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Cross-Layer Optimization of OFDM Transmission Systems for MPEG-4 Video Streaming
White Papers This paper studies the performance of a combined link- and physical-layer approach for the downlink of a dynamic OFDM-FDMA transmission system delivering MPEG-4 video streams. The approach consists of three different mechanisms - queue management...
[April 11, 2007, 1:01]
Optimum Multi-Coded OFDM Transmission
White Papers This paper is devoted to multi-coded OFDM transmission over fading channels. The BER and throughput results obtained by simulation of the OFDM transmission in frequency selective channels and in the AWGN channel are presented.
[April 11, 2007, 1:01]
Feasibility of Adaptive Transmission for Multicarrier and Frequency Hopping Mobile Radio Systems
White Papers This paper addresses feasibility of adaptive transmission for rapidly varying fading channels encountered in mobile communication systems. Due to rapid channel variations and the feedback delay, implementation of adaptive transmission in these...
[August 10, 2007, 10:45]
On Througput of Multipath Data Transmission Over Multihop Ad Hoc Networks
White Papers Data transmission in ad hoc networks involves interactions between MAC-layer protocol and data forwarding along network-layer paths. In this paper, their impact on the multipath data transmission system over multihop IEEE 802.11 MAC-based ad hoc...
[August 10, 2007, 10:44]
Multipath Routing Based Secure Data Transmission in Ad Hoc Networks
White Papers The specific characteristics of Mobile Ad Hoc NETworks (MANETs) make cooperation among all nodes and secure transmission important issues in its research. Misbehaving nodes with different intentions and capabilities would conduct various types of...
[August 10, 2007, 10:36]
HP Integrated Network Management System Makes Data Transmission Automatic - And Operators Happy
White Papers RAI Way also has more than 60 other access points to its transmission network for connecting broadcasting units outside the country. The company wanted to put an end to configuration nightmares by implementing a solution that automates the building...
[July 5, 2006, 0:00]
Limitations of Transmission Distances Over Multimode Fiber
White Papers This paper details the limitations in transmission distances suffered by laser-based Gigabit networks operating near a wavelength of 1300nm over multimode fibers. Multimode fiber simply refers to the fact that numerous modes or light rays are...
[June 12, 2008, 1:01]
TFMC: A TCP-Friendly Multiplexing Control Scheme for VoIP Flow Transmission
White Papers These negative effects range from the inefficient use of bandwidth to the network congestion caused by the large number of short voice packets flowing into the IP network, which degrades the real-time transmission performance and creates a...
[December 27, 2007, 0:01]
Wireless Data Transmission over GSM Short Message Service (GSM-SMS)
White Papers This is a white paper on the efforts of EACOMM Corporation Embedded Systems Division, in Developing Wireless Data Transmission Systems utilizing existing Wireless Telecommunications Infrastructure.
[September 25, 2003, 1:26]
Online Smooth Transmission With Rate Prediction for Layered Video Streaming
White Papers A new, online smooth transmission scheme for layered video streaming through heterogeneous networks is proposed with more efficient bandwidth utilization and smaller delay than existed methods. To transmit online video smoothly and prevent server...
[October 22, 2008, 1:01]
A Service-Oriented Architecture for Electric Power Transmission System Asset Management
White Papers In electric power transmission systems, the assets include transmission lines, transformers, power plants and support structures. Maintaining these assets to reliably deliver electric energy at low prices is critical for a nation's growth and...
[March 22, 2007, 0:00]
Technical Challenges of 40 Gbit/s in WDM Submarine Transmission
White Papers Answering these challenges, Alcatel Research and Innovation reports the first successful laboratory transmission of 40 channels at 40 Gbits/s over 9,180 km with industrial margins. There is a growing consensus that 40 Gbits/s channels will be...
[October 11, 2005, 3:00]
Multi-Coded OFDM Transmission Using Pace-Time Block Codes
White Papers This paper addresses link adaptation for multi-coded OFDM transmission with space-time processing. The previously proposed algorithm of Code and Modulation (CM) selection and power loading, on a basis of temporary channel information, is evaluated...
[April 11, 2007, 1:01]
A Method to Support High Data Transmission Rate in Ad-Hoc Networks Based on Bluetooth
White Papers This paper proposes the new Ad-Hoc network topology called "DoublePico" (Double Piconet) for overcoming low data transmission rate in a scatternet which is constructed by bluetooth's piconets. This paper presents the method of DoublePico which...
[May 18, 2009, 8:38]
Real-Time Digital Carrier & Data Recovery for a Synchronous Optical Quadrature Phase Shift Keying Transmission System
White Papers In particular the design of DSP components is presented which are required to realize a 10 Gbaud synchronous optical Quadrature Phase Shift Keying (QPSK) transmission system. Additionally the measurement results of a preliminary synchronous QPSK...
[October 7, 2008, 1:01]
Throughput and Transmission Capacity of Ad Hoc Networks With Channel State Information
White Papers This paper develops a general framework for deriving the spatial throughput and transmission capacity of spatially Poisson distributed ad hoc networks for random (e.g.fading) channels, and random transmission distances.
[August 10, 2007, 10:50]
GSM Vocoders Improve Speech Transmission
White Papers With the current focus on high-speed packet data transmission, it is easy to forget that the primary purpose of GSM digital telecom systems was for speech transmission. The key principle behind the coders used in the GSM system is the mathematical...
[November 10, 2005, 0:00]
The Power Line Transmission Characteristics for an OFDM Signal
White Papers This paper measures what influence the sinusoidal transmission characteristics of the electric power line with various forms gave to the transmission characteristic of OFDM (Orthogonal Frequency Division Multiplexing) signal through PLC (Power...
[April 11, 2007, 1:01]
Next-Generation Optical Transmission Fibers
White Papers The first part of this paper gives a brief introduction of modern optical transmission fiber technology. The new Medium Dispersion Fiber (MDF) has dispersion of around 7~8 ps/nm/km at 1550nm, and a relatively low dispersion slope in the S-C-L band...
[March 16, 2009, 4:09]
A Novel Coding Technique to Minimise the Transmission Bandwidth and Bit Error Rate in DPSK
White Papers This paper proposes a novel coding technique that aims to reduce the Transmission Bandwidth (BT) and Bit Error Rate (BER) vis-a-vis Conventional Differential Phase Shift Keying (CDPSK) in digital band pass transmission.
[July 8, 2008, 1:01]
