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Real-time user positioning and navigation services are widely used daily by millions of people. The challenge is that common global positioning systems fail in indoor environment or in scenes with a limited sky view. In the paper, the indoor navigation framework based on the Bluetooth beacons is proposed. Such system allows user to obtain the position in GPS denied environment on a real-time basis...
In this paper, we analyze properties of the noise in the time-frequency representations. We show that time-frequency representations can be improved by denoising. However, the task and conditions in which noise removal should be performed are not typical for filter design. We demonstrate that leaked noise has specific statistics and spatial correlation characteristics. Some opportunities of denoising...
A task of time delay estimation for wideband signals in non-Gaussian environment is considered. An approach based on application of robust DFT for obtaining spectrum estimates of sensor signals for observation interval is proposed and shown to perform better than conventional approaches for noise modeled as symmetric α-stable process.
The analysis task of image discrete cosine transform (DCT) coefficients in case of spatially correlated noise is considered. Several estimators of shape parameter of generalized Gaussian distribution based on the forth central moment as well as percentile coefficient of kurtosis are applied in the research. It is shown that spatially correlated type of noise considerably influences statistics of DCT...
The task of prediction practical efficiency of filtering on the basis of the discrete cosine transform (DCT) methods is considered. It is shown that it is possible to estimate the MSE values of images to be processed by means of calculation rather simple statistics of DCT coefficients. Moreover, the quasi-optimal value of threshold parameter for DCT filtering methods can be easy evaluated as well...
The estimation task of tail heaviness parameter p of generalized Gaussian distribution is considered. Two simple p estimators on basis of kurtosis and its robust modification, percentile coefficient of kurtosis, are proposed and their accuracy is analyzed. Based on the obtained results, two new p estimators are developed employing hard threshold and combination schemes. As a practical application...
A task of time delay estimation for wideband signals in non-Gaussian environment is considered. An approach based on robust processing of cross-spectrum estimates for elementary intervals is proposed and shown to perform better than conventional approach for noise modeled as symmetric α-stable process.
Meridian estimator for location determination for data samples obeying symmetric heavy tail distributions is considered. It is shown that such estimator should and can adapt to tail heaviness. Adaptation can be carried out by setting a tunable parameter δ proportional to data scale and dependent on tail heaviness. The latter property can be characterized by robust estimate of kurtosis. Experiments...
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