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modems
(57 results)-
White Papers
Design and Simulation of Orthogonal Frequency Division Multiplexing (OFDM) Signaling
May 2001
A MATLAB program has been written to investigate Orthogonal Frequency Division Multiplexing (OFDM) communication systems. This program is valuable for future researchers simulating systems that...
Provided by Bradley University
-
White Papers
Broadband MIMO-OFDM Wireless Communications
Feb 2004
Orthogonal frequency division multiplexing (OFDM) is a popular method for high data rate wireless transmission. OFDM may be combined with antenna arrays at the transmitter and receiver to increase...
Provided by Georgia Institute of Technology
-
White Papers
The Principles of OFDM
Jan 2001
The principles of orthogonal frequency division multiplexing (OFDM) modulation have been in existence for several decades. However, in recent years these techniques have quickly moved out of...
Provided by Penton Media
-
White Papers
Enhance Customer Loyalty through Higher Responsiveness
Apr 2009
The economic downturn is forcing businesses to tighten their belts and look for more efficient channels. Using the Internet as a business channel, and sometimes even the only channel, is becoming...
Provided by Oracle
-
White Papers
Video: Circumstances and Customers Have Changed. Has Your Loyalty Program Kept Pace?
Dec 2009
The economic downturn is forcing businesses to tighten their belts and look for more efficient channels. Using the Internet as a business channel, and sometimes even the only channel, is becoming...
Provided by Oracle
-
White Papers
Orthogonal Frequency Division Multiplexing (OFDM)
May 2001
OFDM is a promising candidate for achieving high data rate transmission in mobile environment. The application of OFDM to high data rate mobile communication system is being investigated by many...
Provided by Helsinki University of Technology
-
White Papers
Recommended Practice for Securing Control System Modems
Jan 2008
The overall security of a control system is only as good as its weakest link. Modems represent an often overlooked "Backdoor" to control systems. We know that modems are configured for dial up,...
Provided by US-CERT
-
White Papers
Evolution Modem TCP/IP Functionality
Jan 2009
The TCP/IP capabilities of the Paradise Datacom Evolution series of satellite modems include the capability of auto sensing the cable type. It has been found that auto-sensing is not implemented...
Provided by Paradise Datacom
-
Case Studies
Hewlett-Packard Development Company: Networking Case Study
Jan 2010
Greenbriar Resources is a consultancy firm situated in Underhill, VT that offers business consultation to its constantly growing clientele. Greenbriar Resources was facing a lot of difficulty due...
Provided by Hewlett-Packard (HP)
-
Case Studies
Cable Broadband Operator Sees High Growth After Installing New Device Provisioning System
Jan 2009
A progressive Asia-based communications company wanted to increase subscribership and revenues with premium-quality voice and data service bundles at competitive prices. The company needed to make...
Provided by Incognito Software
-
Case Studies
HP Case Study: C&C Films
Jan 2010
C&C Films is a global film studio offering a complete range of film and video production services ranging from generating storyboards to post-production work and marketing. Because of this digital...
Provided by Hewlett-Packard (HP)
-
Case Studies
HP Case Study: Greenbriar Resources
Jan 2010
Greenbriar Resources is a small consulting firm, based in Underhill, VT, which provides business planning, and sales & marketing services for small and mid-size companies. The company sought an...
Provided by Hewlett-Packard (HP)
-
White Papers
Evolution Modem TCP/IP Functionality White Paper
Jan 2009
This paper describes the TCP/IP capabilities of the Paradise Datacom Evolution series of satellite modems. This report the Evolution modem TCP/IP features and performance, including network...
Provided by Paradise Datacom
-
White Papers
What You Don't Know About Industrial GSM/GPRS Modem Communications
Apr 2009
Cellular communications are becoming increasingly popular in industrial process applications where traditional wired and wireless communications are not possible. The cellular network provides...
Provided by PHOENIX CONTACT
-
White Papers
What Is the Difference Between a Cellular Modem and a Cellular IP Modem?
Aug 2008
Cellular modems and cellular IP modems are vital components in industrial cellular Machine-to-Machine (M2M) networking. However, it may be difficult to differentiate between these two devices...
Provided by Moxa
-
White Papers
The Modem Design Singularity
Dec 2009
At the heart of a mobile phone is an Application Specific Integrated Circuit (ASIC) to do all the necessary complex signal processing, communications protocols, and applications. Mobile devices...
