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tools & techniques
(23001 results)-
Whitepapers
Fast and Accurate PQoS Estimation Over 802.11g Wireless Network
April 18, 2008 12:00am PDT
The deployment of WLAN-based solutions for efficient distribution of multimedia content over wireless links is rapidly increasing in the last few years. Nevertheless many performance issues...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Game Theoretic Framework for Multipath Optimal Data Transfer in Multiuser Overlay Networks
April 18, 2008 12:00am PDT
In this paper, the authors study the problem of optimal data transfer over multiple overlay paths. Instead of solving the problem from the single controller point of view, they adopt the game...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Contourlet Based Image Compression for Wireless Communication in Face Recognition System
April 18, 2008 12:00am PDT
This paper proposes to use Contourlet transform for image compression and feature extraction for wireless face recognition system. The properties of face images and face recognition techniques are...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Practical Wavelet Domain LMK Algorithm for Predicting Multimedia Traffic
April 18, 2008 12:00am PDT
Wavelet transform is an emerging technique that has a significant advantage in analyzing time domain signals. When combined with LMS (Least Mean Square), wavelet based predictor can achieve better...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Robust Approach to Channel Estimation and Detection for Multicarrier Systems
April 18, 2008 12:00am PDT
Block transmission techniques have received much research interest recently for their ability to eliminate the inter-symbol interference problem associated with continuous transmission. Numerous...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Optimal Joint CFO and Channel Estimation for Multiuser MIMO-OFDM Systems
April 18, 2008 12:00am PDT
This paper addresses the problem of joint Carrier Frequency Offset (CFO) and channel estimation in multiuser Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing (OFDM)...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Least-Squares Channel Estimation Assisted by Self-Interference Cancellation for Mobile PRP-OFDM Applications
April 18, 2008 12:00am PDT
A Least-Squares (LS) Channel Estimation (CE) technique is investigated in this paper in order to apply Pseudo-Random-Postfix Orthogonal-Frequency-Division Multiplexing (PRP-OFDM) communications...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Repetition Code Subblocking for Partial Transmit Sequence OFDM
April 18, 2008 12:00am PDT
Partial Transmit Sequence (PTS) is a proven technique to reduce the Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems. It achieves significant PAPR...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Opportunistic Scheduling and Beamforming for MIMO-OFDMA Downlink Systems With Reduced Feedback
April 18, 2008 12:00am PDT
Opportunistic scheduling and beamforming schemes with reduced feedback are proposed for MIMO-OFDMA downlink systems. Unlike the conventional beamforming schemes in which beamforming is implemented...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Novel Technique for Efficient Hardware Simulation of Spatiotemporally Correlated MIMO Fading Channels
April 18, 2008 12:00am PDT
The authors present a fading model with a compact and fast hardware implementation suitable for correlated Rayleigh fading channel simulators. The proposed scheme is based on the sum-of-sinusoids...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Flexible VLSI Architecture for Extracting Diversity and Spatial Multiplexing Gains in MIMO Channels
April 18, 2008 12:00am PDT
The sphere decoding algorithm is able to approach Maximum Likelihood (ML) detection with significantly reduced computational complexity for Multi-Input Multi-Output (MIMO) communications. The...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Over-Complete Source-Mapping Aided AMR-WB MIMO Transceiver Using Three-Stage Iterative Detection
April 18, 2008 12:00am PDT
In this paper, the authors propose an iteratively detected Sphere Packing (SP) aided Differential Space-Time Spreading (DSTS) scheme using a Recursive Systematic Convolutional (RSC) code, for...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Neural Network Nonlinear MIMO Channel Identification and Receiver Design
April 18, 2008 12:00am PDT
Multiple-Input Multiple-Output (MIMO) systems have gained an enormous amount of attention as one of the most promising research areas of wireless communication. However, while MIMO systems have...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Novel Adaptive Antenna Array Based on Robust Semidefinite Programming
April 18, 2008 12:00am PDT
In this paper, a novel robust adaptive beamformer is proposed based on Semi-Definite Programming (SDP) and worst-case optimization. With the SDP formulation, the array output power and magnitude...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Maximum Ratio Combining Precoding for Multi-Antenna Relay Systems
April 18, 2008 12:00am PDT
This paper addresses the problem of design of practical communication strategies for multi-antenna amplify-and-forward and decode-and-forward relay systems. The authors show that simple linear...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Direction-of-Arrival Estimation of M - 1 Signals Based on Unitary-ESPRIT and Successive-Selection Technique With an M-Element Hexagonal Array
April 18, 2008 12:00am PDT
A method for full-azimuth DoA estimation of multiple signals with a hexagonal array is proposed. The DoA estimation is performed in two steps. In the first, a set of estimate candidates is...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
DS-CDMA Chip Waveforms With Maximally Concentrated Spectra
April 18, 2008 12:00am PDT
The authors propose chip waveforms for essentially full-response signaling in DS-CDMA systems that employ offset quadrature modulation formats. The waveforms are optimal in the sense that for a...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Dynamic Code Allocation for Constructive Interference Exploitation in DS-CDMA Systems
April 18, 2008 12:00am PDT
In this paper a new dynamic code distribution technique is presented. This method chooses the optimal code-to-user allocation for transmission between different combinations of the available...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Modified DVB-T System Architecture With Multi-Carrier Multi-Code Transmission and MPIC Based Reception
April 18, 2008 12:00am PDT
In this paper, the authors propose a modified DVB-T system architecture with a multi-carrier multi-code transmission format. The main techniques they use in the system include the orthogonal Walsh...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Wideband Spectrum Sensing in Cognitive Radio Networks
April 18, 2008 12:00am PDT
Spectrum sensing is an essential enabling functionality for cognitive radio networks to detect spectrum holes and opportunistically use the under-utilized frequency bands without causing harmful...
Provided by: Institute of Electrical & Electronic Engineers
