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tools & techniques
(23148 results)-
Whitepapers
Efficiency of Transmission Techniques in Multiple-Input Single-Output (MISO) Communication System
August 20, 2007 12:00am PDT
This paper examines methods of increasing the downlink channel capacity based on transmitting a signal through a multiple antenna system such as BeamForming (BF), Transmit Diversity (TD) and the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
System Layer Evaluation of Joint Detection and Imperfect Adaptive Beam-Forming Antenna for Packet Services in the LCR TD-CDMA System
August 20, 2007 12:00am PDT
Both Adaptive Beam-forming Antenna (ABA) and Joint Detection (JD) are key techniques in the LCR (Low Code Rate) TD-CDMA system. ABA is adopted to suppress multi-path fading with antenna diversity...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
On Cellular MIMO Spectrum Efficiency
August 20, 2007 12:00am PDT
To increase the transmission rate without bandwidth expansion, Multiple-Input Multiple-Output (MIMO) technique has been attracting much attention. When MIMO technique is applied to a cellular...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Cholesky Based Detector for MIMO Flat Fading Channels
August 20, 2007 12:00am PDT
This paper presents a new ordering criterion for Successive Interference Cancelations (SIC) in MIMO flat fading channels and provides a performance comparison with the original ordering of...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
An Improved LLR Computation for QRM-MLD in Coded MIMO Systems
August 20, 2007 12:00am PDT
Near Maximum-Likelihood (ML) detections with reduced complexity are promising techniques for coded Multiple-Input Multiple-Output (MIMO) systems. Particularly, the QRMMLD algorithm is often...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Proposal of RM QRM-MLD with Independent Adaptive Control of Surviving Symbol Replica Candidates for MIMO-OFDM System
August 20, 2007 12:00am PDT
In this paper, the authors propose the algorithm that combine RM QRM-MLD algorithm they proposed and independent adaptive control of surviving symbol replica candidates (they call this technique...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Downlink Steered Space-Time Spreading Assisted Generalised Multicarrier DS-CDMA Using Sphere-Packing-Aided Multilevel Coding
August 20, 2007 12:00am PDT
This paper presents a novel generalised Multi-Carrier Direct Sequence Code Division Multiple Access (MC DS-CDMA) system invoking smart antennas for improving the achievable performance in the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Joint TOA/AOA Constrained Minimization Method for Locating Wireless Devices in Non-Line-of-Sight Environment
August 20, 2007 12:00am PDT
Non-Line-Of-Sight (NLOS) propagation degrades the performance of wireless location systems. Thus, developing algorithms that are robust to NLOS is of great importance. This paper introduces a new...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Channel Estimation with Space-Time Windowing in MIMO PE-SDM Transmission
August 20, 2007 12:00am PDT
In a frequency-selective MIMO channel, the optimum beamforming is achieved by using eigenvectors, i.e., Eigen-beam-Space Division Multiplexing (E-SDM), in the frequency domain. However, the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Impact of Array Configuration on Channel-And Noise-Covariance in Multiple Antenna Systems
August 20, 2007 12:00am PDT
In this paper an analytical description for the transmission between multiple antennas is developed. The method allows the determination of co-variances and channel capacity with respect to...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
MBER Turbo Multiuser Beamforming Aided QPSK Receiver Design Using EXIT Chart Analysis
August 20, 2007 12:00am PDT
This paper studies the mutual information transfer characteristics of a novel iterative Soft Interference Cancellation (SIC) aided beamforming receiver designed for Quadrature Phase Shift Keying...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Low Complexity IFFT-Based PTS Technique for PAPR Reduction in OFDM Systems
August 20, 2007 12:00am PDT
A low complexity Partial Transmit Sequence (PTS) technique for reducing the Peak-to-Average Power Ratio (PAPR) of an Orthogonal Frequency Division Multiplexing (OFDM) signal is presented. Signals...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Differential Super-Quasi-Orthogonal Space-Time Trellis Codes
August 20, 2007 12:00am PDT
In the past few years, many space-time modulation techniques for transmit diversity over the wireless channels have been studied. However, most of the space-time schemes require the knowledge of...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of MIMO-OFDM Systems with Adaptive Beamforming Algorithm
August 20, 2007 12:00am PDT
In this paper, the new technique combining space-time decoder with beamforming is proposed for an Orthogonal Frequency Division Multiplexing (OFDM) system with Multi-Input Multi-Output (MIMO)....
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Low-Complexity Coordinated Interference-Aware Beamforming for MIMO Broadcast Channels
August 20, 2007 12:00am PDT
A novel Coordinated Interference-aware Beamforming (CIB) technique for Multiple-Input-Multiple-Output (MIMO) Broadcast Channels (BC) is introduced. The CIB technique uses a method based on...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Spatial Multiplexing MIMO Scheme with Beamforming for Downlink Transmission
August 20, 2007 12:00am PDT
This paper investigates a spatial multiplexing MIMO scheme with beamforming for downlink transmission. The proposed scheme combines spatial multiplexing MIMO technique with beamforming, which has...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Single-Carrier Space-Frequency Block Coding
August 20, 2007 12:00am PDT
In this paper, the authors investigate the performance of Single-Carrier Space-Frequency Block Coding (SC-SFBC), a new diversity technique compatible with Single-Carrier Frequency Division...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Frequency-Domain Equalization Architecture for Space-Time Block Coded MIMO-CDMA Systems
August 20, 2007 12:00am PDT
For future broadband mobile communications, high data rate and spectrum-efficient transmission techniques are required to provide high-quality wireless services with limited frequency bandwidth....
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Simple Orthogonal Space-Time-Polarization Block Code
August 20, 2007 12:00am PDT
This paper proposes a simple but highly efficient technique to jointly utilize space, time, and polarization diversities. The technique is based on extending orthogonal space-time block codes into...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
An Orthogonal Full Rate Full Diversity Space Time Block Code for Four Transmit Antenna Systems
August 20, 2007 12:00am PDT
The authors present a new Space-Time Block Code (STBC) that is orthogonal, full rate and achieves full diversity for four transmit antennas when a special "Triple-QPSK" modulation is used. The...
Provided by: Institute of Electrical & Electronic Engineers
