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Modulation and Demodulation Technology in HF Communication

Author: HeWei
Tutor: DuShuanYi
School: Xi'an University of Electronic Science and Technology
Course: Communication and Information System
Keywords: CPM demodulation HF parallel system simulation DSP
CLC: TN925
Type: Master's thesis
Year: 2008
Downloads: 111
Quote: 0
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Abstract


In HF communications system , there are a great variety of modulation methods,such as PSK,FSK,FM and so on.On the base of analyzing these methods, Continuous Phase Modulation (CPM), an efficient modulation which developed very quickly in recent years, is mainly researched in this thesis. Compared with other modulations, CPM is of a higher bandwidth and power efficiency, which makes it gain more and more attention now.The key point of this thesis lies in two parts. In the first part, on the base of the CPM signal’s modulation and demodulation principle, the characters of CPM signal are discussed.Then the modulation and capture about one kind of CPM signal is realized in the hardware platform of DSP-TMS320VC33, and its performance is analyzed. Finally one demodulation method of the multiple system CPM signal is proposed. On the base of the Matlab simulation, the feasibility of this method is proved, and its advantage and disadvantage are given. In the second part, firstly HF parallel system standard is researched. Secondly each module of the parallel system’s transmitter is analyzed and the entire transmitter is realized in the hardware platform of DSP-TMS320C6000. Finally the keystone and difficulty in the realization process are also discussed.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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