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Frequency Bands for Broadband Wireless Access
White Papers At the 27th RSAC meeting various frequency bands available for allocation for Worldwide Interoperability for Microwave Access ("WiMax") were discussed. In RSAC it was considered that the 3.4 - 3.6 GHz band is a candidate band for WiMax.
[March 21, 2006, 0:01]
Frequency Tuner
Downloads Frequency Tuner is a program that can measure the frequency of a sound and convert it to a note. Frequency Tuner can be used to tune different instruments. Frequency Tuner was tested to tune guitar, piano, and flute.
[March 20, 2003, 17:15]
Joint Channel and Frequency Offset Estimation for OFDM Systems
White Papers In this paper, a joint channel and frequency o set estimation algorithm is proposed. The time variation of the effective Channel Impulse Response (CIR) due to frequency o set is tracked using a channel tracker.
[April 13, 2007, 1:01]
Reducing the TCP Acknowledgment Frequency
White Papers Further reduction of the acknowledgment frequency can be motivated in the same way. The results show that in scenarios where there are no obvious advantages of reducing the acknowledgment frequency, performance can be maintained although fewer...
[December 20, 2007, 0:01]
Selection Criteria for Implementing Optimum WIMAX Frequency Spectrum
White Papers This paper is about a work that was carried out by the authors in an attempt to identify technologically robust and economically viable solution for commercial implementation and installation of WIMAX optimal frequency spectrum.
[April 15, 2009, 1:22]
Impact of the Propagation Environment on the Performance of Space-Frequency Coded MIMO-OFDM
White Papers Previous work on space-frequency coded MIMOOFDM has been restricted to idealistic propagation conditions. In this paper, using a broadband MIMO channel model taking into account Ricean K-factor, transmit and receive angle spread, and antenna...
[October 26, 2004, 0:00]
WiMAX Relay Networks: Opportunistic Scheduling to Exploit Multiuser Diversity and Frequency Selectivity
White Papers The paper solves the problem of MAC scheduling in such networks so as to serve the mobiles in a fair manner while exploiting the multiuser diversity, as well as the frequency selectivity of the wireless channel.
[April 15, 2009, 1:22]
On Performance of SCH-OFDMA-CDM in Frequency Selective Indoor Environment
White Papers Performance of Sub Carrier Hopped Orthogonal Frequency Division Multiple Access Code Division Multiplexing (SCH-OFDMA-CDM) is analyzed and compared against its non hopping counterpart (OFDMA-CDM) in frequency selective indoor environment.
[April 18, 2007, 1:00]
Feasibility of Adaptive Transmission for Multicarrier and Frequency Hopping Mobile Radio Systems
White Papers The paper describes the design and performance of adaptive transmission methods enabled by the Long Range Fading Prediction algorithms (LRP) for Orthogonal Frequency Division Multiplexing (OFDM) and slow Frequency-Hopping Spread Spectrum (FH/SS...
[August 10, 2007, 10:45]
Design and Simulation of Orthogonal Frequency Division Multiplexing (OFDM) Signaling
White Papers 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 are too theoretically complex to analyze.
[January 8, 2008, 1:26]
Clock frequency race hots up
News Judging by details revealed in a chip conference agenda, the clock frequency race isn't over yet. IBM's Power6 processor will be able to exceed 5GHz (five gigahertz) in a high-performance mode, and the second-generation Cell Broadband Engine...
[January 2, 2007, 8:23]
Understanding the Key Issues in Radio Frequency Identification (RFID)
White Papers Radio frequency identification (RFID) is an automated data collection (ADC) system that enables businesses to wirelessly capture and move data using radio waves. A typical system consists of "tags" with an embedded, unique identifier for the...
[August 2, 2005, 0:00]
Orthogonal Frequency Division Multiplexing for Wireless Communications
White Papers 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.
[July 21, 2005, 6:00]
An Interpolation-Based Frequency-Synchronization Scheme for OFDM Systems
White Papers The mismatch of the oscillators in the transmitter and receiver, or Doppler shift, introduces an offset in the expected carrier frequency. In orthogonal frequency-division multiplexing (OFDM) systems, this frequency offset causes large errors in...
[July 21, 2005, 6:00]
Frequency
Downloads Frequency is a desktop weblog client that supports Blogger, Radio, Movable Type, pMachine, GeekLog (with the Blogger API plugin), EraBlog.NET, b2evo, Nucleus, and WordPress. Features include the ability to edit posts on most weblog systems, an HTML...
[April 6, 2004, 8:00]
Network-Critical Physical Infrastructure for Radio Frequency Identification (RFID) Systems
White Papers Radio Frequency IDentification (RFID) technology helps automate a variety of business processes, improving their efficiencies. It generates a huge volume of data that needs to be filtered, processed and stored, and generally requires its own...
[February 24, 2006, 0:01]
Optimal Training Signals for MIMO OFDM Channel Estimation in the Presence of Frequency Offset and Phase Noise
White Papers The authors develop robust Mean-Square Error (MSE)-optimal training signal designs for multiple-input multiple-output orthogonal frequency-division multiplexing channel estimation with frequency offset and Phase Noise (PN), and present analytical...
[April 13, 2007, 1:01]
Coherent Optical Frequency Transfer Via 110-Km Urban Fiber Network
White Papers Optical frequency at 1542 nm was coherently transferred over a 110-km optical fiber using an urban fiber network (JGN2) between Tsukuba and Kashiwa cities. The phase fluctuation induced by the fiber length fluctuation was actively reduced by...
[September 11, 2008, 1:01]
Balancing Interruption Frequency and Buffering Penalties in VBR Video Streaming
White Papers The work discussed in this paper presents a novel analytical framework, which requires only a Markov Variable Bit Rate (VBR) channel model, to study the frequency of jitters under the constraint of initial playback delay, receiver buffer size, and...
[October 22, 2008, 1:01]
Estimation of Frequency Selectivity for OFDM Based New Generation Wireless Communication Systems
White Papers In this paper, estimation of both global (long term) and local (instantaneous) frequency selectivity and rms delay spread of wireless communication channel are investigated. A practical algorithm for averaged channel frequency correlation...
[April 13, 2007, 1:01]
