulation 44
4.1 Transmitter Simulation . . . . . . . . . . . . 44
4.2 Receiver Simulation . . . . . . . . . . . . . . 47
4.3 Simulation Result . . . . . . . . . . . . . . . 52

5 Hardware Implementation 56
5.1 Introduction to TSMC6711-DSK and Peripheral . . .56
5.1.1 Overview. . . . . . . . . . . . . . . . . .56
5.1.2 Key Features. . . . . .. . . . . . . . . . .59
5.1.3 CPU Description and Memory Map.. . . . . . .61
5.1.4 Timer and Interrupt. . . . . . . . . . . . .64
5.1.5 RS232 Interface . . . . . . . . . . . . . .67

5.2 Modem Hardware . . . . . . . . . . . . . . . . .69

6 Conclusion 76

Bibliography 83
[1] “ A FAMILY OF 2-WIRE, DUPLEX MODEMS OPERATING AT DATA SIGNALING RATES OF UP TO 9600 bit/s FOR USE ON THE GENERAL SWITCHED TELEPHONE NETWORK AND ON LEASED TELEPHONE-TYPE CIRCUITS ”, ITU-T Recommendation V.32, Mar. 1993.

[2] John A. C. Bingham “ THE THEORY AND PRACTICE OF MODEM DESIGN ”, john Wiley & Sons, Inc. 1988.

[3] Mansoor A. Chishtie. “ Viterbi Implementation on the TMS320C5x for V.32 Modems ” Texas Instruments, DSP Applications, 1996.

[4] Henry Yiu. “ Implementing V.32bis Viterbi Decoding on the TMS320C62xx DSP ”, Texas Instruments, DSP Application Report: SPRA444, 1998.

[5] Wesolowski, K. “ Receiver structures for trellis-coded multipoint QAM signals transmitted through dispersive channels ”, IEEE Circuits and Systems, 1988, Page(s): 1561 ~ 1564 vol.2

[6] N Dahnoun and D R Clewer. “ The Implementation of a modem Based on Quadrature Amplitude Modulation Using the TMS320C6201 DSP ”, DSP Chip in Real-Time Instrumentation and Display System. IEE Colloquium on 1997. Page(s): 5/1 ~ 5/6.

[7] Al Lovrich and Raj Chirayil “ An All-Digital Automatic Gain Control ” Texas Instruments, DSP Application report: SPRA081, 1997.

[8] Sangil Park and Dion Messer “ Analysis and Digital Implementation of Jointly Adaptive Echo Canceller, Transversal Equalizer and Decision Feedback Equalizer for V.2 Modem”, IEEE Acoustics, Speech, and Signal Processing, 1991, ICASSP-91, Page(s): 1965 ~ 1968 vol.3.

[9] Zerguine A., Bettayeb M. and Cowan C.F.N. “Hybrid LMS-LMF algorithm for adaptive echo cancellation ”, Vision, Image and Signal Processing, IEE Proceedings, Volume: 146 Issue: 4, Aug. 1999, Page(s): 173 ~ 180.

[10] William G. Cowley and Lesley P. Sabel. “ The Performance of Two Symbol Timing Recovery Algorithm for PSK Demodulators ”, IEEE Trans. Commun, Vol. 42 No. 6, JUNE. 1994.

[11] Zhang Hang and Markku Renfors. “ A Study on Symbol Synchronization for QAM Systems ”, IEEE Proceedings of the 38th Midwest Symposium on Volume: 2, 1996, Page(s): 949 ~ 952 vol. 2 No. 9, Sep. 1996.

[12] SAID MORODO and HIKMET SARI. “Analysis of four Decision -Feedback Carrier Recovery Loops in the Presence of Intersymbol Interference ”, IEEE Trans. Commu, Vol. Com-33, No. 6, JUNE. 1985.

[13] “ TMS320C62x/C67x CPU and Instruction Set ”, Texas Instruments, Reference Guide, Mar. 1998.

[14] “ TMS320C6000 Peripherals ”, Texas Instruments, Reference Guide, April. 1999

[15] “ TMS320C6711, TMS320C6711B FLAOTING-POINT DIGITAL SIGNAL PROCESSORS ”, Texas Instruments, Revised Datasheet: SPRS088B, Sep. 2001.

[16] Carlos A.P.N. Solis “ Setting Up TMS320C6201 Interrupts in C ”, Texas Instruments, DSP Application report: SPHA001.

[17] Turner, S.E. “ Passband echo cancellation techniques for high-speed modem applications”, Data Transmission - Advances in Modem and ISDN Technology and Applications, 1992, International Conference on, Page(s): 41 ~ 46.
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