In this paper, we present a low-complexity power allocation scheme for non-regenerative (amplify and forward) relaying in cognitive radio systems. the main objective of the power allocation is to maximize the signal t...
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ISBN:
(纸本)9781424477425
In this paper, we present a low-complexity power allocation scheme for non-regenerative (amplify and forward) relaying in cognitive radio systems. the main objective of the power allocation is to maximize the signal to noise ratio (SNR) at the destination under the constraint of acceptable interference to the primary users (PU). In this paper, we propose an iterative power allocation using SNR upper Bound (IPAUB) for non-regenerative relaying. the proposed algorithm has low computational complexity, and we verify its effectiveness through simulation results.
作者：
An, XinPang, JunShandong Univ
Sch Comp Sci & Technol Jinan 250101 Shandong Peoples R China Univ Luxembourg
Comp Sci & Commun 6 Rue Richard Coudenhove Kalergi L-1359 Luxembourg Luxembourg
In the field of distributed computing, there are many round-based algorithms to solve fundamental problems, such as leader election and distributed consensus. Due to the nature of these algorithms, round numbers are u...
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ISBN:
(纸本)9780769540153
In the field of distributed computing, there are many round-based algorithms to solve fundamental problems, such as leader election and distributed consensus. Due to the nature of these algorithms, round numbers are unbounded and can increase infinitely during executions of the algorithms. this can lead to the state space explosion problem when verifying correctness of these algorithms using model checking. In this paper, we present a general idea of investigating the bounded distance of round numbers in round-based algorithms. We can manage to transform their state spaces into finite by maintaining such relations in a proper way, and thus make automatic verification of these algorithms possible. We apply this idea to several algorithms and present their verification results in the model checker Spin.
Absorbing the dynamics in production and to stabilize the production processes requires high efforts in order control. Today's IT-systems such as Enterprise Resource Planning (ERP) and Manufacturing Execution Syst...
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ISBN:
(数字)9783642104305
ISBN:
(纸本)9783642104299
Absorbing the dynamics in production and to stabilize the production processes requires high efforts in order control. Today's IT-systems such as Enterprise Resource Planning (ERP) and Manufacturing Execution systems (MES) are specialized in planning technical resources and optimizing deterministic sequences. Inconsistencies in planning have to be compensated by the operational staff at the latest. the vision of High Resolution Information Management (HRIM) is to build upon decentralized and adaptive control mechanisms for the workers in contrast to the traditional centralized control paradigm. In using context information, creating transparency through information and evaluating alternatives in the decision making process, the workers can better be enabled in handling the dynamic inherent in the system. the centralized structure of the companywide planning and control system will therefore not be abolished on the operational area but completed by decentralized self controlling structures.
this book constitutes the thoroughly refereed proceedings of the 6thinternational ICST conference, SecureComm 2010, held in Singapore in September 2010. the 28 revised full papers were carefully reviewed and selected...
ISBN:
(数字)9783642161612
ISBN:
(纸本)9783642161605
this book constitutes the thoroughly refereed proceedings of the 6thinternational ICST conference, SecureComm 2010, held in Singapore in September 2010. the 28 revised full papers were carefully reviewed and selected from 112 submissions. they are organized in topical sections on malware and email security, anonymity and privacy, wireless security, systems security, network security, and security protocols.
Cellular radio systems of the next generation will have to comply withthe IMT-Advanced guidelines. Advanced radio techniques must be integrated into wireless systems to achieve the high spectral efficiency numbers re...
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ISBN:
(纸本)9781424437092
Cellular radio systems of the next generation will have to comply withthe IMT-Advanced guidelines. Advanced radio techniques must be integrated into wireless systems to achieve the high spectral efficiency numbers required. Multiple antenna techniques such as MIMO are beneficial in regions of high SINR and low spatial stream correlation. Multihop techniques with fixed relays increase the throughput in regions close to the cell edge where SINR is typically low. Another challenge is the reuse-1 paradigm which worsens the interference situation. In this paper a mathematical model on system level is proposed and applied which allows to calculate system performance measures such as spectral efficiency. the MIMO model allows fast system evaluation without a lot of parameters and is therefore suitable for MAC layer simulative evaluation. the paper compares performance results for these techniques.
Wireless Personal Area Networks (WPANs) are used for a wide variety of applications. Earlier WPANs, like Bluetooth, offer data rates only for low rate communication. Nowadays, consumer electronic devices have high dem...
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ISBN:
(纸本)9781424477425
Wireless Personal Area Networks (WPANs) are used for a wide variety of applications. Earlier WPANs, like Bluetooth, offer data rates only for low rate communication. Nowadays, consumer electronic devices have high demands on communication systems, e. g. for high definition video transmission. Users expect future WPANs to act like wired systems by means of reliability, that is, packet loss and distortion. Multimedia systems are ubiquitous;hence, it can be expected, that future WPANs have to operate in dense network topologies. For that reason new technologies have to be evaluated in terms of interference mitigation and their ability to cooperate with Simultaneously Operating Piconets (SOPs). this paper focuses on Ultra Wideband (UWB) communication according to ECMA-368, called WiMedia. WiMedia's reservation-based medium access for high throughput and strict QoS requirements is evaluated taking inter-piconet interference into account. Strategies for distributed interference aware scheduling are proposed and examined by simulation to show system capacity for given scenarios.
the proceedings contain 10 papers. the topics discussed include: games ad hoc networks play;networking devices over TV white spaces;radio cover time in hyper-graphs;decomposing broadcast algorithms using abstract MAC ...
ISBN:
(纸本)9781450304139
the proceedings contain 10 papers. the topics discussed include: games ad hoc networks play;networking devices over TV white spaces;radio cover time in hyper-graphs;decomposing broadcast algorithms using abstract MAC layers;data transmission and base-station placement for optimizing network lifetime;bandwidth allocation in cellular networks with multiple interferences;information security for sensors by overwhelming random sequences and permutations;finding available parking spaces made easy;reliable neighbor discovery for mobile ad hoc networks;direction election in flocking swarms;and regional consecutive leader election in mobile ad-hoc networks.
Fourth Generation broadband wireless technologies such as WiMAX and LTE depend heavily in the performance of their schedulers to deliver high data throughput and meet quality-of-service commitments. this paper compare...
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We address the problem of computingthe information leakage of a system in an efficient way. We propose two methods: one based on reducing the problem to reachability, and the other based on techniques from quantitati...
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ISBN:
(纸本)9783642120015
We address the problem of computingthe information leakage of a system in an efficient way. We propose two methods: one based on reducing the problem to reachability, and the other based on techniques from quantitative counterexample generation. the second approach can be used either for exact or approximate computation, and provides feedback for debugging. these methods can be applied also in the case in which the input distribution is unknown. We then consider the interactive case and we point out that the definition of associated channel proposed in literature is not sound. We show however that the leakage can still be defined consistently, and that our methods extend smoothly.
Based on the approach of the 'social shaping of technology', this paper will provide a brief discussion of a) the impact that the individuals who populate a standards body's working group, and b) this body...
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ISBN:
(纸本)9789896740252
Based on the approach of the 'social shaping of technology', this paper will provide a brief discussion of a) the impact that the individuals who populate a standards body's working group, and b) this body's voting rules have on its final standards. It will primarily draw upon a qualitative empirical study. In particular, this paper will use the IEEE 802.11 group as a real-world sample group to further highlight the issues discussed more theoretically above.
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