Provided by Cognovo
-
White Papers
A Programmable Impedance Matching Circuit for Voiceband Modems
Aug 2007
A line impedance-matching circuit for a voiceband modem is described. The circuit can be programmed to realize four different impedances. A switched-capacitor filter is used to generate the...
Provided by University of California
-
White Papers
DSP Implementation of SISO and MIMO OFDM Acoustic Modems
Mar 2010
Significant progress has been made recently on the use of multicarrier modulation in the form of Orthogonal Frequency Division Multiplexing (OFDM) for high data rate underwater acoustic...
Provided by University of Connecticut
-
White Papers
A Low Power Preamble Detection Methodology for Packet Based Modems
Jan 2010
In order to achieve frame synchronization in packetbased communication systems, a known sequence (Preamble) is sent at the beginning of each packet. This paper presents a low power scheme for...
Provided by University of Oklahoma
-
White Papers
RTK Networks: Cellular Modem Communication Technology
May 2010
With advancements in GPS positioning technology, obtaining RTK quality corrections is becoming easier and more affordable. A personal base station, consisting of an antenna, receiver, radio...
Provided by Alabama Cooperative Extension System
-
White Papers
Adapting the USRP as an Underwater Acoustic Modem
May 2009
This paper describes how the Universal Software Radio Peripheral (USRP) coupled with GNU Radio can be adapted for use as a configurable UnderWater Acoustic (UWA) modem. The USRP contains an Altera...
Provided by Northeastern University
-
White Papers
Acoustic Communication Performance of the WHOI Micro-Modem in Sea Trials of the Nereus Vehicle to 11,000 m Depth
Aug 2009
The new, unmanned, deep-diving Nereus hybrid vehicle can be configured as a tethered Remotely Operated Vehicle (ROV) using a fiber-optic cable and it can operate un-tethered as an Autonomous...
Provided by Woods Hole Oceanographic Institution
-
White Papers
Design of a Low-Cost, Underwater Acoustic Modem for Short-Range Sensor Networks
Apr 2010
A fundamental impediment to the use of dense underwater sensor networks is an inexpensive acoustic modem. Commercial underwater modems that do exist were designed for sparse, long range,...
Provided by University of California, San Diego
-
White Papers
Cable Modem Vs. Traditional (Telephone) Modem
Jan 2010
In the 1960s, modems (Modulator-Demodulators) were developed to permit the transmission of digital signals over telephone lines. The modulator of a modem converts bits into sounds in the frequency...
Provided by University of Rhode Island
-
White Papers
Wireless Baseband Evolution - Multiple Design Approaches for 4G Modems
Sep 2009
The evolution of 4G wireless baseband indicates there are two evolving technologies that are currently competing for the leading position; namely LTE and WiMAX. WiMAX has emerged as the technology...
Provided by CEVA
-
White Papers
Secure Multicarrier Filter Bank Based Modem on FPGA
Feb 2008
The paper deals with the design and realization of a secure Filter Bank Based (FBB) multicarrier modem on FPGA. The theory and realization of a multicarrier filter bank based modem are presented...
Provided by Technical University of Sofia
-
White Papers
Vehicle Tracking and Disabling Using WIMAX
Jan 2011
The authors see in the present day scenario that the Global Positioning System (GPS) has been an effective tool to track the vehicle. However the adverse part of it is that it can only track a...
Provided by World Academy of Science, Engineering and Technology
-
White Papers
DSP Based Implementation of Scrambler for 56Kbps Modem
Jun 2010
Scrambler is generally employed in data communication systems to add redundancy in the transmitted data stream so that at the receiver end, timing information can be retrieved to aid the...
Provided by University of the West Indies
-
White Papers
Implementation of Adaptive Filter Algorithm for Underwater Acoustic System
Nov 2009
This paper describes development of adaptive filter algorithm for an UnderWater Acoustic Telemetry (UWAT) system for communication between the off - shore Underwater Device (UD) and on-shore...
Provided by Academy Publisher
-
White Papers
Design Modem Based on DSP Processor TMS for Power Line Carrier System
Jan 2010
One of the most important parts of the data transmission systems is processing of the signals. In the primary models of this system, all these processes were done in an analog format. Because of...
