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Design and Simulation of QAM System
Communcation Engineering Major Lin Long
Abstract : Communication engineering is an important subject in the field of information construction, it is a major project of network communication, optical fiber transmission and mobile communication. Now with the continuous optimization and upgrading of optical fiber transmission and the rise of the 4G network and the rapid development of communication engineering has made outstanding achievements. In this paper, the development status and development characteristics of communication engineering, the development prospects of the communication engineering are discussed in detail..
Key words: Development Communications; Technical Characteristics; envisioned future;
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1??
1.1?????? 1.1.1???? 1.1.2???????? 1.1.3????????? 1.1.4?????? 1.1.5?????? 1.2. ??????
1.3 ??????????? 1.4????????
1.5??????????????????? 1.6????????????? 1.7????????????? ?? ???? ??
?????????
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?1? ????????? 3
1.1 ????????? 3
1.2 ??????? 4
1.2.1 ???????? 4
1.2.2 PWM?? 5
1.2.3 ??????????? 5
1.3 ??????? 5
?2? ??????????? 6
2. 1 ???????? 6
2. 2 ??????? 6
2.3 ?????????????????6
2.3.1?????????? 6
2.3.2 ?????? 7
2.3.3 ????????10
2.3.4 SPWM???????11
2.3.5 ???????????12
2.3.6 ???????????13
2.3.7 ?????????? 14
?3? ??????? 15
3.1 ??????15
3.2 ??????15
3.3 ???PI????? 16 ? ? 18 ????19
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4?????5????;
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n1=60f/p(r/min)(1-1)
???f????????????50Hz?
p?????
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s=(n1-n)/n1*100% ?1-2???????????????n=0???s=1?????????n=n1??s=0??s?0?1??????????????????s=?1?6???
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n=60f(1-s)/p ?1-3?
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???????????????????????????????TI???MCS320F240?DSP????????????????????????????????????????????????????
1.2.2 PWM??
PWM?????????????????????????????????PWM???????????????PWM??????????????????????????????????????????????????????????????????????PWM?????????????????????????
1.2.3 ???????????
???????????????????????????????????????????????????????????????????????????????????????????3000V????????????6000V?10000V??????????????????????????????????????????????????????????
1.3 ???????
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1. ??????????????????
2. ???????? ??????????????????????1000??????????????610KV??????
3. ????????????????????????????????????????????????????????????????????
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QAM??????????
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2014? 4 ? 10 ?
QAM??????????
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[? ?]??????QAM?????????????????????????????????????????????????????????????????????????????QAM??????????????????????QAM???????Simulink???????????????????????????????????????Simulink????????????????????QAM????????Matlab/Simulink???????????????????????QAM????????????????????
[? ? ?] ???????????????????????
Design and Simulation of QAM System
Communcation Engineering Major Lin Long
Abstract : Quadrature amplitude modulation is a joint-controlled digital modulation technology of phase and amplitude. It is widely used not only in the mobile communication field, but also in other fields, such as wire television transmission field, digital video broadcasting, satellite communication, etc... This paper studies the basic principles of QAM modulation and demodulation, then simulates the whole 16QAM system and discusses performances of system by the simulink toolbox. This paper also analyses the basic principles and implementation method on digitalizing analog signals, then
simulates the DPCM system and contrasts performances of system. At last, this paper designs a QAM transmission system of analog sources, then simulates the whole transmission system and comparing performances of system. The simulation shows analog signals can be transmitted correctly in the system designed in this paper.
Key words: digital
modulation; differential
simulate
transmission; quadrature amplitude pulse code modulation; model and
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1?? ..................................................... 1
1.1 ????????? .................................. 1
1.1.1 ??????????? ......................... 2
1.1.2 ????????????? ..................... 2
1.2 QAM?????????????????? ............. 3
1.3 ?????? ........................................ 4
1.4 ??????????? .............................. 4
2 QAM?????????Simulink?? ....................... 5
2.1 QAM?? ............................................ 6
2.1.1 QAM???? .................................... 6
2.1.2 QAM???? .................................... 7
2.1.3 QAM??? ...................................... 9
2.2 QAM?? ........................................... 11
2.3 QAM???????Simulink?? ..................... 11
2.3.1 16QAM???????Simulink?? .............. 11
2.3.2 64QAM???????Simulink?? .............. 13
2.4 MQAM???????????? ....................... 15
2.4.1??????? ................................. 15
2.4.2 ????? .................................... 16
2.4.3 ??????? ................................ 18
2.5 ???? ........................................... 19
3??????????Simulink?? ........................ 19
3.1 ?????? ....................................... 19
3.2 ???????? ................................... 20
3.2.1 DPCM??????? ............................ 20
3.2.2 ????? .................................... 21
3.2.3 DPCM??????? ............................ 24
3.3 DPCM?Simulink?? ................................ 25
3.4 ???????????????? ................... 26
3.4.1 ???????????? ...................... 26
3.4.2 ????????? ............................ 27
3.4.3 ?PCM???????? ........................ 29
3.5???? ........................................... 29
- I-
4 QAM?????????? ................................. 30
4.1 ??QAM???? ................................... 30
4.1.1 ???????????? ...................... 30
4.1.2 QAM??????? ............................. 31
4.2 QAM??????? .................................. 32
4.3 ??????? ..................................... 35
4.4???? ........................................... 36 ????????? ........................................ ???? .................................................. ?? ......................................................
- II- 37 38 38
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发表于 2019-9-13 23:46:11