The effect of IF (intermediate frequency) analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift, large dynamic range of signal power and low Eb/No condition are difficult ...
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The effect of IF (intermediate frequency) analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift, large dynamic range of signal power and low Eb/No condition are difficult to deal with. The way of setting reference value of logarithmic power based AGC is discussed. Coherent accumulation and non-coherent accumulation are used for detecting, while signal's PDF and performance vs. accumulation times are derived mathematically. Experiment shows that with 60 KHz Doppler offset, Eb/No=0dB under QPSK/OQPSK, only 16 bits was consumed to detect the signal with 99.9% detection probability and 0.1% false alarm probability.
By using the bifurcation theory of planar dynamical systems to a generalized Camassa-Holm equation m(t) + c(0)u(x) + um(x) + 2mu(x) = -yu(xxx) with m = u - alpha(2)u(xx), alpha not equal 0, co, gamma are constant, whi...
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By using the bifurcation theory of planar dynamical systems to a generalized Camassa-Holm equation m(t) + c(0)u(x) + um(x) + 2mu(x) = -yu(xxx) with m = u - alpha(2)u(xx), alpha not equal 0, co, gamma are constant, which is called CH-r equation, the existence of peakons and periodic cusp wave solutions is obtained. The analytic expressions of the peakons and periodic cusp wave solutions are given and numerical simulation results show the consistence with the theoretical analysis at the same time. (c) 2005 Elsevier Ltd. All rights reserved.
The effect of IF(Intermediate Frequency)analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift,large dynamic range of signal power and low Eb/No condition are difficult to ...
The effect of IF(Intermediate Frequency)analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift,large dynamic range of signal power and low Eb/No condition are difficult to deal with. The way of setting reference value of logarithmic power based AGC is *** accumulation and non-coherent accumulation are used for detecting,while signal's PDF and performance *** times are derived mathematically. Experiment shows that with 60KHz Doppler offset,Eb/No=0dB under QPSK/OQPSK,only 16bits was consumed to detect the signal with 99.9%detection probability and 0.1%false alarm probability.
In this paper, we employ the bifurcation theory of planar dynamical systems to study the smooth and non-smooth traveling wave solutions of the generalized Degasperis-Procesi equation ut-uxxt+4umux-3uxuxx+uuxxx. with m...
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In this paper, we employ the bifurcation theory of planar dynamical systems to study the smooth and non-smooth traveling wave solutions of the generalized Degasperis-Procesi equation ut-uxxt+4umux-3uxuxx+uuxxx. with m∈N which is the well-known Degasperis-Procesi equation when m=1. We will show in this paper that the GDP equation also has the similar topological bifurcation phase portraits as
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