Provided by Islamic Azad University
-
White Papers
Secure Multicarrier Modem on FPGA
Jul 2007
The paper deals with the design and realization of a secure multicarrier modem on FPGA. The crypto-modem principle is adopted. An encryption block is integrated in the modem transmitter and a...
Provided by Technical University of Sofia
-
White Papers
Cable Modem Buffer Management in DOCSIS Networks
Feb 2010
A critical component of subscriber management in a DOCSIS-based cable access network is the buffer management strategy that is in operation at the upstream service flow queue located in the cable...
Provided by Clemson University
-
White Papers
Design of a Low-Cost Underwater Acoustic Modem
Sep 2010
There has been an increasing interest in creating short-range, low data rate, underwater wireless sensor networks for scientific marine exploration and monitoring. However, the lack of an...
Provided by Institute of Electrical and Electronics Engineers
-
Whitepapers
Data Transmission at 12kb/s Over 32kb/s ADPCM
May 2012
This paper presents new modified QAM modem that operates at data rate of 12kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code Modulation (ADPCM). The purpose of this modified QAM...
Provided by International Journal of Information and Electronics Engineering
-
Webcasts
Cable Modem Termination Systems (CMTS): Architecture, Configuration, and Troubleshooting
Sep 2012
In this webcast, the presenter going to provides an overview about the Cisco Cable Modem Termination System (CMTS) platforms and the uBR product family. The presenter also explains about the Cable...
Provided by Cisco Systems
-
Whitepapers
A Simple DBPSK Modem Based on High-Speed Logical Gates for a 70/80 GHz GbE Microwave Link
Mar 2010
A simple DBPSK modulator and demodulator based on high-speed logical gates is implemented. The modulator and demodulator is verified in a GbE microwave link for the 70/80 GHz band. Performance is...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
IQ-Mismatch Aware Baseband Receiver Design for Multiband OFDM Based UWB Modems
Dec 2010
In this paper, the authors describe the design of an MBOFDM based UWB receiver that can operate without any IQ imbalance calibration of the receiver front end. Specifically they derive schemes for...
Provided by Indian Institute of Technology Kharagpur
-
Whitepapers
Using the Hilbert Transform in Modem Designing Based on DSP Processor for PLC
Nov 2009
One of the most important parts of the data transmission systems is processing of the signals. In the primary models of this system, all these processes were done in an analog format. Because of...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Data Transmission at 16.8kb/s Over 32kb/s ADPCM Channel
Jun 2012
In this paper, the authors present three models of Quadrature Amplitude Modulation (QAM) modem operating at data rate of 16.8kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code...
Provided by IOSR Journal of Engineering
-
Whitepapers
QCIF Images Performance Analysis Over Adaptative Modem
Mar 2008
In this paper, the authors proposes, modulation study with multi-levels QoS analysis, which can be used to perform physical layer functions for new generation systems. The 3G wireless systems, the...
Provided by NORTH ATLANTIC UNIVERSITY UNION
-
Whitepapers
QCIF Images Performance Analysis Over Adaptative Modem
Mar 2008
In this paper, the authors proposes, modulation study with multi-levels QoS analysis, which can be used to perform physical layer functions for new generation systems. The 3G wireless systems, the...
Provided by NORTH ATLANTIC UNIVERSITY UNION
-
Whitepapers
Data Transmission at 16.8kb/s Over 32kb/s ADPCM Channel
Jun 2012
In this paper, the authors present three models of Quadrature Amplitude Modulation (QAM) modem operating at data rate of 16.8kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code...
Provided by IOSR Journal of Engineering
-
Whitepapers
Using the Hilbert Transform in Modem Designing Based on DSP Processor for PLC
Nov 2009
One of the most important parts of the data transmission systems is processing of the signals. In the primary models of this system, all these processes were done in an analog format. Because of...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
IQ-Mismatch Aware Baseband Receiver Design for Multiband OFDM Based UWB Modems
Dec 2010
In this paper, the authors describe the design of an MBOFDM based UWB receiver that can operate without any IQ imbalance calibration of the receiver front end. Specifically they derive schemes for...
Provided by Indian Institute of Technology Kharagpur
-
Whitepapers
A Simple DBPSK Modem Based on High-Speed Logical Gates for a 70/80 GHz GbE Microwave Link
Mar 2010
A simple DBPSK modulator and demodulator based on high-speed logical gates is implemented. The modulator and demodulator is verified in a GbE microwave link for the 70/80 GHz band. Performance is...
