multicarrier cdma in indoor wireless radio networks

... localized 28 Đồ án Localization in the wireless sensor networks Hình 4.1 Thuật toán Min-Max P = [min(x i +d i ),min(yi +d i )] P2 = [max(x i -d i ),min(yi +d i )] P3 = [min(x i +d i ),max(yi -d i )] ... thương mại, hỗ trỡ hiệu cho trình định Đồ án Localization in the wireless sensor networks 10 Đồ án Localization in the wireless sensor networks CHƯƠNG II ỨNG DỤNG MẠNG CẢM BIẾN KHÔNG DÂY 2.1 PHÁT ... Localization in the wireless sensor networks Hình 3.1 Định nghĩa loại nút tọa độ tương đối 18 Đồ án Localization in the wireless sensor networks Để có mô tả rõ ràng ,hình minh họa định nghĩa loại...

Ngày tải lên: 27/05/2014, 11:41

... behind Instead of deleting messages on transmission, CHARON retains them in a special state that does not allow further forwarding, except in the case that the node meets a sink Messages in this ... them, further reducing CPU energy consumption on the nodes 2.4 ZebraNet ZebraNet [3, 9] was a pioneering project in wildlife monitoring using WSNs, intended to allow tracking of individual wild ... routing efficiency through simulation results In this section, we extend and enrich CHARON analysis by discussing its performance in an experimental scenario involving real WSN nodes Beginning...

Ngày tải lên: 21/06/2014, 11:20

... on Wireless Communications and Networking nodes in the heterogeneous WSNs has been considered in [12, 13] In this paper, we investigate secure clustering of wireless sensor nodes with evaluating ... group key in sensor networks using elliptic curve polynomial,” in Proceedings of the 6th International Conference on Ad-Hoc, Mobile and Wireless Networks (ADHOC-NOW ’07), pp 153–171, Springer, 2007 ... contained in the minimum neighborhoods of the nodes [25] 6 EURASIP Journal on Wireless Communications and Networking 4.1 Secure and Survivable Routing In this subsection, we present the routing...

Ngày tải lên: 21/06/2014, 11:20

... attack and its countermeasure in wireless sensor networks, in 21st International Conference on Advanced Information Networking and Applications Workshops (AINAW), Washington, DC, USA, May 2007, ... that IEEE 802.11 networks [4] can significantly degrade the performance of Zigbee/802.15.4 networks when operating in overlapping frequency bands [3] The increasing demand for wireless communication ... required evolution in approaches to wireless network security, in 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications, (CrownCom), Singapore, May 2008,...

Ngày tải lên: 21/06/2014, 17:20

... approaches are mainly carried out in interference-free wireline and wireless networking scenarios However, due to the PUs’ presence in the context of CogMesh networks, the data flows including the control ... node in a dynamic CogMesh environment can be viewed as a reinforcement learning problem [14] In this section, we briefly explain the reinforcement learning agent in the Network Coding based Intercluster ... A Goldsmith, D Katabi, and M Medard, c “Joint relaying and network coding in wireless networks, ” in Proceedings of the IEEE International Symposium on Information Theory (ISIT ’07), pp 1101–1105,...

Ngày tải lên: 21/06/2014, 20:20

... attack and its countermeasure in wireless sensor networks, in 21st International Conference on Advanced Information Networking and Applications Workshops (AINAW), Washington, DC, USA, May 2007, ... that IEEE 802.11 networks [4] can significantly degrade the performance of Zigbee/802.15.4 networks when operating in overlapping frequency bands [3] The increasing demand for wireless communication ... required evolution in approaches to wireless network security, in 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications, (CrownCom), Singapore, May 2008,...

Ngày tải lên: 21/06/2014, 23:20

... that the total cost is minimized Draining problem is indeed a simplified version of the original scheduling problem By assuming that there is no new packet arrival, draining problem is much more ... Robin (RR) are first developed for wired networks Their original versions and improved versions (e.g., Weighted Round Robin and Deficit Round Robin [4]) are underlying schemes for wireless networks ... the wireless link variation The channel is simply described to be either in “good” or in “bad” state in this model A survey of this class of scheduling algorithms can be found in [1] Work in [8]...

Ngày tải lên: 21/06/2014, 23:20

... network In Section we concentrate on deriving some bounds for the load balancing problem The load balancing problem in wired networks is well known and provides some insight into this problem In particular, ... origin crossing the r-circle the intensity of the flow at any point of the circle is obtained by dividing by the length of the circumference, 2πr, resulting in intensity I(r, a; s) sΔs/r In the above ... · r2 − r1 (3) Note that in our setting at each point the information can flow to any direction (depending on the destination of each packet) in contrast to the sensor networks where it can be...

Ngày tải lên: 22/06/2014, 19:20

... 0.1 · I4 hereinafter according to measurement campaign processing Finally, T denotes the sampling period in (6) In (6) we have accounted for external information other than ranging In particular, ... to a single state point To avoid degeneracy, we apply resampling, consisting in eliminating particles with low importance weights and replicating those in high-probability regions [45, 46] In this ... different types can be incorporated into a single filtering algorithm In [9], authors tracked moving objects using various kinds of Bayesian filters From the wide range of wireless technologies...

