Báo cáo hóa học: " Research Article An Adaptive Channel Model for VBLAST in Vehicular Networks" doc

... proposed channel model, shown in Figure 1,isbased on the elliptical channel model first introduced in [2]. The original model was intended for modelling a mobile to basestation channel in a microcell, ... Communications and Networking 2. An Overview of Existing Channel Models Several models have been developed to approximate the mobile wireless channel. The main paramet...

Ngày tải lên: 21/06/2014, 23:20

... uplink systems which include time- varying channels in high speed environments. The variations of channel taps are tracked jointly by Kalman filter in time domain during training symbols. Since channel ... the changes within a single training symbol; therefore, these estimates are mandatory for interpolating the values in between because the channel might vary significantly from o...

Ngày tải lên: 21/06/2014, 22:20

... our analysis is in the frequency domain, however, we will make use of complex vectors and matrices for analytical pur- poses. 2. AN ADAPTIVE ALGORITHM FOR MAINTAINING PARAUNITARY CONSTRAINTS In ... required in an online adaptive estimation setting depends on the cost function being optimized. As we will show, in some cases asingleupdateof this pro- cedure per time instant...

Ngày tải lên: 22/06/2014, 23:20

... subset of information for further processing by another part of the information processing sys- tem. In the particular case of visual information, this c an be translated as “looking at something to ... University. His research interests and publications have been focused on image processing, analysis, annotation, search, and re- trieval; human and computer vision; video processing an...

Ngày tải lên: 22/06/2014, 23:20

... necessarily coincide with any S k CL ,fori, k>W d . In the predeployment phase, that is, during manufacture, the sensor nodes are preconfigured with an initial default sampling period S d and an initial ... Temperature Attacks. In order to de-synchronize some nodes, an attacker may select a location and rapidly vary the temperature in the surroundings of one or group of BANs. F...

Ngày tải lên: 21/06/2014, 05:20

... on Advances in Signal Processing 13 [21] K. Tan, K. Killourhy, and R. Maxion, “Undermining an anomaly-based intrusion detection system using common exploits,” in Proceedings of the 5th International ... (INFOCOM ’06), pp. 1–12, Barcelona, Spain, April 2006. [34] K T. Chen, C Y. Huang, P. Huang, and C L. Lei, An empirical evaluation of TCP performance in online games,” in Proceeding...

Ngày tải lên: 21/06/2014, 22:20

... Applications Chung-Liang Chang and Jyh-Ching Juang Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan Correspondence should be addressed to Chung-Liang Chang, ngj567.liang@msa.hinet.net Received ... signals for in nite, 16 MHz and 8 MHz bandwidths. An analysis of the in uence of coherent and noncoherent GPS receiver code tracking architecture on t...

Ngày tải lên: 21/06/2014, 22:20

... (QAP). HC can access channel after waiting for a time which is shorter than each AIFS and DIFS. Thus, HC can get the channel in both CFP and CP. During CP, TXOP foreachstationcanbereceivedintwoways:byusing EDCA ... beginning of the D j i .Thisleadsto improve the channel efficiently by letting the others to use the channel. This prevents packet dropping and channel wasting simultane...

Ngày tải lên: 22/06/2014, 01:20

... pages doi:10.1155/2007/64238 Research Article An Adaptive Time-Spread Multiple-Access Policy for Wireless Sensor Networks Konstantinos Oikonomou 1 and Ioannis Stavrakakis 2 1 Department of Informatics, Ionian University, ... cer tain destination in the network (the sink node), while in ad hoc networks the destination of the data can be any node. Depending on the particular ad ho...

Ngày tải lên: 22/06/2014, 19:20

... probability in error-prone applications is discussed. Aiming at improving the overall performance of the underlying joint source -channel coding, the combination of the packet size, interleaver, and channel coding ... coding. In addition, the minimum distance for each packet size and interleaver can be precom- puted and stored instead of computing it for each param- eter combinatio...

Ngày tải lên: 22/06/2014, 19:20