Provided by Institute of Electrical & Electronic Engineers
-
Webcasts
Cable Modem Termination Systems (CMTS): Architecture, Configuration, and Troubleshooting
Sep 2012
In this webcast, the presenter going to provides an overview about the Cisco Cable Modem Termination System (CMTS) platforms and the uBR product family. The presenter also explains about the Cable...
Provided by Cisco Systems
-
Whitepapers
Data Transmission at 12kb/s Over 32kb/s ADPCM
May 2012
This paper presents new modified QAM modem that operates at data rate of 12kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code Modulation (ADPCM). The purpose of this modified QAM...
Provided by International Journal of Information and Electronics Engineering
-
Whitepapers
A Robust Frequency Tracking Loop at the ENodeB for LTE Uplink
Jul 2008
4G systems like LTE (Long Term Evolution) provide an uplink data rate up to 80 Mbps, utilize higher order modulation (64-QAM) and introduce Space Division Multiple Access (SDMA) to improve...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
u-MoDEM : ubiquitous Mobile Device Environment Manager Based on OMA-DM
Feb 2008
Now-a-days, computing technology's improvement changes user's life style. A Ubiquitous Sensor Network technology senses the context information and helps user's activities. An Information...
Provided by Sungkyunkwan University
-
Whitepapers
On Reduced-Complexity Soft-Output Detection of Continuous Phase Modulations
Apr 2008
The authors compare low-complexity schemes for soft-output detection of Continuous Phase Modulations (CPMs). In particular, they address the problem of minimizing the complexity of the front end...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
An Ultrasonic Sensor Based Low-Power Acoustic Modem for Underwater Communication in Underwater Wireless Sensor Networks
Nov 2007
Applications of underwater sensor networks involve environmental monitoring, disaster prevention, and resource detection. As the importance of these applications has recently grown, underwater...
Provided by International Federation for Information Processing
-
White Papers
Proposal for Ground Shipping High Volume of Data Parameter in Supersampling Unmanned Aircraft Through Radio Modem
Oct 2011
In an unmanned aircraft, large volumes of data are generated by the various sensors installed on the aircraft. At critical moments such as take-off, landing, parachute openings, or when the...
Provided by IARIA
-
White Papers
Function Modulation - The Theory for Green Modem
Jun 2010
Bandwidth of a digital communication channel is a valuable natural resource. Therefore it is important that the usage of this resource is minimized by carefully designing the digital modems. In...
Provided by IARIA
-
White Papers
Rate-Range for an FH-FSK Acoustic Modem
Sep 2007
Signals transmitted through underwater channels experience attenuation due to dissipation of acoustic energy by spreading as well as by absorption. The path loss due to absorption is found to be...
Provided by Association for Computing Machinery
-
Case Studies
ERCO&GENER: Turnkey M2M Data Collection With Universal Socket Connectivity Equals Off-the Shelf Solutions
Jan 2008
ERCO & GENER has been providing the M2M market with turnkey and off-the-shelf solutions. Their challenge is that applications such as remote surveillance and remote maintenance requiring...
Provided by Multi-Tech Systems
-
Case Studies
Embedded Device Networking for Industrial Environments
Aug 2007
N-TRON Corp. develops, manufactures, and markets highly reliable industrial network products. Ruggedized versions of computing equipment are commonplace in factories today. A large portion of this...
Provided by Multi-Tech Systems
-
Case Studies
Microte: Quick-to-Market Solution From a Source They Could Trust
Aug 2007
Microtel manufactures telephone and cellular voice dialers, and has served the industry since 1983. Microtel GSM is notorious for introducing "Bumblebee" noise into the audio path. In addition to...
Provided by Multi-Tech Systems
-
White Papers
Towards Gigabit DSL (GDSL): Design of a CC/MC-CDMA Modem
Sep 2007
With the introduction of VDSL2 and the implementation of Fibre-To-The-Curb (FTTC), the theoretical limit of DSL technology is pushed even further than currently known ADSL technology. Current...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A DSP Implementation of OFDM Acoustic Modem
Sep 2007
The success of multicarrier modulation in the form of OFDM in radio channels illuminates a path one could take towards high-rate underwater acoustic communications, and recently there are...
