Jinyun Ren

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The von Mises distribution is a convenient model for directional scenarios owing to its circular support, simple bellshaped form, and smooth transition amongst many distributions. In this paper, we use the von Mises distribution as the angular power distribution to quantify the spacing for antennas to be uncorrelated. The results are well-defined and(More)
Mobile channels are often modeled using a well-defined Rice process. The statistics of its wrapped phase (i.e., phase values in [−π, π)), such as the mean, variance, and probability density function (pdf), are known. The absolute phase is the accumulated phase change over an observation interval. It can be calculated from the wrapped phase but contains more(More)
Simplified signal models of the bottom reverberation are widely used in the sonar literature, but the simplifications themselves are seldom discussed. In this paper, the formulation of the joint modeling of signal propagation, bottom scattering, and reception is reviewed, and an emphasis is placed on the assumptions which lead to model simplification. The(More)
A Rice factor (K) estimator is described which uses simple operations on the phase of the well-defined Rice channel. Multiple receive channels, such as used in MIMO communications, enable spatial sampling which enhances the accuracy. For an example configuration of four uncorrelated receive antennas with a ten wavelength linear trajectory in isotropic(More)
The inverse discrete Fourier transform (IDFT) technique has been used for simulating mobile channels in 2D isotropic scenarios because of its speed and simplicity. For simulating channels in directional scenarios, the IDFT can still be used, but it is not well developed. In this paper, a more generalized mobile channel simulator, using the IDFT, for(More)
The absolute phase has been identified as a new parameter for the mobile fading channel, and its statistics have been recently analyzed. This article reviews the absolute phase, in particular, in the context of signal and scattering models of mobile communications, and presents measurements for three typical scenarios: strong LOS, weak LOS, and two-path(More)
Much signal processing in sonar takes advantage of ping-to-ping bottom reverberation coherence. However, bottom reverberation coherence is degraded owing to environment variations including unknown sonar sensor motions from platform instability. In this paper, an algorithm is described to compensate small-scale motion of high-frequency sonar sensors which(More)
The absolute phase is the accumulated phase change over an observation interval. It is a new variable for the mobile channel and can be simply derived from the wrapped phase or from the quadrature components. The absolute phase offers extra information about the channel, fostering new techniques for channel characterization and location estimation. However,(More)
In this paper, a new Multifractal Wavelet Model (MWM) is studied and simulation results are presented. We conclude that MWM has captured most of the properties of network traffic and the computational complexity of MWM is only O(N). The efficiency of MWM makes it possible in the real-time applications. 1.Introduction Network traffic modeling is one of the(More)
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