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(34157 results)-
White Papers
Exact BER Analysis for QAM Transmission on Arbitrary Fading Channels With Maximal-Ratio Combining and Imperfect Channel Estimation
July 1, 2008 12:00am PDT
To combat the detrimental effect of small-scale fading on the performance of wireless communication systems, several diversity techniques have been proposed to provide the receiver with...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Polarization Characteristics of Multiple-Input Multiple-Output Channels
July 1, 2008 12:00am PDT
In this paper, the authors investigate the polarization characteristics of the Multiple-Input Multiple-Output (MIMO) channels. The cross Polarization Discrimination (XPD) is found to change over...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Maximum Likelihood Based Methods for OFDM Intercarrier Spacing Characterization
July 1, 2008 12:00am PDT
One of the main task to be done by a cognitive receiver is to sensing its spectral environment in order to distinguish surrounding systems from each others. Actually most systems (such as WiMAX,...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
An Energy-Efficient Scheduling for Multiple MSSs in IEEE 802.16e Broadband Wireless
July 1, 2008 12:00am PDT
This paper proposes an energy-efficient traffic scheduling approach for 802.16e broadband wireless networks. Instead of considering a single Mobile Subscriber Station (MSS) as most of the current...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Improved Opportunistic Auto Rate Protocols for Wireless Networks
July 1, 2008 12:00am PDT
Currently a number of 802.11 based standards support multiple rates at physical layer and recently 802.11 MAC protocols have been modified to make use of these multiple rates. Two such mechanisms,...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Enhancements in Wireless Broadband Networks Using Smart Caching
July 1, 2008 12:00am PDT
Since ubiquitous mobile communication is already true in many countries in the future the provisioning of broadband access for mobile users is the key functionality. For mobile users the...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Efficient Cooperative Channel Sensing in Cognitive Radio Ad Hoc Networks
July 1, 2008 12:00am PDT
It is expected for multi-channel ad hoc networks to adopt Cognitive Radio (CR) technology since the CR technology can provide enough channels for high speed data transmission. These CR ad hoc...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Distributed Constant Bit Rate Slepian-Wolf Based Multiple Access Scheme With Nodes Having Common and Correlated Information
July 1, 2008 12:00am PDT
Practical implementation of video compression for distributed sources is currently an active research area. The distributed compression paradigm based on the Slepian-Wolf model has been proposed...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Soft Output Detector for Convolutionally Encoded Parity Bit Selected Multicarrier Direct-Sequence Spread Spectrum System
July 1, 2008 12:00am PDT
In this paper the authors investigate the performance of the Parity Bit selected MultiCarrier Direct Sequence Spread Spectrum (PB-MC-DS-SS) system using Log Likelihood Ratio (LLR). In this system...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
UFA: Ultra Flat Architecture for High Bitrate Services in Mobile Networks
July 1, 2008 12:00am PDT
The challenge in the coming years for mobile networks will be to offer high bitrate data services to customers in mobility. Future mobile architectures are being standardized to offer mobility...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
BER Analysis of MRC-OFDM Receiver With RF Impairments and Imperfect Channel State Information
July 1, 2008 12:00am PDT
In this paper, the authors investigate the effects of RF impairments and imperfect Channel State Information (CSI) on the performance of M-QAM Orthogonal Frequency Division Multiplexing (OFDM)...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Ontology-Based Context Inference and Query for Mobile Devices
July 1, 2008 12:00am PDT
The vision of service personalization for mobile communication environments entails context sensitive service provisioning. The realization of such customizable smart spaces necessitates...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Real Vs. Complex BPSK Precoding for MIMO Broadcast Channels
July 1, 2008 12:00am PDT
Recently the authors used asymptotic methods from statistical physics to analyze non-linear vector precoding for MIMO broadcast channels. They proposed to extend BPSK input alphabets onto both...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Game Theoretic Framework for Decentralized Power Allocation in IDMA Systems
July 1, 2008 12:00am PDT
In this contribution the authors present a decentralized power allocation algorithm for the uplink Interleave Division Multiple Access (IDMA) channel. Within the proposed optimal strategy for...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Free Deconvolution for OFDM Multicell SNR Detection
July 1, 2008 12:00am PDT
In this paper, a new multicell OFDM blind power detection method is proposed. Relying on recent results of free deconvolution, the authors' algorithm enables the terminal to count the number of...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
On the Secrecy Capacity of Frequency-Selective Fading Channels : A Practical Vandermonde Precoding
July 1, 2008 12:00am PDT
The authors study the secrecy capacity of the frequency-selective wiretap channel. Assuming that a guard interval of L symbols is inserted to avoid the inter-block interference and these symbols...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Opportunistic Interference Alignment in MIMO Interference Channels
July 1, 2008 12:00am PDT
The authors present two interference alignment techniques such that an opportunistic point-to-point Multiple Input Multiple Output (MIMO) link can reuse, without generating any additional...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Introducing Cognition in the Management of Equipment in the Future Wireless World
July 1, 2008 12:00am PDT
A key topic in the field of future wireless B3G/4G networks is related to mechanisms for the efficient complementary use of the different technologies. The goal is to exploit the multiplicity of...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Deterministic Approach for 2D-Doa Estimation Based on a V-Shaped Array and a Virtual Array Concept
July 1, 2008 12:00am PDT
The problem of estimating both the azimuth and elevation angles associated with narrow band plane waves using antenna arrays is comprehensively studied by many researchers. Various array...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Dynamic Data Aggregation and Transport in Wireless Sensor Networks
July 1, 2008 12:00am PDT
In wireless sensor networks, in-network aggregation is the process of compressing locally the data gathered by the sensor nodes, so that only the compressed data travel across several hops to...
Provided by: Institute of Electrical and Electronics Engineers