Provided by Association for Computing Machinery
-
White Papers
Localization and Tracking of Underwater Physical Systems
Jun 2011
In this paper, the authors investigate the problem of localizing an underwater sensor node based on message broadcasting from multiple surface nodes. With the time-of-arrival measurements from a...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
NAMS: A Networked Acoustic Modem System for Underwater Applications
Sep 2011
In this paper, the authors present a Networked Acoustic Modem System (NAMS) by integrating a high-speed OFDM modem and a comprehensive underwater network protocol stack for underwater...
Provided by University of Connecticut
-
White Papers
A Low-Cost 60 GHz OFDM Modem
May 2009
A simple soft-demapping scheme for Rectangular Quadrature Amplitude Modulation (R-QAM) signals is developed for a low-cost 60 GHz OFDM baseband chip design, conforming to the IEEE802.15.3C...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Design of a Low-Cost Underwater Acoustic Modem
Sep 2010
There has been an increasing interest in creating short-range, low data rate, underwater wireless sensor networks for scientific marine exploration and monitoring. However, the lack of an...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Cable Modem Buffer Management in DOCSIS Networks
Feb 2010
A critical component of subscriber management in a DOCSIS-based cable access network is the buffer management strategy that is in operation at the upstream service flow queue located in the cable...
Provided by Clemson University
-
White Papers
Secure Multicarrier Modem on FPGA
Jul 2007
The paper deals with the design and realization of a secure multicarrier modem on FPGA. The crypto-modem principle is adopted. An encryption block is integrated in the modem transmitter and a...
Provided by Technical University of Sofia
-
White Papers
Design Modem Based on DSP Processor TMS for Power Line Carrier System
Jan 2010
One of the most important parts of the data transmission systems is processing of the signals. In the primary models of this system, all these processes were done in an analog format. Because of...
Provided by Islamic Azad University
-
White Papers
Implementation of Adaptive Filter Algorithm for Underwater Acoustic System
Nov 2009
This paper describes development of adaptive filter algorithm for an UnderWater Acoustic Telemetry (UWAT) system for communication between the off - shore Underwater Device (UD) and on-shore...
Provided by Academy Publisher
-
White Papers
DSP Based Implementation of Scrambler for 56Kbps Modem
Jun 2010
Scrambler is generally employed in data communication systems to add redundancy in the transmitted data stream so that at the receiver end, timing information can be retrieved to aid the...
Provided by University of the West Indies
-
White Papers
Vehicle Tracking and Disabling Using WIMAX
Jan 2011
The authors see in the present day scenario that the Global Positioning System (GPS) has been an effective tool to track the vehicle. However the adverse part of it is that it can only track a...
Provided by World Academy of Science, Engineering and Technology
-
White Papers
Secure Multicarrier Filter Bank Based Modem on FPGA
Feb 2008
The paper deals with the design and realization of a secure Filter Bank Based (FBB) multicarrier modem on FPGA. The theory and realization of a multicarrier filter bank based modem are presented...
Provided by Technical University of Sofia
-
White Papers
Wireless Baseband Evolution - Multiple Design Approaches for 4G Modems
Sep 2009
The evolution of 4G wireless baseband indicates there are two evolving technologies that are currently competing for the leading position; namely LTE and WiMAX. WiMAX has emerged as the technology...
Provided by CEVA
-
White Papers
Cable Modem Vs. Traditional (Telephone) Modem
Jan 2010
In the 1960s, modems (Modulator-Demodulators) were developed to permit the transmission of digital signals over telephone lines. The modulator of a modem converts bits into sounds in the frequency...
Provided by University of Rhode Island
-
White Papers
Design of a Low-Cost, Underwater Acoustic Modem for Short-Range Sensor Networks
Apr 2010
A fundamental impediment to the use of dense underwater sensor networks is an inexpensive acoustic modem. Commercial underwater modems that do exist were designed for sparse, long range,...
Provided by University of California, San Diego
-
White Papers
Acoustic Communication Performance of the WHOI Micro-Modem in Sea Trials of the Nereus Vehicle to 11,000 m Depth
Aug 2009
The new, unmanned, deep-diving Nereus hybrid vehicle can be configured as a tethered Remotely Operated Vehicle (ROV) using a fiber-optic cable and it can operate un-tethered as an Autonomous...
Provided by Woods Hole Oceanographic Institution
-
White Papers
Adapting the USRP as an Underwater Acoustic Modem
May 2009
This paper describes how the Universal Software Radio Peripheral (USRP) coupled with GNU Radio can be adapted for use as a configurable UnderWater Acoustic (UWA) modem. The USRP contains an Altera...
