lans in integrated radio networks

... optimal sensing time increases with increasing the reporting delay and decreases with increasing the instantaneous detection SNR Figure shows the maximum average throughput versus the reporting delay ... sensing in cognitive radio networks in Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC ‘07), 27–32 (2007) G Ganesan, Y(G) Li, Cooperative spectrum sensing in cognitive ... under different instantaneous detection SNR g It is clear that the maximum average throughput decreases with increasing the reporting delay and increases with increasing the instantaneous detection...

Ngày tải lên: 20/06/2014, 21:20

... or PU in service left), the waiting signaling is canceled for PUs in the primary system via the spectrum broker In the situation without waiting signaling, the proposed mechanism works in the ... probabilities in the NP mechanism is presented in Appendix B The main purpose of deriving the steady-state probabilities is to evaluate the performance metrics in the joint leasing and sensing-based ... in Proceedings of IEEE International Conference on Communications (ICC) 2010, Ottawa, Canada, 1–5 (May 2010) P Zhu, J Li, X Wang, Scheduling model for cognitive radio, in Proceedings of 3rd International...

Ngày tải lên: 20/06/2014, 22:20

... component of the emerging cognitive radio networks In this article, we Page of study the spectrum sensing problem jointly taking the fading and the location of SUs into account We obtain the overall ... section ‘Interference modeling’ section depicts the details of interference modeling Our simulation results are given in ‘Simulation results’ section Finally, we conclude this article in ‘Concluding ... Consequently, the spectrum sensing with jointly taking the fading and location of SUs into account is more suitable for the small scale network Concluding remarks Spectrum sensing is viewed as a crucial...

Ngày tải lên: 21/06/2014, 00:20

... J.-M Park, “Ensuring trustworthy spectrum sensing in cognitive radio networks, ” in Proceedings of the 1st IEEE Workshop on Networking Technologies for Software Defined Radio Networks (SDR ’06), ... probabilities Pr(T = ti ) as in (13), the expected average time of TCP source inactivity T after receiving an attack can be obtained as in ∞ T= ti · Pr(T = ti ) 3.7 Obtaining the TCP Inactivity Percentage ... freezing and nonfreezing TCP transmission Figures and clearly show that TCP throughput is higher when freezing TCP parameters than without freezing, since the TCP source remains inactive just during...

Ngày tải lên: 21/06/2014, 11:20

... Joint cooperative relay scheme for spectrum-efficient usage and capacity improvement in cognitive radio networks Qixun Zhang∗ , Zhiyong Feng and Ping Zhang Wireless Technology Innovation Institute ... Communications Ministry of Education, Information and Telecommunication Engineering of Beijing University of Posts and Telecommunications (BUPT), Haidian Dist Xitucheng Rd Beijing 100876, P.R China ∗ Corresponding ... designed to increase the spectrum usage efficiency and system capacity by dynamic tuning DyTSA ratio to adapt to the changing radio environment in multiple RNs serving multiple destinations scenario...

Ngày tải lên: 21/06/2014, 17:20

... to hard-decision reporting case Finally, current security issues in cognitive radio networks, including attacks and corresponding defense schemes, are concluded in [25] In this paper, we develop ... “Security in cognitive radio networks: threats and mitigation,” in Proceedings of the 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom ’08), Singapore, ... “Collaborative spectrum sensing for opportunistic access in fading environments,” in Proceedings of the 1st IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN ’05),...

Ngày tải lên: 21/06/2014, 19:20

... QoS in Integrated 3G Networks For a listing of recent titles in the Artech House Mobile Communications Series, turn to the back of this book QoS in Integrated 3G Networks Robert ... service in integrated 3G networks II Title III Series TK5103.483 L56 2002 384.5—dc21 2002021595 British Library Cataloguing in Publication Data Lloyd-Evans, Robert QoS in integrated 3G networks ... technology is introduced but the physical radio interface is retained In the second upgrade to WCDMA, the radio interface is totally changed In addition, cdmaOne offers advantages over GPRS in the short...

Ngày tải lên: 04/07/2014, 07:39

... Innovative Approaches to Spectrum Selection, Sensing, and Sharing in Cognitive Radio Networks by Chittabrata Ghosh B.Tech (Kalyani University, India) 2000 M.S (Indian Institute of ... occupancy in a single sub-band at any time instant can be determined by SUs in a cooperative manner [20] - [22] as opposed to being determined individually by each user [23] - [26] However, the instantaneous ... and beyond, integration and intercommunication of existing and future networks is not a far-sighted envision In recent years, different types of networks, like self-organizing ah hoc networks, ...

Ngày tải lên: 30/10/2014, 20:09

... is independent and identically distributed (i.i.d), and with zero mean and variance of N0 2.1.1 Binary Hypothesis Testing Spectrum sensing is a problem of binary hypothesis testing: determining ... genuine concern for me I want to thank the Department of Electrical and Computer Engineering, National University of Singapore I also thank the Institute for Infocomm Research for providing me ... prior information on the high probability that primary user is idle in cognitive radio networks, is proposed for spectrum sensing, assuming that primary signals are digitally PSK (Phase Shift Keying)...

