Digital Modulation in Communications Systems—An Introduction（安捷伦资料，1R

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【文件名】:0898@52RD_modulation.pdf
【格　式】:pdf
【大　小】:493K
【简　介】:This application note introduces the concepts of
digital modulation used in many communications
systems today. Emphasis is placed on explaining
the tradeoffs that are made to optimize efficiencies
in system design.
【目　录】:
1. Why Digital Modulation?
1.1 Trading off simplicity and bandwidth
1.2 Industry trends
2. Using I/Q Modulation (Amplitude and Phase Control)
to Convey Information
2.1 Transmitting information
2.2 Signal characteristics that can be modified
2.3 Polar display—magnitude and phase represented
together
2.4 Signal changes or modifications in polar form
2.5 I/Q formats
2.6 I and Q in a radio transmitter
2.7 I and Q in a radio receiver
2.8 Why use I and Q?
3. Digital Modulation Types and Relative Efficiencies
3.1 Applications
3.1.1 Bit rate and symbol rate
3.1.2 Spectrum (bandwidth) requirements
3.1.3 Symbol clock
3.2 Phase Shift Keying (PSK)
3.3 Frequency Shift Keying
3.4 Minimum Shift Keying (MSK)
3.5 Quadrature Amplitude Modulation (QAM)
3.6 Theoretical bandwidth efficiency limits
3.7 Spectral efficiency examples in practical radios
3.8 I/Q offset modulation
3.9 Differential modulation
3.10 Constant amplitude modulation
4. Filtering
4.1 Nyquist or raised cosine filter
4.2 Transmitter-receiver matched filters
4.3 Gaussian filter
4.4 Filter bandwidth parameter alpha
4.5 Filter bandwidth effects
4.6 Chebyshev equiripple FIR (finite impulse response) filter
4.7 Spectral efficiency versus power consumption
5. Different Ways of Looking at a Digitally Modulated
Signal Time and Frequency Domain View
5.1 Power and frequency view
5.2 Constellation diagrams
5.3 Eye diagrams
5.4 Trellis diagrams
6. Sharing the Channel
6.1 Multiplexing—frequency
6.2 Multiplexing—time
6.3 Multiplexing—code
6.4 Multiplexing—geography
6.5 Combining multiplexing modes
6.6 Penetration versus efficiency
7. How Digital Transmitters and Receivers Work
7.1 A digital communications transmitter
7.2 A digital communications receiver
8. Measurements on Digital RF Communications Systems
8.1 Power measurements
8.1.1 Adjacent Channel Power
8.2 Frequency measurements
8.2.1 Occupied bandwidth
8.3 Timing measurements
8.4 Modulation accuracy
8.5 Understanding Error Vector Magnitude (EVM)
8.6 Troubleshooting with error vector measurements
8.7 Magnitude versus phase error
8.8 I/Q phase error versus time
8.9 Error Vector Magnitude versus time
8.10 Error spectrum (EVM versus frequency)
9. Summary
10. Overview of Communications Systems
11. Glossary of Terms

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Agilent培训教材
本文来自：我爱研发网(52RD.com) - R&D大本营
详细出处：http://www.52rd.com/bbs/dispbbs.asp?boardid=91&id=139116&replyID=96387

e340621

Agilent培训教材
本文来自：我爱研发网(52RD.com) - R&D大本营
详细出处：http://www.52rd.com/bbs/dispbbs.asp?boardid=91&id=139116&replyID=96387

e340621

Agilent培训教材
本文来自：我爱研发网(52RD.com) - R&D大本营
详细出处：http://www.52rd.com/bbs/dispbbs.asp?boardid=91&id=139116&replyID=96387

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