[原创]Modulation for Wireless Communication

wicony

这个文档是讲用于无线通信的几种调制原理，包括OQPSK,pi/4QPSK,MSK and CPFSK调制技术。
Modulation for Wireless Communication 1
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 OQPSK - An Improvement for Wireless . . . . . . . . . . . . 8
4.2.1 OQPSK: A Solution . . . . . . . . . . . . . . . . . . . 10
4.2.1.1 Complex Envelope of Transmitted OQPSK . . . . . 12
4.2.1.2 OQPSK Receiver . . . . . . . . . . . . . . . . . . . 13
4.2.1.3 OQPSK Power Spectral Density . . . . . . . . . . . 14
4.2.2 Pi/4 -QPSK - A Variant of OQPSK . . . . . . . . . . . . 16
4.2.2.1 Method . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2.2 Constellation . . . . . . . . . . . . . . . . . . . . . 17
4.2.2.3 Comparison of O®set Methods . . . . . . . . . . . . 18
4.2.2.4 Complex Envelope . . . . . . . . . . . . . . . . . . 19
4.2.2.5 Di®erential Pseudo-Octonary QPSK . . . . . . . . . 20
4.2.3 Minimum Shift Keying (MSK) as a variant of OQPSK 24
4.2.3.1 MSK Signals and PSD . . . . . . . . . . . . . . . . 25
4.2.3.2 (Modi¯ed) MSK as a variant of FSK . . . . . . . . 26
4.3 Continuous Phase Modulation . . . . . . . . . . . . . . . . . 30
4.3.1 Introduction to CPFSK . . . . . . . . . . . . . . . . . 30
4.3.2 General CPM . . . . . . . . . . . . . . . . . . . . . . 40
4.3.2.1 Properties of CPM and its Trellises . . . . . . . . . 40
4.3.2.2 Power Spectrum of Full Response CPM . . . . . . . 53
4.3.2.3 CPM Modulators . . . . . . . . . . . . . . . . . . . 54
4.3.2.4 Demodulators { The Viterbi Algorithm and the Error
Probability . . . . . . . . . . . . . . . . . . . . . . . . 56

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