Ngày tải lên: 10/09/2015, 08:28

... from interference canceling in the adaptive signal processing Besides, energy detection is not suitable in a multi-hop network scenario since transmissions from the neighboring SUs would interfere ... original inactive/active state after the spectrum sensing phase However, since the probability of this case is very small, thus we neglect it in the remaining part After the spectrum sensing, ... including cooperative coding, collaborative coding, and dirty paper coding, etc In addition, recent studies on overlay model have been summarized in [28] 1.3 Motivations and Challenges In traditional...

Ngày tải lên: 10/09/2015, 15:53

... limits for various fading CR networks, including single CR point-to-point channel, cognitive MAC, and cognitive OFDM systems For a single SU point-to-point fading channel, we investigate its ergodic, ... protection criteria instead of the conventional interference power constraint for spectrum sharing CR networks For a single SU point-to-point fading channel, we propose the PU outage constraint This new ... constraint and per user based interference power constraint 116 5.7 Conclusions 117 vi CONTENTS Sensing-based Spectrum Sharing in Fading CR Networks 118 6.1 Introduction...

Ngày tải lên: 11/09/2015, 10:15

... between a single RE and single REC The second is a multiple of point-to-point links between a single RE and a single REC, and the third is a multiple of pointto-point links between a single REC ... body networks, personal networks, vehicle networks, local area networks, and wide area networks In principle, these networks can be deployed to provide the infrastructure of ubiquitous networks ... adaptive predistortion techniques to TEAM LinG 30 Advances in Mobile Radio Access Networks increase the efficiency of power amplifiers while maintaining linearity Since the efficiency of the state-of-the-art...

Ngày tải lên: 18/04/2014, 10:43

... factors mainly act in response to certain conditions, for instance INO2 is activated in response to inocitol depletion and YAP1 is activated in H2O2 stress It has been argued that overexpressing a ... protein-protein interactions (PPI) and phosphorylation interactions (PhI) We searched in this network for regulatory path motifs, paths in the integrated network of length up to three occurring ... form a minority in the total perturbed set To examine the indirect modes of regulatory signal transfer, we considered an integrated physical network consisting of direct transcriptional interactions...

Ngày tải lên: 09/08/2014, 20:21

... routing as routing in IP/MPLS layer and optical layer are done one after another in sequence 2.2 Integrated Routing of LSPs in IP over WDM Networks In integrated routing, as described in chapter ... protection in IP over 14 WDM networks In Chapter 3, we develop two integrated routing algorithms: hop-based integrated routing algorithm (HIRA) and bandwidth-based integrated routing algorithm ... connections using integrated dynamic routing techniques is challenging In this thesis, we consider integrated dynamic routing of restorable connections We first develop two integrated routing algorithms:...

Ngày tải lên: 16/09/2015, 15:23

... tracing: activation of the incoming call tracing Centrex features: the PSTN-hosted voice call processing feature used by business customers (discussed in Chapter 6) Distinctive ringing: delivering ... forwarding—universal: unconditional forwarding of incoming calls to another number Call forwarding—call-waiting calls: forwarding incoming call-waiting calls to another number Call forward—remote ... Call blocking: blocking of certain outgoing calls by the subscriber Call pickup: answering a call to one line from another line location by using an access code Call transfer: transferring calls...

Ngày tải lên: 30/09/2013, 07:20

... Pipelining and Packetization The top line of the figure depicts a sample voice waveform and the second line is a time scale in 10 ms increments At T0, the CS-ACELP algorithm begins collecting ... backhauling, microwave links, and other factors found in carrier networks create many exceptions The other significant component of delay is from queuing within the wide-area network In a private ... only minimum buffering delay) In practice, over a number of network switch hops, it may not be necessary to assume the worst case The calculations in the following examples increase the initial...

Ngày tải lên: 11/12/2013, 14:16

... of innovation: networks of learning in biotechnology Administrative Science Quarterly 41: 116–145 Prelec D 2001 Readings packet on the Information Pump Including ‘Instructions for playing the Information ... knowledge discovery in databases—using data mining techniques—of databases containing external information Second, as a support (resource or Inter-organizational Networks capability) in a specific knowledge ... organization has to qualify by giving and receiving gifts Exchanging gifts means initiating and maintaining interactions It is not only digital products or services being affected by ‘gift economy...

Ngày tải lên: 24/01/2014, 00:20

... different, more random, way of separating the data into training and validation sets Failing this, you must combine the training and validation sets into one large training set Then new data must be ... data mining the programmer is not particularly sure what final outcome is being sought Neural networks are often employed in data mining to the ability for neural networks to be trained Neural networks ... of the “Flying Machine” To create a flying machine most of these inventors looked to nature In nature we found our only working model of a flying machine, which was the bird Most inventors who...

Ngày tải lên: 14/02/2014, 20:20

... access switch residing in the basement of a building aggregating user traffic within the building In a typical ETTx deployment, a building often consists of business users (in the ground floor) ... addition to assisting in spoofing prevention, the SC can also be used to pinpoint the origin of spoofing attacks For example, when a malicious user tries to contaminate the ARP table in the default ... controller (SC) as shown in Figure SC is typically part of the overall Network Management System (NMS), maintaining the subscriber profiles holding information including the service profiles...

Ngày tải lên: 05/03/2014, 23:20

... 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 ... key, and continue International Journal of Computer Science & Engineering Survey (IJCSES) Vol.3, No.3, June 2012 to use its old key In doing so, the base station will not be involved in the data ... papers in international journals and conferences in his areas of expertise He is the co-chair of the International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering...

Ngày tải lên: 05/03/2014, 23:20