Provided by Northeastern University
-
White Papers
RTK Networks: Cellular Modem Communication Technology
May 2010
With advancements in GPS positioning technology, obtaining RTK quality corrections is becoming easier and more affordable. A personal base station, consisting of an antenna, receiver, radio...
Provided by Alabama Cooperative Extension System
-
White Papers
A Low Power Preamble Detection Methodology for Packet Based Modems
Jan 2010
In order to achieve frame synchronization in packetbased communication systems, a known sequence (Preamble) is sent at the beginning of each packet. This paper presents a low power scheme for...
Provided by University of Oklahoma
-
White Papers
DSP Implementation of SISO and MIMO OFDM Acoustic Modems
Mar 2010
Significant progress has been made recently on the use of multicarrier modulation in the form of Orthogonal Frequency Division Multiplexing (OFDM) for high data rate underwater acoustic...
Provided by University of Connecticut
-
White Papers
A Programmable Impedance Matching Circuit for Voiceband Modems
Aug 2007
A line impedance-matching circuit for a voiceband modem is described. The circuit can be programmed to realize four different impedances. A switched-capacitor filter is used to generate the...
Provided by University of California
-
White Papers
The Modem Design Singularity
Dec 2009
At the heart of a mobile phone is an Application Specific Integrated Circuit (ASIC) to do all the necessary complex signal processing, communications protocols, and applications. Mobile devices...
Provided by Cognovo
-
White Papers
Broadband MIMO-OFDM Wireless Communications
Feb 2004
Orthogonal frequency division multiplexing (OFDM) is a popular method for high data rate wireless transmission. OFDM may be combined with antenna arrays at the transmitter and receiver to increase...
Provided by Georgia Institute of Technology
-
White Papers
Vehicle Tracking and Disabling Using WIMAX
Jan 2011
The authors see in the present day scenario that the Global Positioning System (GPS) has been an effective tool to track the vehicle. However the adverse part of it is that it can only track a...
Provided by World Academy of Science, Engineering and Technology
-
White Papers
Design and Simulation of Orthogonal Frequency Division Multiplexing (OFDM) Signaling
May 2001
A MATLAB program has been written to investigate Orthogonal Frequency Division Multiplexing (OFDM) communication systems. This program is valuable for future researchers simulating systems that...
Provided by Bradley University
-
White Papers
The Principles of OFDM
Jan 2001
The principles of orthogonal frequency division multiplexing (OFDM) modulation have been in existence for several decades. However, in recent years these techniques have quickly moved out of...
Provided by Penton Media
-
White Papers
Enhance Customer Loyalty through Higher Responsiveness
Apr 2009
The economic downturn is forcing businesses to tighten their belts and look for more efficient channels. Using the Internet as a business channel, and sometimes even the only channel, is becoming...
Provided by Oracle
-
White Papers
Video: Circumstances and Customers Have Changed. Has Your Loyalty Program Kept Pace?
Dec 2009
The economic downturn is forcing businesses to tighten their belts and look for more efficient channels. Using the Internet as a business channel, and sometimes even the only channel, is becoming...
Provided by Oracle
-
White Papers
Orthogonal Frequency Division Multiplexing (OFDM)
May 2001
OFDM is a promising candidate for achieving high data rate transmission in mobile environment. The application of OFDM to high data rate mobile communication system is being investigated by many...
Provided by Helsinki University of Technology
-
White Papers
Recommended Practice for Securing Control System Modems
Jan 2008
The overall security of a control system is only as good as its weakest link. Modems represent an often overlooked "Backdoor" to control systems. We know that modems are configured for dial up,...
Provided by US-CERT
-
White Papers
Evolution Modem TCP/IP Functionality
Jan 2009
The TCP/IP capabilities of the Paradise Datacom Evolution series of satellite modems include the capability of auto sensing the cable type. It has been found that auto-sensing is not implemented...
Provided by Paradise Datacom
-
Case Studies
Hewlett-Packard Development Company: Networking Case Study
Jan 2010
Greenbriar Resources is a consultancy firm situated in Underhill, VT that offers business consultation to its constantly growing clientele. Greenbriar Resources was facing a lot of difficulty due...
