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(34714 results)-
Whitepapers
Near-MAP Detectors Based on Probabilistic Data Association for Asynchronous MC-CDMA Systems
April 18, 2008 12:00am PDT
In this paper, the authors apply Probabilistic Data Association (PDA) to the detection of asynchronous users in the uplink of a MC-CDMA system. It is shown that the detection can be performed by...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Narrowband Interference Resilient Receiver Design for Unknown UWB Signal Detection
April 18, 2008 12:00am PDT
In this paper, the authors design a novel energy-detection based receiver architecture to detect unknown UWB signals in a strong Narrow-Band Interference (NBI) environment. Designed receiver is...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Linear Fractional Semidefinite Relaxed ML Approach to Blind Detection of 16-QAM Orthogonal Space-Time Block Codes
April 18, 2008 12:00am PDT
The blind Maximum-Likelihood (ML) detection of Orthogonal Space-Time Block Codes (OSTBCs) is a computationally challenging optimization problem. Fortunately, for BPSK and QPSK OSTBCs, it has been...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Near-Optimum Soft-Output Ant-Colony-Optimization Based Multiuser Detection for the DS-CDMA Uplink
April 18, 2008 12:00am PDT
In this contribution, a novel soft-output Ant Colony Optimization (ACO) based Multi-User Detector (MUD) is proposed for the synchronous Direct-Sequence Code-Division-Multiple-Access (DS-CDMA)...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Detection Algorithm for the Identification of the Free Spectral Resources in DVB-T Bands
April 18, 2008 12:00am PDT
In this paper, the authors propose an algorithm for detection of OFDM signals based on their second order statistics. They, therefore introduce a cost function and evaluate the impact of a...
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
Combining Eigen-Beamforming and Orthogonal Space-Time Block Coding for Secondary Usage of Spectrum
April 18, 2008 12:00am PDT
For a spectrum sharing environment, where an unlicensed (secondary) user coexists with a licensed (primary) user, the authors study the performance of the multi-antenna transmission scheme that...
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
Robust Adaptive Beamformer With LMI Constraints on Magnitude Response
April 18, 2008 12:00am PDT
In this paper, a novel robust adaptive antenna array with new Linear Matrix Inequality (LMI) constraints on the array magnitude response is proposed. Most of the advanced robust adaptive...
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
Antenna/Relay Selection for Coded Wireless Cooperative Networks
April 18, 2008 12:00am PDT
In this paper, the authors consider distributed coding for wireless cooperative networks with antenna/relay selection. The aim of this of paper is to find ways to improve the reliability of the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Finite-Resolution Digital Receiver Design for Impulse Radio Ultra-Wideband Communication
April 18, 2008 12:00am PDT
Receiver design for Impulse Radio (IR) based Ultra-WideBand (UWB) communication is a challenge, because full-resolution digital receiver is difficult to implement under today's technology due to...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Optimum Combining in Rician Fading: Performance Analysis in Asymptotic SNR Regimes
April 18, 2008 12:00am PDT
This paper analyzes the performance of multiuser Optimum Combining (OC) systems where the desired user undergoes Rician fading, and the received signals are corrupted by Rayleigh-faded...
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
An Improved Decorrelator MUD for Asynchronous MC-CDMA With Extended Observation Window
April 18, 2008 12:00am PDT
In this paper, the authors present and analyze an improved de-correlator MUD for asynchronous Multi-Carrier Code Division Multiple Access (MC-CDMA) systems with extended observation window....
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Spreading Codes Enabling Warp Converging Wiener Filters for Multiuser Detection in CDMA Systems
April 18, 2008 12:00am PDT
It has been shown in the authors' previous work that for signal modes with a specially structured data covariance matrix, a warp (stable and predictable early) convergence can be achieved using...
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
Particle Filtering for Mobility Enhanced Adaptive Sectoring for CDMA Uplink Capacity Maximization
April 18, 2008 12:00am PDT
The uplink capacity of CDMA cellular networks is improved by adaptive sectoring based on tracking of mobiles' spatial distribution. The distribution is modeled as a spatial Poisson process, with...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Performance-Optimized Design of Receiving Filter for Non-Ideally Shaped Modulated Signals
April 18, 2008 12:00am PDT
An improved design of receiving filter for non-ideally shaped modulated signals which provides better performance than existing schemes is proposed. By concerning both Inter-Symbol-Interference...
Provided by: Institute of Electrical & Electronic Engineers
