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spectrum
(4623 results)-
Whitepapers
Cross-Layer Dynamic Rate Adaptations for Green Cognitive Radio Networks
November 21, 2012 12:00am PST
The authors investigate cross-layer rate adaptation techniques for a Secondary User (SU) equipped with a finite buffer in green Cognitive Radio networks. They assume that the activity statistics...
Provided by: Institute of Electrical and Electronics Engineers
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Whitepapers
Cognitive Access Policies Under a Primary ARQ Process via Forward-Backward Interference Cancellation
November 16, 2012 12:00am PST
This paper introduces a novel technique for access by a cognitive Secondary User (SU) using best-effort transmission to a spectrum with an incumbent Primary User (PU), which uses Type-I Hybrid...
Provided by: Aalborg University
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Whitepapers
Screen-Off Traffic Characterization and Optimization in 3G/4G Networks
November 16, 2012 12:00am PST
Today's cellular systems operate under diverse resource constraints: limited frequency spectrum, network processing capability, and handset battery life. The authors consider a novel and important...
Provided by: Association for Computing Machinery
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Whitepapers
Cognitive Radio Ad-Hoc Networks: Some New Results on Multi-Channel Hidden Terminal Problem
November 15, 2012 12:00am PST
Recently the Cognitive Radio (CR), in particular the CR Ad-Hoc Network (CRAHN) technology appears as a burgeoning area in wireless communication that enables utilization of limited network...
Provided by: Scientific Research
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Whitepapers
Globally Optimal Precoder Design With Finite-Alphabet Inputs for Cognitive Radio Networks
November 12, 2012 12:00am PST
This paper investigates the linear pre-coder design for spectrum sharing in multi-antenna cognitive radio networks with finite alphabet inputs. It formulates the pre-coding problem by maximizing...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
The Five Phases of Capture
November 8, 2012 12:00am PST
After more than 20 years, capture systems have evolved from simple solutions for basic scanning into very sophisticated - and expensive - systems for enterprise wide document automation. This...
Provided by: IBM
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Whitepapers
Service Response Time of Elastic Data Traffic in Cognitive Radio Networks
November 8, 2012 12:00am PST
Quality of Service (QoS) support over Cognitive Radio Networks (CRNs) is challenging due to the random spectrum availability. Elastic data traffic is a popular service whose service response time...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Design of Broadband W-Slotted Microstrip Patch Antenna
November 8, 2012 12:00am PST
In this paper, the authors presented to improve the bandwidth a W-slot technique is used, it is efficient to enhance the bandwidth of antenna. A broadband W-slot microstrip patch antenna is...
Provided by: International Journal of Electronics Communication and Computer Engineering
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Whitepapers
Energy- and Cognitive-Radio-Aware Routing in Cognitive Radio Sensor Networks
November 7, 2012 12:00am PST
Cognitive Radio Sensor Networks (CRSNs) are the next generation Wireless Sensor Networks (WSNs) that mitigate overcrowded unlicensed spectrum bands by opportunistically using temporally unoccupied...
Provided by: Hindawi Publishing
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Whitepapers
Distributed Execution of Cognitive Relaying with Time Incentive: Multiple PU Scenario
November 2, 2012 12:00am PDT
This paper deals in developing distributed algorithms for Cognitive Relaying with Time Incentive for Multiple primary users (CRTI-M). CRTI-M is a symbiotic paradigm in which the incumbent Primary...
Provided by: EURASIP
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Whitepapers
Multiuser Resource Allocation Optimization Using Bandwidth-Power Product in Cognitive Radio Networks
November 1, 2012 12:00am PDT
The authors developed a new resource allocation optimization framework for a single-cell multiuser multicarrier cognitive radio network in the presence of multiple primary networks. The framework...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Distributed Approach for Frequency Allocation Using Graph Coloring in Mobile Networks
November 1, 2012 12:00am PDT
The proposed technique explores a general framework for studying distributed frequency allocation in mobile cellular network. The problem can be abstracted as a multicoloring problem on a cellular...
Provided by: International Journal of Computer Applications
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Whitepapers
A Survey on Preventing Jamming Attacks in Wireless Communication
November 1, 2012 12:00am PDT
Communication in wireless network is possible with an air medium. Due to the high security threats in this system, the network may face various difficulties. One of the major threats is jamming...
Provided by: International Journal of Computer Applications
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Whitepapers
Characterization and exploitation of heterogeneous OFDM primary users in cognitive radio networks
November 1, 2012 12:00am PDT
The fundamental features of Cognitive Radio (CR) systems are their ability to adapt to the wireless environment where they operate and their opportunistic occupation of the licensed spectrum bands...
Provided by: SpringCM Inc
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Whitepapers
Study and Optimization of Cooperative Spectrum Sensing in OFDM Cognitive Radio Networks
November 1, 2012 12:00am PDT
In this paper, a cooperative sensing algorithm for OFDM is proposed in this paper based on the performance analysis of ONPD algorithm, then the system weight vector is optimized and the closed...
Provided by: International Journal of Computer Science Issues
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Whitepapers
Cognitive Relay Networks With Multiple Primary Transceivers Under Spectrum-Sharing
November 1, 2012 12:00am PDT
The authors examine the impact of multiple Primary Transmitters and Receivers (PU-TxRx) on the outage performance of cognitive decode-and-forward relay networks. In such a joint...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Cognitive Radio-Enabled Network-Based Cooperation: From a Connectivity Perspective
November 1, 2012 12:00am PDT
Cognitive Radio (CR) enables dynamic spectrum access to provide universal connectivity across different types of radio access technologies, realizing seamless content delivery in the next...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Implementation of Optical Performance Monitor Module Interfacing in DWDM System
November 1, 2012 12:00am PDT
The OPM module scans the optical spectrum of a multiplexed WDM signal and detects the channel count, power, frequency and OSNR of the individual channels. Purpose of this paper is to describe the...
Provided by: International Journal of Multidisciplinary Sciences and Engineering (IJMSE)
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Whitepapers
Survey of Related Technologies for Improved Spectrum Efficiency
November 1, 2012 12:00am PDT
The most noted effect of rapid growth in wireless networks in recent years has been the issues of spectrum usage and management because of its importance in wireless communication as the medium of...
Provided by: IOSR Journal of Engineering
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Whitepapers
Throughput Analysis and Spectrum Sensing Over Nakagami Fading in Cognitive Radio
November 1, 2012 12:00am PDT
The cognitive radio technology allows unlicensed users to utilize the licensed frequency band when it is idle. In this paper, the authors obtain a mathematical tradeoff between the number of...
Provided by: IJCSMR
