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Direction of arrival (DOA) is an important parameter to be measured in pulse compression radar (PCR) systems. It is more favorable for DOA estimation to be done after pulse compression, because the targets have been separated in range domain and usually have higher SNR. But after pulse compression, only a single snapshot is available in each range cell. As a result, conventional DOA estimation methods...
Recently proposed cooperative spectrum sensing method suggests that Cognitive Radio (CR) users can detect the primary users at low SNR with less time and higher accuracy through user cooperation. However, previous works assume CR users can acquire fully channel state information by pilot symbols, which is impractical. In this paper, the performance with imperfect channel estimation in cooperative...
Research of self-similarity has been the focus of flow prediction due to the complexity of self-similar traffic, but the LRD (long range dependence) traffic has the disadvantages of the high modeling algorithm complexity and poor precision. Therefore we tried to propose a way that can make the LRD traffic change to SRD (short range dependence) which is more simple than LRD in the field of modeling...
Due to the huge bandwidth of IR-UWB signal, its inherent frequency dependence characteristics makes the IR propagation undergo pulse distortions which are quite different compared with the narrowband system, especially in NLOS environment. As one of the most remarkable features, the potential easier material penetration properties of IR haven't had comprehensive studies. This paper summarizes the...
As one of the most important propagation mechanisms in ultra-wideband (UWB) indoor environment, reflection has its own characteristics due to the huge bandwidth of the UWB pulse. The inherent material dispersions represent the changes of permittivity and conductivity, etc. with frequency, which will cause UWB pulse undergoes waveform distortion in propagation, and furthermore affects the channel modeling...
A class of novel pulses based on modified Hermite functions (NMHPs) for UWB communications is presented according to spectral emission constraints of Federal Communications Commission (FCC) mask and the requirement of short pulse for multiple access. The proposed pulses constitute orthogonal sets and have a constant pulse width regardless of the order, moreover, have no DC component and have an adjustable...
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