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tools & techniques
(23254 results)-
Whitepapers
Interference Management and Handoff Techniques in Ultra Mobile Broadband Communication Systems
July 14, 2008 12:00am PDT
Wireless communications of the next generation rely on large bandwidths and Orthogonal Frequency Division Multiple Access (OFDMA) techniques to achieve high data rates. In a OFDMA-based Wireless...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Efficient Transmission Technique for MIMO-OFDM Broadcast Channels With Limited Feedback
July 14, 2008 12:00am PDT
In multiuser downlink, the use of multiple antennas at the base station and user terminals leads to a great increase in the system throughput. However, this increase is only achieved with proper...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Wideband Measurement for Body Effect of BAN Channel
July 14, 2008 12:00am PDT
Application of wireless communication technology to medical care (called Medical-Information and Communication Technology) is attractive topic in recent year. Ultra WideBand (UWB) is examined as...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Cooperative UWB Body Area Networking: Channel Measurement and Diversity Analysis
July 14, 2008 12:00am PDT
The authors explore the application of cooperative communications in Ultra-WideBand (UWB) Wireless Body Area Networks (WBANs). Firstly, time-domain UWB channel measurements are presented for a...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Soft Detection of Modulation Diversity Schemes for Next Generation Digital Terrestrial Television
July 14, 2008 12:00am PDT
The next generation of Digital Video Broadcasting Terrestrial Television (DVB-T2) standard requires to improve performance of the current DVB-T standard. Commercial and technical reasons suggest...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Rotated QAM Constellations to Improve BICM Performance for DVB-T2
July 14, 2008 12:00am PDT
A technique intended to increase the diversity order of Bit-Interleaved Coded Modulations (BICM) over non Gaussian channels is presented. It introduces simple modifications to the mapper and to...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Improving the Initial Code Acquisition in Asynchronous Band-Limited Spread-Spectrum Systems
July 14, 2008 12:00am PDT
This paper investigates on a new code acquisition technique for spread-spectrum communication systems using band-limited chip waveforms. The scheme is aimed at obtaining initial synchronization of...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Staggered Time and Frequency Search to Aid Frame Synchronization
July 14, 2008 12:00am PDT
This paper tackles the problem of frame synchronization in the presence of timing and frequency uncertainty. Considering a discretization of the timing uncertainty domain in time slots, and of the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Overloading Performance of OCDMA/OCDMA Scheme for Cellular DS-CDMA System on Rayleigh Fading Channel
July 14, 2008 12:00am PDT
Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient scheme to increase the number users in a fixed bandwidth. One of the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Analysis of OFDM-IDMA Systems With Peak-Power Limitation
July 14, 2008 12:00am PDT
This paper is concerned with Orthogonal Frequency Division Multiplexing Interleave-Division Multiple-Access (OFDMIDMA) systems over frequency-selective fading channels. Deliberate clipping is...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Gigabits/s Radios @ 60GHz: To OFDM or Not to OFDM?
July 14, 2008 12:00am PDT
The discussion on what is the most appropriate air interface for multiple Gbit/s radios @ 60GHz concentrates around the question: to OFDM or not to OFDM. This paper brings the arguments for two...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Grouped Precoding in MU-MIMO Downlink
July 14, 2008 12:00am PDT
Based on the nature of multi-user Multiple-Input Multiple-Output (MIMO) system, a novel downlink Grouped-Joint Transmission (GJT) precoding algorithm is put forward by using grouping technique. In...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Periodic Hadamard Phase Precoding for HARQ Systems Over Intersymbol Interference Channels
July 14, 2008 12:00am PDT
In this paper, the authors present a simple and effective precoding technique to mitigate inter-symbol interference in communication systems that implement Automatic Repeat reQuest (ARQ) protocols...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Adapted LDPC Error Correction Scheme for 2D Optical CDMA Multimedia System
July 14, 2008 12:00am PDT
To provide multimedia services in optical networks, 2 Dimensional Optical Code Division Multiple Access (2D OCDMA) system is considered as a potential solution. The authors focus here on a 2D...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Cooperative UWB-Based Positioning Systems: CDAP Algorithm and Experimental Results
July 14, 2008 12:00am PDT
The need for accurate positioning has attracted significant interest in recent years, especially in cluttered environments where signals from satellite navigation systems are not reliable....
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
First End to End IPv6 DVB-RCS Systems
July 14, 2008 12:00am PDT
This paper presents the three different platforms developed within the frame of the SATSIX European project and shows live trials description and results. To prepare final experimentations on the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
An Investigation of TCP Congestion Window Validation Over Satellite Paths
July 14, 2008 12:00am PDT
This paper examines an issue that arises when an internet transport-layer connection using TCP is suspended (e.g. to mobile hand-off application dynamics or user preference) and later resumed. In...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Recovering From Packet Losses in CCSDS Links
July 14, 2008 12:00am PDT
Data unit losses in deep space communications are currently faced using retransmission techniques which are however inefficient due to the large round trip delays. For this reason, the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Turbo Equalization of Non-Linear Satellite Channels Using Soft Interference Cancellation
July 14, 2008 12:00am PDT
Satellite communication channels can be well described as non-linear functions with memory. The Volterra series representation provides accurate modeling of satellite channel dynamics, and thus,...
Provided by: Institute of Electrical & Electronic Engineers
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White Papers
Sketch-Based Summarization of Ordered XML Streams
July 14, 2008 12:00am PDT
XML streams, such as RSS feeds or complex event streams, are becoming increasingly pervasive as they provide the foundation for a wide range of emerging applications. An important problem in this...
Provided by: University of California
