Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"channel equalization"”.
-
Wireless Channel Equalization in Digital Communication Systems
… problems caused in the multipath fading wireless channels. Our quest is to remove one of the obstacles in the way of achieving ultimately fast and reliable wireless digital communication, namely Inter-Symbol Interference (ISI), the intensity of which makes the channel noise inconsequential.</p> …
-
Channel equalization for self-synchronizing chaotic systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
-
Jointly optimal pre- and post-channel equalization and distributed beamforming in asynchronous bi-directional relay networks
… both transceivers. In this work, pre- and post-channel equalization blocks are used to combat ISI. The mean-squared error of the estimated received signals at both transceivers is minimized under a total transmit power budget by optimally obtaining the transceivers’ powers and relay beamforming …
-
Design of optimal equalizers and precoders for MIMO channels
Channel equalization has been extensively studied as a method of combating ISI and ICI for high speed MIMO data communication systems. This dissertation focuses on optimal channel equalization in the presence of non-white observation noises with unknown PSD but bounded power-norm. A worst-case …
-
Iterative Techniques Based on Energy Spreading Transform for Wireless Communications
… algorithms for communication systems over fading channels. They include channel equalization to combat intersymbol interference (ISI) and multiple input multiple output (MIMO) signal detection to deal with multiple access interference (MAI) from other transmit antennas. As the demand for higher …
-
Projection Methods for Improved Performance in Adaptive Systems
… of applications including system identification, channel equalization, two-dimensional adaptive processing, adaptive interference suppression, and adaptive fault tolerance. In each application, significant advantages were discovered to using the projection algorithms and framework.
-
Dispersive neural networks for adaptive signal processing
… including signal prediction, signal production, channel equalization, and spatio-temporal pattern recognition. For comparison with conventional techniques, a dispersive network was trained to predict future values of a chaotic signal using only its present value as an input. With adaptable …
-
Digital equalization techniques for the compensation of nonlinear impairments in long-haul coherent optical communication systems
… in order to achieve 400 Gb/s and 1 Tb/s per channel. Major transmission impairments e.g., CD, PMD and Self-Phase Modulation (SPM) can be compensated using electronic equalization. Fiber nonlinearities such as nonlinear phase noise, and inter-channel four wave mixing are not compensated and …
-
Blind multidimensional matched filtering for wireless channelswith multiple antennas
… most crippling handicaps of implementing a blind channel estimation scheme in a wireless receiver. The state-of-the-art blind channel estimation methods either need matrix decomposition methods, which are implementation inefficient and expensive, or higher order cumulant functions of the received …
-
Cyclic prefix assisted block transmission for low complexity communication system design
… studied: the CP based low-complexity schemes for channel equalization and channel estimation. Specifically, based on the simple frequency domain equalization, a low complexity joint receiver is proposed for CP-CDMA system, which is a special application of block transmission. And in this work the …
-
Factor graphs and MCMC approaches to iterative equalization of nonlinear dispersive channels
In this work, equalization for nonlinear dispersive channels is considered. Nonlinear communication channels can lead to significant degradations when nonlinearities are not taken into account at either the receiver or the transmitter. In many cases, the nonlinearity of the channel precludes the …
-
Partial Update Adaptive Filtering
… as system identification, noise cancellation, channel equalization, and beamforming. In practical applications, the computational complexity of an adaptive filter is an important consideration. The Least Mean Square (LMS) algorithm is widely used because of its low computational complexity …
-
Underwater acoustic communications and adaptive signal processing
… The ocean experimental results show that without channel equalization, the full tail-biting convolution (FTBC) codes with short packet lengths not only can perform similarly to zero-tailing convolution (ZTC) codes in terms of bit error rate (BER) in the PHY layer. Computer simulation results show …
-
Asynchronous bi-directional relay-assisted communication networks
… Such a network can be viewed as a multipath channel which can cause inter-symbol-interference (ISI) in the signals received by the two transceivers. Hence, we model such a communication scheme as a frequency selective multipath channel which produces ISI at the two transceivers, when the data …
-
Ambiguities in range-based system identification
… in several applications in engineering (e.g. channel equalization, super-resolution, MRI and SAR image formation). This is a special case of a bi-linear inverse problem, and is sometimes equivalent to range-based operator recovery. The aim of this research is to study the structure of …
-
A comparison of features for large population speaker identification
… more realistic environments such as telephone channels. The differences using a recognizer in clean and noisy environments are extreme, and this causes one of the major obstacles in producing commercial recognition systems to be used in normal environments. It is the lack of performance of …
-
OWSS And MIMO-STC-OFDM: Signaling Systems for the Next Generation of High Speed Wireless LANs
… and high spectral efficiency in multipath channels. This dissertation also presents a novel MIMO-STC-OFDM system which targets data rates in excess of 100 Mbps and at the same time achieve both high spectral efficiency and high performance. Simulation results validate the superior …
-
Array Signal Processing for Communications from High Altitude Platforms and Other Applications
… OFDM signal transmission in underwater acoustic channel are respectively investigated. Both conventional and adaptive beamforming methods are investigated in the application to HAP communications. A three-step footprint optimization method based on planar array and hexagonal cellular structure is …
-
Channel Related Optimization of Wireless Communication Systems
… used plays a major role to enable reliable channel estimates from a small amount of pilot symbols. Rearrangement of the pilot pattern enables a reduction in the number of needed pilot symbols up to a factor 10, still retaining the same bit error performance. The effect of the number of …
-
Underwater communication via particle velocity channels : principles, channel models, and system design
… dissertation, the concept of data detection and equalization in underwater particle velocity channels using acoustic vector sensors was developed. System equations for such a receiver were derived and channel equalization using these sensors was formulated. A multiuser system using vector sensors …
Page 1 of 2