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- 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
Additional Resources
- 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
- 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
- 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
- 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
- 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
- Low-Complexity Time-Domain ICI Equalization for OFDM Communications Over Rapidly Varying Channels
- This paper considers wireless OFDM communications over rapidly varying channels as occurring e.g. in high-mobility scenarios. Here, InterCarrier Interference ICI is the major source of impairment that limits the transmission quality. This paper proposes novel equalizers to combat ICI and enable reliable communications even at high Doppler frequencies. In contrast...
- Tags: Channel, Vienna University, OFDM, Wireless
- White papers 2006-11-28
- Complexity is not always bad, only needs to be justified
- There is good complexity and bad complexity. Bad complexity includes infrastructure that has redundant components, that is, multiple types of components to provide the same service. This was addressed in the article. Good complexity includes: 1. business features that are useful and used, 2.infrastructure that is more complex...
- Tags: wdk@...
- Discussion threads 2007-03-19
- 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
- Rapid MIMO-OFDM Software Defined Radio System Prototyping
- Multiple Input-Multiple Output MIMO is an attractive technology for future wireless systems. MIMO communication, enabled by the use of multiple transmit and multiple receive antennas, is known for its high spectral efficiency as well as its robustness against fading and interference. Combining MIMO with Orthogonal Frequency Division Multiplexing OFDM, it...
- Tags: Radio, MIMO, MIMO-OFDM, OFDM, Wireless
- White papers 2006-06-20
- complexity password windows 2003 sever
- HI all ,I have installed windows 2003 sever and i am facing a problem of password complexity how i can finish the complexity and then i can creat a normal password users.Ajmal hussain minhas
- Tags: ajmalhminhas@..., password
- Discussion threads 2007-05-07
- Reference Frame Optimization for Multiple-Path Video Streaming With Complexity Scaling
- Recent video coding standards such as H.264 offer the flexibility to select reference frames during motion estimation for predicted frames. This paper studies the optimization problem of jointly selecting the best set of reference frames and their associated transport QoS levels in a multipath streaming setting. The application of traditional...
- Tags: Complexity, Optimization, Engineering
- White papers 2007-06-01
- The Sound Check Trainer (zip)
- Training course for beginning sound engineers. Great for band or church sound engineers. Explains the basics of setting up and sound checking a live band; start to finish. The training course covers connections, microphone and speaker placement,equalization, feedback elimination, and more.
- Tags: Training, RF Media, Workforce Management, Training And Certification, Human Resources
- Software downloads 2008-10-24
- Reducing Retail Complexity
- The complexity of much of today's disjointed enterprise infrastructure software impedes retailers' business agility and productivity. Customers have spoken, saying, "The software industry has made licensing far too complex"; "The costs of selecting, acquiring, and deploying software are too unpredictable"; and "The industry's mismatched release schedules create complexity for us."...
- Tags: Software, Complexity, Sun Microsystems Inc., Retail Company, Retail, Tools & Techniques, Management
- White papers
- CONMan: Taking the Complexity Out of Network Management
- Network management is difficult, costly, and error prone, and this is becoming more so as network complexity in-creases. This paper argues that this is an outcome of two fundamental flaws in the existing architecture: the management plane depends on the data plane, and network device management interfaces are varied, complex,...
- Tags: Network, Network Management, Networking
- White papers 2006-09-15
- The Complexity of Connectivity in Wireless Networks
- This paper defines and studies the scheduling complexity in wireless networks, which expresses the theoretically achievable efficiency of MAC layer protocols. Given a set of communication requests in arbitrary networks, the scheduling complexity describes the amount of time required to successfully schedule all requests. The most basic and important network...
- Tags: Complexity, Network, Wireless Network, Wi-Fi, Wireless, Networking
- White papers 2005-12-01
- Generic MMSE Decision Directed Channel Estimation for OFDM and MC-CDMA
- This paper proposes a reduced-complexity MMSE SS-CIR estimator, which is suitable for employment in both DDCE-aided OFDM and MC-CDMA systems. The paper shows that the performance of the reduced-complexity MMSE method proposed is at least as good as that of its high complexity counterpart, while its complexity does not exceed...
- Tags: OFDM, Wireless
- White papers 2005-10-11
- A Low Complexity Tree Algorithm for PTS-Based PAPR Reduction in Wireless OFDM
- Orthogonal Frequency Division Multiplexing OFDM has several attributes which make it a preferred modulation scheme for high speed wireless communications. However, its high Peak-to-Average-Power Ratio PAPR causes nonlinear distortion thus limiting the efficiency of the transmitter's High Power Amplifier. Among the approaches proposed for PAPR mitigation, the Partial Transmit Sequence...
- Tags: Distortion, Algorithm, IEEE, OFDM, Wi-Fi, Wireless, Productivity
- White papers 2006-04-19
- A Reduced Complexity, Improved Frequency Offset Estimation for OFDM-Based WLANs
- This paper presents a reduced complexity frequency offset estimation method as a modification to the nonlinear least square NLS method. The complexity reduction is achieved by utilizing the Chirp-Z transform. At similar complexity, the estimation performance gain, de-fined as the mean square error ratio between the NLS method and the...
- Tags: Method, WLAN, University Of Texas, Training, Complexity Reduction, Workforce Management, OFDM, Wireless LANs, Wireless, Human Resources
- White papers
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