Provided by Hewlett-Packard (HP)
-
Case Studies
Cable Broadband Operator Sees High Growth After Installing New Device Provisioning System
Jan 2009
A progressive Asia-based communications company wanted to increase subscribership and revenues with premium-quality voice and data service bundles at competitive prices. The company needed to make...
Provided by Incognito Software
-
Case Studies
HP Case Study: C&C Films
Jan 2010
C&C Films is a global film studio offering a complete range of film and video production services ranging from generating storyboards to post-production work and marketing. Because of this digital...
Provided by Hewlett-Packard (HP)
-
Case Studies
HP Case Study: Greenbriar Resources
Jan 2010
Greenbriar Resources is a small consulting firm, based in Underhill, VT, which provides business planning, and sales & marketing services for small and mid-size companies. The company sought an...
Provided by Hewlett-Packard (HP)
-
White Papers
Evolution Modem TCP/IP Functionality White Paper
Jan 2009
This paper describes the TCP/IP capabilities of the Paradise Datacom Evolution series of satellite modems. This report the Evolution modem TCP/IP features and performance, including network...
Provided by Paradise Datacom
-
White Papers
What You Don't Know About Industrial GSM/GPRS Modem Communications
Apr 2009
Cellular communications are becoming increasingly popular in industrial process applications where traditional wired and wireless communications are not possible. The cellular network provides...
Provided by PHOENIX CONTACT
-
White Papers
What Is the Difference Between a Cellular Modem and a Cellular IP Modem?
Aug 2008
Cellular modems and cellular IP modems are vital components in industrial cellular Machine-to-Machine (M2M) networking. However, it may be difficult to differentiate between these two devices...
Provided by Moxa
-
White Papers
The Modem Design Singularity
Dec 2009
At the heart of a mobile phone is an Application Specific Integrated Circuit (ASIC) to do all the necessary complex signal processing, communications protocols, and applications. Mobile devices...
Provided by Cognovo
-
White Papers
A Programmable Impedance Matching Circuit for Voiceband Modems
Aug 2007
A line impedance-matching circuit for a voiceband modem is described. The circuit can be programmed to realize four different impedances. A switched-capacitor filter is used to generate the...
Provided by University of California
-
White Papers
DSP Implementation of SISO and MIMO OFDM Acoustic Modems
Mar 2010
Significant progress has been made recently on the use of multicarrier modulation in the form of Orthogonal Frequency Division Multiplexing (OFDM) for high data rate underwater acoustic...
Provided by University of Connecticut
-
White Papers
A Low Power Preamble Detection Methodology for Packet Based Modems
Jan 2010
In order to achieve frame synchronization in packetbased communication systems, a known sequence (Preamble) is sent at the beginning of each packet. This paper presents a low power scheme for...
Provided by University of Oklahoma
-
White Papers
RTK Networks: Cellular Modem Communication Technology
May 2010
With advancements in GPS positioning technology, obtaining RTK quality corrections is becoming easier and more affordable. A personal base station, consisting of an antenna, receiver, radio...
Provided by Alabama Cooperative Extension System
-
White Papers
Adapting the USRP as an Underwater Acoustic Modem
May 2009
This paper describes how the Universal Software Radio Peripheral (USRP) coupled with GNU Radio can be adapted for use as a configurable UnderWater Acoustic (UWA) modem. The USRP contains an Altera...
Provided by Northeastern University
-
White Papers
Acoustic Communication Performance of the WHOI Micro-Modem in Sea Trials of the Nereus Vehicle to 11,000 m Depth
Aug 2009
The new, unmanned, deep-diving Nereus hybrid vehicle can be configured as a tethered Remotely Operated Vehicle (ROV) using a fiber-optic cable and it can operate un-tethered as an Autonomous...
Provided by Woods Hole Oceanographic Institution
-
White Papers
Design of a Low-Cost, Underwater Acoustic Modem for Short-Range Sensor Networks
Apr 2010
A fundamental impediment to the use of dense underwater sensor networks is an inexpensive acoustic modem. Commercial underwater modems that do exist were designed for sparse, long range,...
Provided by University of California, San Diego
-
White Papers
Cable Modem Vs. Traditional (Telephone) Modem
Jan 2010
In the 1960s, modems (Modulator-Demodulators) were developed to permit the transmission of digital signals over telephone lines. The modulator of a modem converts bits into sounds in the frequency...
