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Constant Envelope OFDM Phase Modulation: Spectral Containment, Signal Space Properties And Performance
White Papers The signal space is studied by considering the correlation properties of the OFDM-PM signals. A class of constant envelope OFDM phase modulated (OFDM-PM) signals is studied. The motivation behind OFDM-PM is to alleviate the high peak-to-average...
[October 21, 2004, 0:00]
Signal Clarity
White Papers RF signal clarity is one of the key factors in obtaining a high performance wireless data communications link. While it is possible to transmit successfully over short distances with some obstructions in the line of sight, it becomes increasingly...
[March 16, 2004, 23:00]
Using Evolutionary Computation For Seismic Signal Detection: A Homeland Security Application
White Papers Seismic signal detectors can be used in many of these applications. Many organizations and governments have the need to monitor areas for intrusions and, once detected, to identify the type of potential intruder(s) present.
[January 16, 2005, 23:00]
Modified Selected Mapping Technique For PAPR Reduction Of Coded OFDM Signal
White Papers High peak-to-average power ratio (PAPR) of the transmitted signal is a major drawback of orthogonal frequency division multiplexing (OFDM). This paper proposes a modified selective mapping (SLM) technique for PAPR reduction of coded OFDM signal.
[July 21, 2005, 0:00]
Adaptive Prediction Iterative Channel Estimation For OFDM Signal Reception In A Frequency Selective Fading Channel
White Papers For the adaptation of tap weights, the Normalized Least Mean Square (NLMS) algorithm is applied that uses the noisy instantaneous channel gains obtained by reverse modulation and from pilot symbols as the reference signal.
[April 11, 2007, 0:00]
Choosing The Right Architecture For Real-Time Signal Processing Designs
White Papers Real-time signal processing and the applications that utilize it are changing the electronics market. Consumers are inundated with new products and technologies that are smarter, faster, smaller and more interconnected than ever, but which...
[June 10, 2005, 0:00]
Modeling Signal Attenuation In IEEE 802.11 Wireless LANs - Vol. 1
White Papers Path loss models are used to approximate signal attenuation as a function of the distance between transmitters and receivers, being an important building block for both research and industry efforts. This paper presents experimental data that...
[February 7, 2006, 23:00]
Reduced Resolution Method: A Visual Signal Coding Technology For Mobile Communications
White Papers This paper describes a visual signal encoding algorithm that Fujitsu has developed for the MPEG-4 system and describes its effectiveness under error free and error prone conditions. The videophone service has been a dream for a long time, but there...
[April 11, 2005, 0:00]
Alleviating Effects Of Mobility On TCP Performance In Ad Hoc Networks Using Signal Strength Based Link Management
White Papers This paper proposes mechanisms that are based on signal strength measurements to alleviate such packet losses due to mobility at light loads. Mobility in ad hoc networks causes link failures, which in turn result in packet losses.
[January 14, 2008, 23:00]
China National Railway Signal & Communication Co.: Moving To Mobile Technology Improves Work Processes And Productivity
White Papers China National Railway Signal & Communication Co. Research and Design Institution is the largest planning and design center in China's railway communications signal industry. The Institute is working on providing wireless LAN access throughout the...
[March 23, 2005, 23:00]
The Effectiveness Of Signal Clipping For PAPR And Total Degradation Reduction In OFDM Systems
White Papers Signal clipping has been suggested as an effective Peak-to-Average Power Ratio (PAPR) reduction scheme for orthogonal frequency-division multiplexing (OFDM). This paper analyzes clipped M-ary differentially encoded phase-shift keying (M-DPSK) OFDM.
[April 11, 2007, 0:00]
Improving TCP Performance In Ad Hoc Networks Using Signal Strength Based Link Management
White Papers Mechanisms are proposed that are based on signal strength measurements to alleviate such packet losses due to mobility. The key ideas are, if the signal strength measurements indicate that a link failure is most likely due to a neighbor moving out...
[January 14, 2008, 23:00]
Multiple-Antennas And Isotropically-Random Unitary Inputs: The Received Signal Density In Closed-Form
White Papers This paper takes an important step towards computing this capacity by obtaining, in closed-form, the probability density of the received signal when transmitting i.r.unitary matrices. An important open problem in multiple antenna communications...
[April 7, 2005, 0:00]
Bandwidth And The Influence Of Digital Signal Processing
White Papers Digital storage oscilloscopes (DSOs) use advanced digital signal processing (DSP) to enhance accuracy and performance. The most universally recognized figure of merit for any oscilloscope is its bandwidth - the frequency at which the magnitude of...
[July 23, 2007, 0:00]
Design And Implementation Of A Bluetooth Signal Strength Based Location Sensing System
White Papers Location evaluation is preformed by sensing Bluetooth signal strength with a reference model based approach. The paper discusses problems which arise when the Bluetooth RSSI (received signal strength indicator) is used as a signal strength...
[September 20, 2005, 0:00]
Researchers Crack Galileo Signal Codes
News The signal transmitted from GIOVE-A (Galileo In-Orbit Validation Element-A) was broken after researchers intercepted the signals using a roof-mounted hemispherical patch antenna and a digital storage receiver.
[July 13, 2006, 16:35]
Digital Signal Processing Solutions In Optical Networking
White Papers This white paper introduces Texas Instruments (TI) Digital Signal Processing (DSP) solutions for optical networking. An overview of the use of DSP in optical networking component control is presented.
[October 29, 2007, 23:00]
LOCADIO: Inferring Motion And Location From Wi-Fi Signal Strengths
White Papers The system, called LOCADIO, uses Wi-Fi signal strengths from existing access points measured on the client to infer both pieces of context. Context is a critical ingredient of ubiquitous computing. While it is possible to use specialized sensors...
[May 25, 2007, 0:00]
The Application Of Signal's Cyclostationarity In OFDM Systems
White Papers Blind signal processing is one of necessary methods for high data rate communication because no aided data are required, which will bring redundancy. Many communication signals can be regarded as cyclostationary signal.
[April 11, 2007, 0:00]
A Reconfigurable FPGA-Based Readback Signal Generator For Hard-Drive Read Channel Simulator
White Papers A hard disk readback signal generator designed to provide noise-corrupted signals to a channel simulator has been implemented on a Xilinx Virtex E FPGA device. Reconfigurable implementation enables an update of the signal characteristics in runtime.
[August 25, 2007, 0:00]
