外文文獻(xiàn)翻譯計(jì)算機(jī)及相關(guān)專業(yè)軟件實(shí)現(xiàn)2dpsk信號(hào)解調(diào)中英文對(duì)照-在線瀏覽
2025-02-08 05:19本頁(yè)面
【正文】 ion system. This paper presented an engineering method for demodulation of nonstandard 2DPSK signal. It is asoftware method which is lowercost than thetraditional method realized by hardware. For another benefit, it is very suitable for use in this puter age. 2 PhasseShift Keying PSK transfers datainformation by changing the phase of carrier. It is constituted of “absolute phase shift keying” and “parative phase shift keying”.There are differences between those two modulatedmethods: Absolute Phase Shift Keying describes data information directly by difference of carrier phase。While Comparative phase shift keying expresses data information by the parative change of carrier phase. Concerned demodulated method is the generalmethod to realize demodulation of 2DPSK signal. 2DPSK is a widely used modulation mode in digital munication region. The ideal 2DPSKprinciple and the mathematic expressing are we analyze the demodulation methods which are adopted recently. 科技文章 摘譯 2 3 Software Demodulation Of Ideal 2DPSK Signal The ideal waveform of Differential Phase Shift Keying signal is shown in the figure, it is obviously that the waveform has these characteristics: 1) At the sudden changed point of phase, thelength of the wave from the sudden changed point of phase to both sides(showed as da in Fig1) are two ti mes length of the half cycle((showed as db in Fig1)。It has this equition: ba NN ??2 aN :the number of points(type a) which sign is not change between the left crosszero point and right crosszero point。 Showing with the parameter in graph having this equition existence: ba dd ??2 From the analysis of the above, we can demodulate the ideal PSK signal by using thedifference of samplepointsbetweentwo crosszeropoints。 Then the sample points between the suddenphasechange points can be calculated。
研究報(bào)告相關(guān)推薦
鄂ICP備17016276號(hào)-1