Provided by University of Rhode Island
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White Papers
Wireless Baseband Evolution - Multiple Design Approaches for 4G Modems
Sep 2009
The evolution of 4G wireless baseband indicates there are two evolving technologies that are currently competing for the leading position; namely LTE and WiMAX. WiMAX has emerged as the technology...
Provided by CEVA
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White Papers
Secure Multicarrier Filter Bank Based Modem on FPGA
Feb 2008
The paper deals with the design and realization of a secure Filter Bank Based (FBB) multicarrier modem on FPGA. The theory and realization of a multicarrier filter bank based modem are presented...
Provided by Technical University of Sofia
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White Papers
DSP Based Implementation of Scrambler for 56Kbps Modem
Jun 2010
Scrambler is generally employed in data communication systems to add redundancy in the transmitted data stream so that at the receiver end, timing information can be retrieved to aid the...
Provided by University of the West Indies
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White Papers
Implementation of Adaptive Filter Algorithm for Underwater Acoustic System
Nov 2009
This paper describes development of adaptive filter algorithm for an UnderWater Acoustic Telemetry (UWAT) system for communication between the off - shore Underwater Device (UD) and on-shore...
Provided by Academy Publisher
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White Papers
Design Modem Based on DSP Processor TMS for Power Line Carrier System
Jan 2010
One of the most important parts of the data transmission systems is processing of the signals. In the primary models of this system, all these processes were done in an analog format. Because of...
Provided by Islamic Azad University
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White Papers
Secure Multicarrier Modem on FPGA
Jul 2007
The paper deals with the design and realization of a secure multicarrier modem on FPGA. The crypto-modem principle is adopted. An encryption block is integrated in the modem transmitter and a...
Provided by Technical University of Sofia
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White Papers
Cable Modem Buffer Management in DOCSIS Networks
Feb 2010
A critical component of subscriber management in a DOCSIS-based cable access network is the buffer management strategy that is in operation at the upstream service flow queue located in the cable...
Provided by Clemson University
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White Papers
Design of a Low-Cost Underwater Acoustic Modem
Sep 2010
There has been an increasing interest in creating short-range, low data rate, underwater wireless sensor networks for scientific marine exploration and monitoring. However, the lack of an...
Provided by Institute of Electrical and Electronics Engineers
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Whitepapers
Data Transmission at 12kb/s Over 32kb/s ADPCM
May 2012
This paper presents new modified QAM modem that operates at data rate of 12kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code Modulation (ADPCM). The purpose of this modified QAM...
Provided by International Journal of Information and Electronics Engineering
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Webcasts
Cable Modem Termination Systems (CMTS): Architecture, Configuration, and Troubleshooting
Sep 2012
In this webcast, the presenter going to provides an overview about the Cisco Cable Modem Termination System (CMTS) platforms and the uBR product family. The presenter also explains about the Cable...
Provided by Cisco Systems
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Whitepapers
A Simple DBPSK Modem Based on High-Speed Logical Gates for a 70/80 GHz GbE Microwave Link
Mar 2010
A simple DBPSK modulator and demodulator based on high-speed logical gates is implemented. The modulator and demodulator is verified in a GbE microwave link for the 70/80 GHz band. Performance is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
IQ-Mismatch Aware Baseband Receiver Design for Multiband OFDM Based UWB Modems
Dec 2010
In this paper, the authors describe the design of an MBOFDM based UWB receiver that can operate without any IQ imbalance calibration of the receiver front end. Specifically they derive schemes for...
Provided by Indian Institute of Technology Kharagpur
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Whitepapers
Using the Hilbert Transform in Modem Designing Based on DSP Processor for PLC
Nov 2009
One of the most important parts of the data transmission systems is processing of the signals. In the primary models of this system, all these processes were done in an analog format. Because of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Data Transmission at 16.8kb/s Over 32kb/s ADPCM Channel
Jun 2012
In this paper, the authors present three models of Quadrature Amplitude Modulation (QAM) modem operating at data rate of 16.8kb/s to be transmitted over 32kb/s Adaptive Differential Pulse Code...
Provided by IOSR Journal of Engineering
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Whitepapers
QCIF Images Performance Analysis Over Adaptative Modem
Mar 2008
In this paper, the authors proposes, modulation study with multi-levels QoS analysis, which can be used to perform physical layer functions for new generation systems. The 3G wireless systems, the...
Provided by NORTH ATLANTIC UNIVERSITY UNION
