Báo cáo hóa học: "Research Article A Fast LMMSE Channel Estimation Method for OFDM Systems" ppt

... applications with fast varying fading channels. And most practical communication systems such as World Interoperability for Microwave Access (WIMAX) system adopt pilot assisted channel estimation, ... conventional LMMSE method cannot track the channel. Once the channel parameters change, the performance of the conventional LMMSE method will degrade due to the parameter mism...

Ngày tải lên: 21/06/2014, 22:20

... slots before issuing a DSC packet. Once again, it Table 1: Relevant simulation parameters. CSMA/CA PHY layer and 2C-WSN Parameter Value Parameter Value macMinBE 3 Radio datarate 250 kbps macMaxBE ... ends before attempting channel access. Thus, the 2C algorithm is able to provide guarantees for fair channel access. Each station participating in a CRI maintains a counter that contr...

Ngày tải lên: 21/06/2014, 11:20

... Yokohama, Yokohama, Japan, 2000. 2 L C. Ceng and J C. Yao, “Relaxed viscosity approximation methods for fixed point problems and variational inequality problems,” Nonlinear Analysis: Theory, Methods ... Nonlinear Analysis: Theory, Methods & Applications, vol. 69, no. 8, pp. 2445–2457, 2008. 4 L C. Ceng and J C. Yao, “An extragradient-like approximation method for variational ineq...

Ngày tải lên: 21/06/2014, 20:20

... extracted watermark can reflect this simple fact (that the already watermarked image (or image area) has been altered further) [2]. Hence, a watermark for authentication is classified as a fragile watermark. This ... other areas of the same image. Therefore, a block and its backup block may both be tampered at the same time if a watermarked image is tampered extensively in a large a...

Ngày tải lên: 21/06/2014, 22:20

... measures the average fraction of labels 14 EURASIP Journal on Advances in Signal Processing [20] Y. Yang, “An evaluation of statistical approaches to text categorization,” Journal of Information ... present a Bayesian multilabel k- nearest neighbor (MLkNN) approach where, in order to assign a set of labels to a new instance, a decision is made separately for each label by taking int...

Ngày tải lên: 21/06/2014, 05:20

... the bigram-PLSA models an unfair advantage by allowing them to adapt the model parameters to the test data. Nevertheless, we applied it to avoid overfitting. To have a valid comparison, the PLSA and ... in language modeling. Latent topic modeling approaches such as Latent Semantic Analysis (LSA) [1, 2], Probabilistic Latent Semantic Analysis (PLSA) [3], and Latent Dirichlet Allocation (LDA)...

Ngày tải lên: 21/06/2014, 08:20

... cooperate with people as capable partners, that are able to learn from natural human instruction and that are intuitive and engaging for people to interact with, but that are also able to simultaneously ... left images of several image pairs of an image sequence perceived from a stationary binocular camera head. Although the index values below each image are not consecutive, all image pai...

Ngày tải lên: 21/06/2014, 09:20

... Speed-Adaptive Media-Data Encryption (SAME) Statistical char acteristics of compressed audio/video data are dramatically different from the ones of text data, because the variable-length codes and other ... Journal on Wireless Communications and Networking 5 original data. Statistical analysis in [ 12] shows that the coded data have high randomness at the byte level. Based on this statistical...

Ngày tải lên: 21/06/2014, 11:20

... Wireless Systems, Barcelona, Spain, May 2010. [20] I. Askoxylakis, K. Markantonakis, T. Tryfonas, J. May, and A. Traganitis, A face centered cubic key agreement mechanism for mobile ad hoc networks,” ... following: there are two parties A, B that share a password P.Bothpartiesuse a suitable symmetric cryptosystem but entity A has also the ability to create a random asymmetric ke...

Ngày tải lên: 21/06/2014, 11:20

... the network performance parameters are evaluated, for example, packet delay and loss ratio. 5.1. Raw Signal Level. It is fundamental for HINT to acquire the internal signals accurately inside a sensor ... Conference on Sensor and Ad Hoc Communications and Networks (SECON ’04), Santa Clara, Calif, USA, October 2004. [7] S. Park, A. Savvides, and M. B. Srivastava, “SensorSim: a simulat...

Ngày tải lên: 21/06/2014, 17:20