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.
Spark has grown both in popularity and complexity in recent years. In order to use available resources in an efficient way, users need to understand how the behavior of their applications is affected by the size of the datasets and various configuration settings. Indeed, Spark allows users to specify many configuration parameters and understanding the impact of these choices with respect to the application...
Emerging high throughput wireless communication standards, such as LTE/LTE-A and IEEE 802.11ac, impose exciting challenges on SDR baseband implementations. Our work explores the feasibility of SDR baseband for the most demanding-modes in those emerging high throughput standards. On a customized C programmable SDR baseband processor (with compiler support), we have accomplished realtime inner receiver...
We address the radar high resolution range profile (HRRP) denoising problem for improving the recognition rate of HRRP at low signal-to-noise ratio (SNR). Gaussian white noise in HRRP return is suppressed by an approach based on sparse representation. A Fourier redundant dictionary is established for sparsely representing HRRP returns. An adaptive signal recovering algorithm, Orthogonal Matching Pursuit-Modified...
The architectural simplicity of the direct-conversion scheme makes it an appealing architecture for low cost and low power transceivers. This architecture however demonstrates increased sensitivity to analog front-end impairments, such as gain and phase imbalance in the transceiver's in-phase and quadrature (IQ) paths. Especially when used in flexible software-defined radios, very fast, but low cost...
It is important to detect and recognize the traffic sign for mobile robot localization and navigation. In this paper, an algorithm frame of feature detection and matching has been developed which includes shape detection, Harris corner detection, SIFT feature matching and robust estimation method. Firstly, the color threshold segmentation algorithm in RGB color space is adopted to get the candidate...
This paper proposes a fast full-chip synthesis methodology which can be built a custom Network-on-Chip (NoC) topology for NoC-based systems. The processors and their communications are synthesized simultaneously in the system-level floorplanning process. The proposed method leads to accurate area estimation, which makes an algorithm much more efficient than previous approaches. Moreover, the wirelength-aware...
Traditionally embedding parameters: embedding dimension m and delay time τ are determined separately in state space reconstruction of chaotic dynamical systems. While recently some researchers argued that delay time window τw = (m-1)τ should be determined first. In this paper we carry out a contrast test and come to a conclusion that m rather than τw is more crucial for the quality of reconstruction...
In this paper, under the non-local means framework, we propose a non-local bilateral filter algorithm for image denoising based on the neighborhoods' gray value and the corresponding neighborhoods' Gaussian curvature. We also adopt a new method to provide the optimum denoising parameter h based on the discrete wavelet transform and the smoothing spline estimation. Meanwhile the generalized cross-validation...
As Internet sustains high-speed development, its service quality, reliability and efficiency are taken into account once again. Some solutions are proposed. Network measurement technology can reflects operation condition of IP network and discover network abnormity in time which provides reference for orientation and discovery of network fault. Firstly, interval algorithm of packet pair and packet...
This paper proposes a method to develop the multinomial logit(MNL) model for a sequence of choices behavior that incorporates the probability of last choice in the current representative utility.The function of last probability could be additionally used as the coefficients of some part of observed component,while other alternative-specific coefficients are assumed to be variable only with their initial...
In this paper, we propose a constant pilot padding method (CPPM) that can perform both the timing synchronization and channel estimation in the orthogonal frequency division multiplexing (OFDM) systems. The CPPM method exploits the repetitive structure of the preamble generated by inserting the constant pilots in the frequency domain to execute the timing synchronization. In addition, the CPPM method...
Due to wavelet network with the advantage of multi-scale of wavelet and self-learning of neural network, it is widely applied in regression estimation. But it is seriously affected by the samples with gross error. Although M-estimation as object function can be used to solve the problem, its corresponding influence function is determined by the absolute value of error, thus a key problem is to choose...
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.