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- Enhancing IEEE 802.11a/n With Dynamic Single-User OFDM Adaptation
- Earlier paper have demonstrated that the achievable throughput of OFDM systems can benefit significantly from individual modulation/transmit power selection on a per sub-carrier basis according to the actual gain of individual sub-carriers so called dynamic OFDM scheme. Usage of such approach requires, however, providing support for additional functionalities like: acquisition...
- Tags: IEEE, OFDM, Wireless And Mobility
- White papers 2008-05-21
- Electronics and Circuit Analysis Quick Study Guide. FREE first chapter in the trial (Mobile)
- Boost Your grades with this illustrated quick-study guide. You will use it from an undergraduate school all the way to graduate school and beyond. FREE first chapter in the trial version.Features Clear and concise explanations Difficult concepts are explained in simple terms Illustrated with graphs and diagrams Search for the...
- Tags: Diode, Mobile, Electronics, Amplifier, Modulation, Analysis, Semiconductors, Hardware
- Software downloads 2007-07-24
- Google dangles $4.6 billion in front of the FCC
- Google dangles $4.6 billion in front of the FCCYou nailed itClearly this is all 100% beneficial for consumers. Fortunately for everyone except the carriers this is ctually one of the rare cases where Google's interests align with the those of the consumer. This being the case Google's hamhanded approach to...
- Tags: Federal government, Telecom & Utilities, Strategy, FCC, search engine, Google Inc.
- Discussion threads 2007-07-20
- Radio-Over-Fiber Transmission of 1.25-Gigabit Ethernet Signal on 60-GHz Band Subcarrier With Performance Improvement and Wavelength Reuse
- With Radio-over-Fiber RoF enabled remote antenna, Gigabit Ethernet service operating at 60-GHz frequencies can be accessed cordlessly. Due to limited linear operation region of 60-GHz optoelectronic modulators commercially available so far, optical weak modulation is required leading to limited link performance. This paper demonstrates in RoF transmission of 1.25-Gigabit Ethernet...
- Tags: Performance, IEEE, Fiber, Performance Management, Network Technology, Ethernet, Networking, Human Resources, Workforce Management
- White papers 2007-06-01
- Digital Transmission: Carrier-To-Noise, Signal-To-Noise & Modulation Error Ratio
- This paper provides a background on several signal quality metrics applicable to CMTS and cable network operation and how they relate to overall performance. The CMTS upstream SNR and cable modem or STB downstream SNR estimates are explained. Noise, as discussed in this paper and unless defined otherwise, refers to...
- Tags: Cable Network, Noise, Cable, Network Technology, Tv & Home Theater, Telecommunications, Personal Technology, Networking
- White papers 2006-11-01
- Mark Cuban on downloading movies: We're better off with preloaded hard drives sent UPS
- Mark Cuban on downloading movies: We're better off with preloaded hard drives sent UPSHow about Columbia House?The monthly "featured" download that you automatically get unless you tell them not to. Get 13 movies for a penny, as long as you buy 3 more at regular prices in the next two...
- Tags: WiMAX, PRODUCTIVITY, DVD-quality video, STREAMING Paradigm, Mbps, Mark Cuban, bandwidth, hard drive, United Parcel Service of America Inc.
- Discussion threads 2006-09-06
- Airlines ban cell phones -- but why?
- Airlines ban cell phones -- but why?cell phones on aircraft...I ahve been in the industry cell pohnes working as an engineer for over 15 years.This is a response by me of an email i recieved about the possibilty of using cell pohnes in aircraft.the original email referenced this article...http://www.physics911.net/projectachilles.htma test...
- Tags: Cellular phones, cell phone, cell, phone
- Discussion threads 2006-07-14
- Troubleshooting Digitally Modulated Signals With a QAM Analyzer
- Quadrature Amplitude Modulation QAM is a modulation scheme which conveys data by changing modulating the amplitude of two carrier waves. This paper gives an overview of the features available in many QAM analyzers, and more importantly, how to use those features to troubleshoot problems with digitally modulated signals. This understanding...
- Tags: Signal, Cisco Systems Inc., Quadrature Amplitude Modulation, Cable, Telecommunications, Personal Technology
- White papers 2006-06-13
- Performance Degradation of OFDM Systems Due to Doppler Spreading
- The focus of this paper is on the performance of Orthogonal Frequency Division Multiplexing OFDM signals in mobile radio applications, such as 802.11a and Digital Video Broadcasting DVB systems, e.g., DVB-CS2. The paper considers the evaluation of the error probability of an OFDM system transmitting over channels characterized by frequency...
- Tags: Performance, OFDM, Wireless
- White papers 2006-06-01
- Advanced Design Methods of Doherty Amplifier for Wide Bandwidth, High Efficiency Base Station Power Amplifiers
- This paper has proposed advanced design methods of Doherty amplifier for high efficiency base station power amplifiers with wide bandwidth. First, the paper develops Doherty amplifier with uneven power drive which is provided more input power to the peaking cell than the carrier cell for full power operation and appropriate...
- Tags: Bandwidth, Amplifier, Design Method
- White papers 2005-10-18
- Improving Bandwidth Utilization by Implementing DOCSIS 2.0 Logical Channels
- DOCSIS 2.0 support for logical channels allows cable operators, who deploy standards-based DOCSIS 2.0 Cable Modem Termination System CMTS platforms, to provide significant amounts of increased upstream bandwidth. They can quickly deliver increased upstream performance to HFC networks consisting of mixed mode DOCSIS 1.x and 2.0 cable modems as well...
- Tags: Cable Modem, DOCSIS, Cable, Broadband Internet, Modems, Telecommunications, Personal Technology, Hardware, Components
- White papers 2005-08-25
- Getting beyond the WiMAX hype
- Getting beyond the WiMAX hypeOne sided commentary...George, if someone read just your commentary they would be left with the idea there is no reason to develop WiMAX. That just isn't true.George, are you dismissing theWiMAX grid?Where commuication hops from one WiMAX system to the next as needed?True it isn't...
- Tags: WIRELESS, Wireless LANs, WiMAX, Wi-Fi
- Discussion threads 2005-07-20
- Orthogonal Frequency Division Multiplexing for Wireless Communications
- Orthogonal frequency division multiplexing OFDM is a promising technique for high-data-rate wireless communications because it can combat inter-symbol interference ISI caused by the dispersive fading of wireless channels. The proposed research focuses on techniques that improve the performance of OFDM based wireless communications and its commercial and military applications. In...
- Tags: Wireless Communication, OFDM, Wi-Fi, Wireless
- White papers 2004-11-16
- OFDM or Single-Carrier Block Transmissions?
- This paper compares two block transmission systems over frequency-selective fading channels: orthogonal frequency-division multiplexing OFDM versus single-carrier modulated blocks with zero padding ZP. It first compares their peak-to-average power ratio PAR and the corresponding power amplifier backoff for phase-shift keying or quadrature amplitude modulation. Then it studies the effects of...
- Tags: Channel, University Of Minnesota, OFDM, Wireless
- White papers 2004-03-01
- ICI Cancellation Based Channel Estimation for OFDM Systems
- Orthogonal Frequency Division Multiplexing OFDM), which is a multicarrier modulation scheme, splits high data rate information symbols into lower rate parallel data streams and transmits this parallel information on different orthogonal carriers. The loss of orthogonality among subcarriers causes inter-carrier interference ICI, which affects both channel estimation and detection of...
- Tags: University Of South Florida, Channel Estimation, Channel Estimation Error, OFDM, Wireless
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