Sun Wenfeng

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According to wave function x(t) = A cos(wt + φ), varying A, w, φ in the same symbol slot can make modulation more efficient and maybe more economic. QAFPM described in this paper is a new technique, which shows this idea. At that time, realization of QAFPM and comments on its advantage and disadvantage are also discussed in the last.
Now the traditional one-way transmission services of audio and video can not meet the needs of people, and so the two-way transformation of HFC network has become inevitable with the growth and development of the two-way transmission services of VOD, IPTV and so on. To begin with, the technology of HFC is introduced, and then the technology of EPON and EOC(More)
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