larger AIF for the three correction methods: 1.Magnitude averaging (black), 2. Rician correction (red), 3. Complex averaging (green). Figure 2. Gad concentration curves converted from the AIF signals (larger ROI) using different correction methods for SNR = 1.7. The true and complex averaging curves overlap. Figure 1. The relative errors (mean±SD) of the baseline signals to the true value for t...

Orthogonal Frequency Division Multiplexing (OFDM) plays a prominent role in wireless communication technology as multicarrier transmission scheme. The IEEE 802.11a standard uses coded OFDM scheme. This paper is to evaluate the performance of Coded OFDM system in different channels. Linear Block Code (LBC) with Extended Hamming is used to check the improvement of the system performance in BER (b...

Breaking the noise floor: A framework for correcting the noise-induced bias in noisy magnitude MR signals Cheng Guan Koay, Evren Özarslan, Peter J. Basser STBB / NICHD, National Institutes of Health, Bethesda, MD, United States MR signals are complex numbers where the real and imaginary components are independently Gaussian distributed [1]. The phase of the complex MRI signal is highly sensitiv...

The effect of correlated lognormal shadowing on the average probability of error performance of narrow-band wireless sensor network systems with microand macrodiversity reception in a Rician fading channel is investigated by considering a constant correlation model for the shadowed signals at the fusion center or sensor sink of wireless sensor network with radio channel. The performance degrada...

Approximate Symbol error rate (SER) expressions are derived for receive diversity system employing optimum combining, when both the desired and the interfering signals are subjected to Rician fading, for the case of a) equal power uncorrelated interferers b) unequal power interferers c) interferer correlation. The derived expressions are applicable for an arbitrary number of receive antennas an...

We here introduce an extension and natural generalization of both the κ-μ shadowed and the classical Beckmann fading models: the Fluctuating Beckmann (FB) fading model. This new model considers the clustering of multipath waves on which the line-of-sight (LoS) components randomly fluctuate, together with the effect of in-phase/quadrature power imbalance in the LoS and non-LoS components. Thus, ...

The Rician distribution of noise in magnitude magnetic resonance (MR) images is particularly problematic in low signal-to-noise ratio (SNR) regions. The Rician noise distribution causes a nonzero minimum signal in the image, which is often referred to as the rectified noise floor. True low signal is likely to be concealed in the noise, and quantification is severely hampered in low-SNR regions....

This paper presents an analysis of stability and resolution analysis of broadband (passive or active) array imaging in the Rician fading media. The main theoretical result is the stability condition KBN M where K is the Rician factor, B is the effective number of incoherent frequencies, N is the effective number of array elements and M is the number of sufficiently separated targets. The resolu...

Least Squares (LS) and its weighted version are standard techniques to estimate the Diffusion Tensor (DT) from Diffusion Weighted Images (DWI). They require to linearize the problem by computing the logarithm of the DWI. For the single-coil Rician noise model it has been shown that this model does not introduce a significant bias, but for multiple array coils and parallel imaging, the noise can...

Gabor lters have been applied sucessfully to a broad range of multidimensional signal processing and image processing tasks. The present paper considers the design of a single lter to segment a two-texture image. A new efcient algorithm for Gaborlter design is presented. The algorithm draws upon previous results that showed that the output of a Gaborltered texture is well represented by a Ricia...