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TechRepublic Resources
- Geek Trivia: Stationary perspective
- Your grasp of linear time is not offYo Geek:I thought that you would be interested to know that 'technically' you comment regarding Obi-Wan's famous quote is not off and therefore not subject to inquiry by the Department of Temporal Investigations.As you may recall, Star Wars begins by flashing their 'disclaimer'..."A...
- Tags: equalization, pressure equalization, valve, star wars, space station, temporal mechanics, gulmiguel, career, cabin, Soyuz
- Discussion threads 2006-04-19
- Edit digital media content
- By Joseph T. SinclairSound editingThe key to creating quality streaming audio is to make the signal as strong as possible without creating distortion.Audio editing programs not only record but also enable sound editing and filtering so that you can both improve the quality of and rearrange your audio. Audio editing...
- Tags: Corporate communications, digital media, video, video editing, audio
- Technical articles 2003-09-29
Additional Resources
- Point-to-Point Transmission Over MIMO Channels With Intersymbol Interference: Comparison of Single- and Multicarrier Modulation
- In MIMO orthogonal frequency division multiplexing, temporal equalization is performed by applying OFDM, which decomposes the MIMO ISI channel into a set of independent flat fading MIMO channels. For each of this parallel channels the carriers, spatial equalization, e.g., via V-BLAST, is performed individually. Conversely, in MIMO decision-feedback equalization both...
- Tags: MIMO, OFDM, Wireless
- White papers 2004-09-07
- Channel Modeling and Associated Inter-Carrier Interference Equalization for OFDM Systems With High Doppler Spread
- This paper addresses the problem of OFDM transmission over a time-varying, frequency-selective channel with high Doppler spread.. This paper analyzes the CP-OFDM transmission mechanism, and the impairments due to the channel variations, using a decomposition of these variations over a base of sinusoid functions sampling the Doppler spectrum at subcarrier...
- Tags: Channel, Modeling, OFDM, Research & Development, Wireless, Business Operations
- White papers
- A Space-Time FIR Equalizer Training Algorithm for MIMO-OFDM Systems
- This paper proposes several new direct training-based methods for FIR space-time equalizer design in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems employing spatial multiplexing. This paper proposes a two-stage receiver structure consisting of an initial space-time equalization for suppressing the Co-Channel Interference CCI, shortening the channel, and mitigating asynchronicity...
- Tags: Algorithm, Training, MIMO-OFDM, Workforce Management, Human Resources
- White papers 2004-10-27
- Pilot-Tone Based ZP-OFDM Demodulation for an Underwater Acoustic Channel
- Existing coherent underwater acoustic communication systems rely on single carrier transmission and adaptive decision feedback equalization to deal with time-varying and highly dispersive UnderWater Acoustic UWA channels. Equalization complexity prevents any substantial rate improvement with the existing single-carrier approach, as the channel frequency selectivity increases considerably when the symbol rate...
- Tags: Channel, Equalization Complexity, OFDM, Wireless
- White papers 2006-07-26
- A Pseudorandom Postfix OFDM Modulator - Semi-Blind Channel Estimation and Equalization
- This paper details a new Orthogonal-Frequency-Division-Multiplexing OFDM modulator based on the use of a PseudoRandom Postfix PRP-OFDM and discusses low-complexity equalization and channel estimation/tracking architectures. The main property of this new modulation scheme is the ability to estimate and track the channel variations semi-blindly using order-one statistics of the received...
- Tags: IEEE, OFDM, Wireless
- White papers 2006-03-01
- Minimum-Output-Energy Method for Blind Equalization of OFDM and Systems With Sufficient or Insufficient Cyclic Prefix
- In this paper, a new blind equalization method is proposed for systems with cyclic prefix such as OFDM. With constrained Minimum-Output-Energy MOE optimization, a bank of equalizers can be derived without the help of FFT/IFFT. Algorithms are developed for blindly estimating the constraints and equalizers. When the cyclic prefix is...
- Tags: Method, Property, OFDM, Wireless
- White papers
- Latency Equalization: A Programmable Routing Service Primitive
- Today the Internet is the primary medium for deploying new real time services such as gaming and distributed online live music concerts. Different network services have different expectations from the routing infrastructure. Some network services require conventional routing paths optimized for low latency or low congestion. However, real-time interactive services...
- Tags: Latency, Network, Network Service, Association For Computing Machinery, Networking
- White papers 2008-08-22
- AVD Graphic Studio (zip)
- Looking for an image processor that would offer advanced options and features, yet would not cost a fortune? AVD Graphic Studio, to put it simply, is a mini Photoshop, offering very similar capabilities at a fraction of the cost. It provides over 20 tools to work with images cropping, resizing,...
