The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An LP (Linear Prediction) spectrum modification method is proposed based on linear extrapolation for different signal to noise ratio under the white noise environment. A direct modification on the noisy LP spectrum is employed, since the autocorrelation coefficients of the original speech are not available in some practical applications. The linear suppression rule is applied into the high-frequency...
In this paper, a target detection technique based on the fusion of multipath signals in a Bayesian framework is proposed with application to the HF Over-The-Horizon-Radar (OTHR). The detection consists of a generalized likelihood ratio test and a data fusion process, where target measurement likelihood is derived based on a set of multi-path models which are characterized by a known Doppler transition...
Channel estimation is critical to the performance of a multiple-input multiple-output and orthogonal frequency-division-multiplexing (MIMO-OFDM) communication system. Current MIMO-OFDM channel estimation techniques suffer from either high complexity or poor performance. In fact, this issue has become one of the bottlenecks of a practical MIMO-OFDM system. This paper solves the problem by introducing...
This paper addresses the problem of musical noise introduced by conventional spectral subtraction method for speech enhancement. A modified spectral subtraction algorithm based on the masking properties of human auditory system is proposed. In comparison with Virag's algorithm, the modification of proposed method is made from four aspects. Firstly, VAD (Voice Activity Detection) is substituted by...
Multiple-antenna systems that operate at high rates require simple yet effective space-time transmission schemes. Linear dispersion (LD) codes transmits substreams of data in linear combinations over space and time. The traditionally LD codes are mainly designed to optimize the mutual information which cannot guarantee good error performance. In contrast, using the simulation-based optimization method...
The important scenery structure is embodied by the image border which carries the most important characteristic information of an image. Therefore, searching for a kind of better edge detection method which will apply to most images and have good anti-noise ability has become an urgent solution to this problem. The images containing different noise are detected by Cubic B-spline wavelet in this paper,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.