Based on the introduction of the theory of spread spectrum(SS) communication,this paper presents a scheme for applying SS technique in the electric power systems,aiming at solving the problems of the low reliability of data transmission in the traditional power line carier communication mode.It also...
SPREAD SPECTRUM COMMUNICATION SYSTEM AND ITS COMPONENTPROBLEM TO BE SOLVED: To provide a spread spectrum communication system varying a data rate by a comparatively simple mechanism.SATO SHINICHI佐藤 信一
the transmission side is a desired signal by multiplying a reception spread spectrum signal and a signal retarding the said reception spread spectrum signal at the reception side and extracting a low frequency component of the multiplied signal so as to obtain a demodulation signal and outputting it...
Direct sequence spread spectrum communication device and its method 与特定实施例相一致的一种直接序列扩频(DSSS)接收机(100)具有频率发生器(112),其生成本地振荡器信号而不使用压电晶体. Example consistent with a direct sequence s... 保罗·E·戈尔达伊,埃德加·H·卡拉维,弗雷德里克·L·马丁,... 被引量...
In this chapter we of course do not intend to cover the topic of spread spectrum comprehensively. We just want to lay the theoretical background of spread spectrum for a sufficient understanding of the CDMA technology and its application within UMTS. As in the foregoing chapters we have ...
Electromagnetic spectrum can be identified as a resource for the designer, as well as for the manufacturer, from two complementary points of view: first, because it is a good in great demand by many different kind of applications; second, because despite its scarce availability, it may be adva...
Operation of direct sequence spread spectrum coding and decoding. In this case, it can be seen that chip stream (a) is repeated in waveform (h). This is multiplied by (g) to give the waveform (i). Each group of four bits (as there are four bits in the chip code used in the ...
and as such its spectrum is much wider than that of the message that is already wide given that it is a sequence of pulses. This can also be seen by considering thatx(t) as the product ofm(t), andc(t), its spectrum is the convolution of the spectrum ofm(t) with the spectrum ...
spread spectrum WirelessCommunication SpreadSpectrum 1 Definition Spreadspectrumtechniquesspreadinformationoveraverylargebandwidth–specifically,aband-widththatismuchlarger thantheinverseofthedatarate.2 Origins “spreadspectrum”comesfromthemilitaryarea,wherethemain interestliesinkeepingcommunicationsstealthy,safefrom...
1 Wireless Communication SpreadSpectrum 2 Definition Spreadspectrumtechniquesspreadinformationoveravery largebandwidth–specifically,aband-widththatismuchlarger thantheinverseofthedatarate. 3 Origins “spreadspectrum”comesfromthemilitaryarea,wherethemain interestliesinkeepingcommunicationsstealthy,safefromintercept, an...