Ngày tải lên: 21/06/2014, 17:20

... 0.1 · I4 hereinafter according to measurement campaign processing Finally, T denotes the sampling period in (6) In (6) we have accounted for external information other than ranging In particular, ... to a single state point To avoid degeneracy, we apply resampling, consisting in eliminating particles with low importance weights and replicating those in high-probability regions [45, 46] In this ... different types can be incorporated into a single filtering algorithm In [9], authors tracked moving objects using various kinds of Bayesian filters From the wide range of wireless technologies...

Ngày tải lên: 21/06/2014, 23:20

... invoked in the inverse operations in Figure for the OZFMUD, but not invoked in the inverse operations in Figure for the SZF-MUD In Figure the channel-dependent timevariant matrices are only invoked ... postprocessing matrix carrying out the coherent combining, such as the maximal ratio combining (MRC) It can be shown that, for the SZF-MUD using MRC, the weight matrix in ZF sense and the postprocessing ... the active users maintain unchanged In this case, the proposed SZFMUD having the processing matrices in (22) in fact has an implementational complexity that is similar to the singleuser MF receiver...

Ngày tải lên: 22/06/2014, 19:20

... according to the In the sleeping state, nodes can reach energy savings which are three orders of magnitude higher than those in the active phase [24] G Ferrari et al PAN coordinator Link Link Link ... sensor networks, ” in Proceedings of the 2nd International Workshop on Information Processing in Sensor Networks (IPSN ’03), pp 582–592, Palo Alto, Calif, USA, April 2003 [6] “IEEE 802.15.4 Std: Wireless ... in Figure 5(b), that is, with two RFDs talking directly to the coordinator intuition In Figure 12, the throughput results are obtained by averaging over the throughputs of each RFD, considering...

Ngày tải lên: 22/06/2014, 22:20

... namely, DS -CDMA and FHCDMA The problem concerns the presence of a user able to move without constraints in an indoor environment and provided with a wireless SDR-based receiver In particular, in this ... strength (RSS) The main approach to obtaining RSS is to apply filters for extracting power to a limited bandwidth in two ways [11]: a single filter with a sliding window that examines the entire bandwidth ... according to SR In general, MI can be blind or assisted [10], and modes can be superimposed in the same band or not In the blind approach, no previous information about the modes present in the...

Ngày tải lên: 23/06/2014, 01:20

... uses extra radios at every router 38 for providing protection As we noted earlier, the multi -radio interfaces cost more than single -radio interfaces By reducing the number of multi -radio interfaces ... is gaining rapid adoption worldwide, especially in emerging countries It operates in two modes: Point-toMultipoint (P2MP) and Mesh Mode (MM) In P2MP mode, WiMax is essentially used for single-hop ... addressed in the next chapter 2.2 Fault-tolerance in Wireless Mesh Networks Although there are many works that have been done on fault-tolerance provisioning techniques in wireless sensor networks...

Ngày tải lên: 01/10/2015, 11:39

... being In general there are three methods for processing these signals Known as linear combiners they are selection diversity, maximal ratio combining, and equal gain combining Under a certain ... available Maximal ratio combining and equal gain combining both use more than one path in two distinct ways In maximal ratio combining each branch signal is weighted (by ak) in proportion to its own ... co-phasing of the signals Conversely, equal gain combining does not weight each signal before combining (all ak = 1) In general, maximal ratio combining provides the best performance gain, followed...

Ngày tải lên: 20/11/2012, 11:36

... "Cryptography and Security in Wireless Sensor Networks, " FRONTS 2nd Winterschool Braunschweig, Germany, 2009 [26] Chris Karlof David Wagner In Secure Routing in Wireless Sensor Networks: Attacks and ... topologies used for sensor networks include star, mesh, star-mesh etc [2] In Wireless sensor networks there are two kinds of wireless nodes; sensor and base station nodes The main function of the base ... functionalities in terms of one base station participating in one system It is important to remember that with an increase in a sensor network there’s an increase in the distance separating the base...

Ngày tải lên: 05/03/2014, 23:20

... PROBLEM IN WSN In the preceding discussions, we introduced the notion of event-to-sink reliability in WSN and pointed out the inapplicability of existing transport solutions Before proceeding to ... varying reporting frequency rate It is observed from (1) and Fig that decreases with increasing This is because the number of samples received in a decision interval increases with increasing ... experienced in the last decision interval In conjunction with the reliability indicator , the sink at the end of decision determines the current network state interval and acts according to the rules in...

Ngày tải lên: 16/03/2014, 19:20

Ngày tải lên: 19/03/2014, 00:20

... risks in wireless hotspot networks In Security in Pervasive Computing, First International Conference (2003), pp 10–24 [33] N USSER , R., AND P ELZ , R Bluetooth-based wireless connectivity in an ... reverse-engineering can be accomplished with a reasonable background in communications and computer engineering It took a few days for a PhD-level engineer experienced with reverse engineering to ... Eavesdropping Range We measured the eavesdropping range in both indoor and outdoor scenarios by having the ATEQ VT55 trigger the sensors In both scenarios, we fixed the location of the USRP at the origin...

Ngày tải lên: 23/03/2014, 10:20

... multipleaccess fading channels in wireless sensor networks optimal and suboptimal estimators Xin Wang∗1 and Chenyang Yang1 School of Electronics and Information Engineering, Beihang University, Beijing 100191, ... communication SNR levels It is interesting to see that using more training symbols does not improve the performance of the MLE as expected, because inserting training symbols will reduce the energy ... sensors can transmit training symbols to facilitate channel estimation The training symbols can be incorporated into the message function c(x) Then, the MLE with training symbols available is...

Ngày tải lên: 18/06/2014, 22:20