Distributed Detection of a Signal in Generalized Gaussian Noise

The problem of distributed detection of a signal in incompletely specified noise is considered. The noise assumed belongs to the generalized Gaussian family and the sensors in the distributed network employ the Wilcoxon test. The sensors pass the test statistics to a fusion center, where a hypothesis testing results in a decision regarding the presence or the absence of a signal. Three monotone and admissible fusion center tests are formulated. Restricted numerical evaluation over a certain parameter range of the noise distribution and the range of signal level indicates that these tests yield performances at comparable levels

Performance Study of Maximum-Likelihood Receivers and Transversal Filters for the Detection of Direct-Sequence Spread-Spectrum Signal in Narrowband Interference

Linear least squares estimation techniques can be used to enhance suppression of narrowband interference in direct-sequence spread-spectrum systems. Nonlinear techniques for this purpose have also been investigated recently. Here, we derive maximum-likelihood receivers for direct-sequence signal in Gaussian interference with known second order characteristics. It is shown that if the receiver uses samples from outside the bit interval, then the receiver structure (called ML II)is nonlinear. The bit error rate performances of these ML receivers are compared to those of linear receivers employing one-sided and two-sided least squares estimation filters, for the case of Gaussian autoregressive interference, It is shown that the ML II receiver outperforms the matched filter, the one sided and the two sided transversal filters

Kepuasan User Dan Evaluasi Website Ecommerce Kaskus the Largest Indonesian Community (Studi Pada User Kaskus Regional Malang)

Evaluation is an important part of quality control management system. There are stages in the evaluation process measurement and assessment. content and design is an application technology contained within the website. Evaluation of the content and design of an activity measurement and scoring against a web site based on certain criteria or standards to determine the quality or the quality of the web site. The purpose of the evaluation on a website not only know the extent to which the website content and design feasible, the evaluation can also provide feedback to managers about how far the level of user satisfaction on a website that has been built. The result showed the accuracy of information is one of the most important factors to determine the quality of website. In addition to the accuracy of the information, the depth and breadth of website content and design are key factors why website become the choice for millions of users, it should be maintained by the manager that the existence of the website not be displaced by other websites

Application of Expectation-Maximization Algorithm to the Detection of Direct-Sequence Signal in Pulsed Noise Jamming

We consider the detection of direct-sequence spread spectrum signal received in pulsed noise jamming enviromment. The Expectation- Maximization Algorithm is used to estimate the unknown jammer parameters and hence obtain a decision on the binary signal based on the estimated IikeIihood functions. The probability of eerror performance of the algorithm is simulated for a repeat code and a (7,4) block code. Simulation results show that at low signal to thermal noise ratio and high jammer power, the EM detector performs significantly better than the hard limiter and somewhat better than the soft limiter. Also, at low SNR, there is little degradauon as compared to the maximum-likelihood detector with true jammer parameters. At high SNR, the soft limiter outperforms the EM detector