- Tags: Image Processing
- Software downloads 2007-01-30
- Min-SER Space-Time Equalization in Asynchronous MIMO-OFDM Systems
- In this paper, the authors propose an algorithm for the design of space-time equalizer in asynchronous MIMO-OFDM systems. The equalizer is designed to null the co-channel interference and combat asynchronism as well as minimize a lower bound to the symbol error rate. Numerical simulations show good uncoded bit error rate...
- Tags: Algorithm, University Of Texas, MIMO-OFDM, Equalizer, Engineering
- White papers 2005-04-27
- An Introduction to Software Radio
- A software radio is a wireless communications device in which all of the signal processing is implemented in software. By simply downloading a new program, a software radio is able to interoperate with different wireless protocols, incorporate new services, and upgrade to new standards. This paper provides an introduction to...
- Tags: Software, Radio, Software Radio, Advertising & Promotion, Tools & Techniques, Wi-Fi, Wireless, Marketing, Management
- White papers
- IEEE 802.11b
- IEEE 802.11 specifies a 2.4 GHz operating frequency with data rates of 1 and 2 Mbps using either Direct Sequence Spread Spectrum DSSS or Frequency Hopping Spread Spectrum FHSS. This white paper starts with introduction to IEEE 802.11b and then describes CCK used in IEEE 802.11b, Walsh and Complementary Codes...
- Tags: IEEE 802.11, Wireless LANs, Wi-Fi, Wireless
- White papers 2003-10-23
- MUSIC for OFDM by Using an Uniform Antenna Array With Two Elements
- Multicarrier Communication MC has capability of high speed transmission, fading combating, and simplicity of equalization leading to its widely application. Among many MC applications, OFDM Orthogonal Frequency Division Multiplex is a very promising candidate. In addition, problem of DOA Direction Of Arrival estimation using MUSIC algorithm is solved for point...
- Tags: Estimation, Algorithm, Music, Multicarrier Communication, OFDM, Engineering, Wireless
- White papers 2005-06-16
- Training Sequence Vs. Cyclic Prefix: A New Look on Single Carrier Communication
- This paper introduces a new Training-Aided Single Carrier TASC scheme taking advantage of the Cyclic Prefix nature of a short Training Sequence TS. This allows to perform frequency domain equalization, like for the Single Carrier with Cyclic Prefix (CP-SC) scheme. The modification of the CP in a TS allows to...
- Tags: Training, Workforce Management, Human Resources
- White papers
- Comparison of Vector Detection Algorithms for MIMO-OFDM
- The aim of this paper is to compare detection algorithms for MIMO-OFDM transmissions by simulation. For a coded transmission, it turns out that the list sphere detector, which has been considered a favorite for many applications, is far more complex than other methods yielding the same BER performance. Moreover, iterative...
- Tags: Algorithm, Channel, Reed Elsevier Inc., MIMO-OFDM
- White papers 2005-05-20
- Joint Time-Domain Tracking of Channel and Frequency Offset for OFDM Systems
- This paper addresses the problem of joint channel and frequency offset estimation and tracking for OFDM systems. The proposed method is based on Extended Kalman filtering. The channel taps and the frequency offset are estimated in time-domain while equalization is performed in frequency domain. Simulation results demonstrate accurate tracking capability...
- Tags: Frequency, Channel, Method, OFDM, Wireless
- White papers 2006-03-21
- Fixed-Point Modeling Using Simulink & the Signal Processing Blockset (UWB)
- Simulink, when combined with the Signal Processing Blockset, enables engineers to quickly and effectively create bit-accurate product-level and algorithm-level specifications. This webinar will explore finite word length effects on system performance and other design trade-offs when moving from floating-point to fixed-point data types. Using an application example based on the...
- Tags: UWB, Signal Processing, MathWorks, Ultrawideband (UWB), Wireless
- Webcasts
- Efficient MIMO Equalization for Downlink Multi-Code CDMA: Complexity Optimization and Comparative Study
- This paper presents an efficient LMMSE chip equalizer to suppress the interference caused by the multipath fading channel in the MIMO Multi-Code CDMA downlink. The block-Toeplitz structure in the correlation matrix is approximated with a block circulant matrix. An FFT-based algorithm is applied to avoid the Direct-Matrix-Inverse DMI in the...
- Tags: Algorithm, Matrix, Nokia Corp., Optimization, MIMO, Engineering
- White papers 2004-08-27
- BER Performance of OFDM System in Frequency-Selective Rician Fading With Diversity Reception
- This paper theoretically studies the Bit Error Rate BER performance of OFDM systems with MDPSK modulation for subchannels in frequency-selective flat Rician fading and Additive White Gaussian Noise AWGN. Both the Rayleigh and Rician fading conditions are considered. The differential detection technique is used to avoid the need of a...
- Tags: Performance, Singapore, Detection Technique, OFDM, Performance Management, Wireless, Human Resources, Workforce Management
- White papers
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