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.
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Showing 1 to 20 of 231 for “"turbo"”.
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OFDM turbo transceivers
… Multiplexing (OFDM). More explicitly, powerful turbo transceivers invoking Sphere Packing (SP) modulation are designed using EXtrinsic Information Transfer (EXIT) charts for both single-user and multi-user transmission. In order to provide an attractive suite of single-user OFDM transceivers, we …
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Adaptive, Turbo-coded OFDM
… throughput of a working OFDM system by adding turbo coding and adaptive modulation (AD). Simulation is done over a time varying, frequency selective Rayleigh fading channel. The temporal variations in the simulated wireless channel are due to the presence of Doppler, a sign of relative motion …
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Source-controlled block turbo coding
This thesis proposes the use of block turbo codes for transmitting nonuniform binary memoryless sources over AWGN channels. As opposed to standard convolutional turbo codes, block turbo codes are known to achieve good performance for high code rates, up to 98% of the channel capacity for uniform …
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Adaptive Channel Estimation for Turbo Decoding
A new adaptive filter is proposed for the turbo decoding on Rayleigh fading channels with noisy channel estimates. The extrinsic information generated from the turbo decoder has some priority information about the transmitted data bits, which can help us better understand the channel characters. By …
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On the Design of Turbo Codes
This thesis is about Turbo codes - codes constructed via parallel concatenation of two recursive convolutional encoders linked by an interleaver. The focus of the work is on the understanding and design of Turbo codes. This includes thorough investigation of central components that influence Turbo …
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Turbo coding in correlated fading channels
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Economy characteristics of V.P.I. Turbo-generator units
In the operation of combined heating and power plants, there are two serious threats to economy as measured by fuel consumption for the service rendered. These are loss or exhaust steam to the atmosphere and, less serious, exhaust or steam to a condenser. The greater part of the heat supplied to …
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Turbo coding and equalization for wireless communication systems
Turbo coding, a forward error correcting coding (FEC) technique, has made near Shannon Limit performance possible when Iterative decoding algorithms are used. Intersymbol interference (ISI) is a major problem in communication systems when information is transmitted through a wireless channel. …
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The Study of Turbo Codes and Iterative Decoding
… the average BER performance of the finite-length turbo codes in the form of a lower bound. The amount of computation needed to obtain the lower bound is much less than a full simulation of the iterative turbo decoding. Based on the proposed methodologies, we discuss the guideline for the design of …
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Feasibility of electrostatic bearings for micro turbo machinery
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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A density evolution analysis of turbo product codes
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Simulating Turbo codes using a modular simulation platform
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Evaluation of Soft Output Decoding for Turbo Codes
Evaluation of soft output decoding for turbo codes is presented. Coding theory related to this research is studied, including convolutional encoding and Viterbi decoding. Recursive systematic convolutional (RSC) codes and nonuniform interleavers commonly used in turbo code encoder design are …
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The analytical design of a turbo-jet combustion chamber.
A "can" type combustion chamber was designed using all available proved concepts. A survey of existing designs was made to arrive at a logical design point. The fact that parallel flow would exist within the chamber was noted, and the burner was designed to obtain the required flow within an equal …
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An investigation of Turbo Codes over Mobile Wireless Channels
Turbo codes have been the subject of much research in recent years, producing results very close to the theoretical limit set by Shannon. The codes have been successfully implemented in satellite and video conferencing systems and provision has been made in 3rd generation mobile systems. These …
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A Turbo Approach to Distributed Acoustic Detection and Estimation
Networked, multi-sensor array systems have proven to be advantageous in the sensor world. A large amount of research has been conducted with these systems, with a main interest in data fusion. Intelligently processing the large amounts of data collected by these systems is required in order to …
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Turbo space-time coded modulation : principle and performance analysis
… in coding was achieved with the invention of turbo codes. Turbo codes approach Shannon capacity by displaying the properties of long random codes, yet allowing efficient decoding. Coding alone, however, cannot fully address the problem of multipath fading channel. Recent advances in …
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Distributed Turbo Product Coding Techniques Over Cooperative Communication Systems
… communications framework based on Distributed Turbo Product Code (DTPC). The system uses linear block Extended Bose-Chaudhuri-Hochquenghem (EBCH) codes as component codes. The source broadcasts the EBCH coded frames to the destination and nearby relays. Each relay constructs a product code by …
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