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 66 for “"trellis"”.
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Symmetries of trellis codes
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Trellis Decoding And Applications For Quantum Error Correction
… representations of error-correcting codes called trellises are a crucial tool in classical coding theory, establishing both theoretical properties and performance metrics for practical use. The idea was extended to quantum error-correcting codes by Ollivier and Tillich in 2005. Here, we use their …
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Design of a simulation for trellis coded modulation
… communication links, at reasonable prices. Trellis coded modulation is a fairly recent development in the technology of digital communications that has helped to meet an aspect of this demand. The Department of Electrical Engineering at the University of Cape Town had not undertaken any …
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Sequential decoding of trellis codes through ISI channels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Unequal error protection codes based on trellis shaping
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1995.
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Performance study and improvement of Ungerboeck-type trellis codes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Trellis-based iterative decoding of block codes for satellite ATM
… codes, and where the decoding method used is the trellis-based iterative Maximum A posteriori Probability (MAP) algorithm which provides an optimal performance. We aim to apply our turbo coding scheme to Asynchronous Transfer Mode (ATM) applications in Digital Video Broadcast - Return Channel via …
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Impact of Channel Estimation Errors on Space Time Trellis Codes
Space Time Trellis Coding (STTC) is a unique technique that combines the use of multiple transmit antennas with channel coding. This scheme provides capacity benefits in fading channels, and helps in improving the data rate and reliability of wireless communication. STTC schemes have been primarily …
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DSP implementation of trellis coded modulation and distributed space time coding
Trellis coded modulation (TCM) combines convolutional coding with modulation, and offers approximately 2--3 dB of coding gain without requiring a corresponding bandwidth expansion. This thesis describes the process of encoding TCM, convolutional codes, decoding using the Viterbi Algorithm (VA), …
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Trellis-coded permutation modulation for improved performance of narrowband noncoherent FSK
… efficiency. To overcome this problem, we apply trellis-coded modulation (TCM) , which is a combined technology of convolutional coding and modulation, to FSK permutation. TCM was originally designed for coherent modulation. The application of TCM to permutation modulation retains the fundamental …
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Design and testing of a real time simulation for Trellis Coded Modulation
… is to build and test a real time simulation for Trellis Coded Modulation(TCM). The tests to be performed are a comparison between Ungerboeck and pragmatic codes and varying and observing different Viterbi decoder parameters for coded 8PSK. TCM is coded modulation which means the choice of …
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Root restriction, under-trellis cover cropping, and rootstock modify vine size and berry composition of Cabernet Sauvignon
… factors included root manipulation, under-trellis ground cover, and rootstock. Treatment levels were root bag (RBG) or no root manipulation (NRM); under-trellis cover crop (CC) or herbicide strip (HERB); and one of three rootstocks: 101-14, Riparia Gloire, or 420-A. Effects of these …
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Trellis Coded Modulation Schemes Using A New Expanded 16-Dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying Constellation
… set-partitioned and used in a multidimensional Trellis-Coded Modulation scheme along with a convolutional encoder of rate 2/3. Effective gain of 2.67 dB over uncoded CEQ2PSK constellation with low complexity is achieved theoretically. A coding gain of 2.4 dB with 8 dB SNR is obtained by using …
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Fast, Metadata-private Anonymous Broadcast
This thesis presents Trellis: a mix-net based anonymous broadcast system with cryptographic security guarantees. Trellis can be used to anonymously publish documents or communicate with other users, all while assuming full network surveillance. In Trellis, users send messages through a set of …
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The Impact of Channel Estimation Error on Space-Time Block and Trellis Codes in Flat and Frequency Selective Channels
… Space-Time Block codes (STBC) and Space-Time Trellis codes (STTC) have been the subject of many investigations. Both techniques provide a means for combatting the effects of multipath fading without adding much complexity to the receiver. This is especially useful in the downlink of wireless …
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On the construction, dimensionality, and decoding of linear block code trellises
… In this thesis, we consider several aspects of trellis-based ML, and 'near-ML', soft-decision decoding of general linear block codes. ML decoding is feasible for reasonably compact trellises using the Viterbi algorithm. For general linear block codes we present simple methods for trellis …
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Error -Correcting Codes on Graphs: Lexicodes, Trellises and Factor Graphs
… on decoding with a layered graph known as a trellis, we examine generalization of heuristically good codes called lexicodes. We propose and analyze a method for designing generalized lexicodes that minimize or constrain various trellis decoding parameters. The second technique is based on …
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A comparison of two novel channel coding techniques for CDMA
… coding techniques are available, including "trellis codes" specifically designed for CDMA, very low rate convolutional codes and conventional convolutional codes. An analytic approach is developed to compare the performance of different coding techniques for CDMA on the same basis by …
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Iterative Decoding and Channel Estimation over Hidden Markov Fading Channels
… fading channel (MFC) can be conceptualized as a trellis, and that the transmission of a sequence over a MFC can be viewed as a trellis encoding process much like convolutional encoding. The thesis demonstrates that either maximum likelihood sequence estimation (MLSE) algorithms or maximum <I> a …
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