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 69 for “"viterbi"”.
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An analog Viterbi decoder
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1977.
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Parallel Viterbi search algorithm for speech recognition
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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On a Viterbi decoder design for low power dissipation
… and recently in digital wireless communications. Viterbi decoders are used to decode convolutional codes. Viterbi decoders employed in digital wireless communications are complex and dissipate large power. With the proliferation of battery powered devices such as cellular phones and laptop …
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Multi-target Tracking Using on-line Viterbi Optimisation and Stochastic Modelling
To study and compare the safety of intersection, traffic scientists today typically manually monitor the intersection during several days and count how often certain events such as evasive manoeuvres occur. This is a laboursome and costly procedure. The aim of this thesis is to provide tools that …
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Low-power discrete Fourier transform and soft-decision Viterbi decoder for OFDM receivers
… demodulator and the subsequent soft-decision Viterbi decoder without any quantization involved. In this way, we claim that redundant system complexity caused by the quantization process is eliminated, thus gives better power efficiency in wireless communication systems, especially for …
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A hardware implementation of a Viterbi decoder for a (3,2/3) TCM code
The report details the design of a dedicated Viterbi decoder chip set for an Ungerboek (3,2/3) Trellis Coded Modulation code. It was the specific intention of the thesis to design a system that could be implemented on standard Field Programmable Gate Arrays (FPGA) yet still be able to cope with …
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Evaluation of Soft Output Decoding for Turbo Codes
… is studied, including convolutional encoding and Viterbi decoding. Recursive systematic convolutional (RSC) codes and nonuniform interleavers commonly used in turbo code encoder design are analyzed. Fundamentals such as reliability estimation, log-likelihood algebra, and soft channel outputs for …
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An investigation into the performance capabilities of multi-h CPFSK digital modulation
… CPFSK signals is achieved by means of the Viterbi Algorithm, applied to the multi-h phase trellis diagram. The Viterbi path metric is given by the squared euclidean distance between the particular path and the received signal.
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Improved error control techniques for data transmission
… Reed-Solomon codes can be obtained by using the Viterbi algorithm over a suitable trellis. Two-stage decoding of Reed-Solomon codes is presented. It is an algorithm by which near-optimum performance may be achieved with a complexity lower than the Viterbi algorithm. The soft-output Viterbi …
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Implementation of a Connected Digit Recognizer Using Continuous Hidden Markov Modeling
… components was used to model each digit. The Viterbi reestimation method was primarily used in the training phase to obtain the parameters of the HMM. Viterbi decoding was used for the recognition phase. The system was first implemented as an isolated word recognizer. Recognition rates …
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Investigation of a Correlation Based Technique for Rapid Phase Synchronization in the DVB-S Standard
… cannot be determined and corrected until after Viterbi decoding. Using correlation against known symbols before demodulation, the phase ambiguity can be corrected prior to Viterbi decoding, thus reducing the amount of time required to synchronize the received signal. To enhance the correlator's …
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Coding and Equalization for Radio Channels
… decision-feedback equalization (MMSE-DFE) and Viterbi decoding.
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Full-Surface Data Storage
… data density and noise levels. A multitrack Viterbi algorithm (MVA) performs well; however, the computational complexity limits the achievable data density. Equalization methods are introduced to increase achievable density. Iterative techniques based on greedy optimization are also studied. …
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High performance non-symmetric multi-h CPFSK modulator and demodulator design
… was selected as the best alternative to the Viterbi algorithm and was modified for the CPFSK implementation. The functionality of the implementation was tested using a C++ simulation. Various structures used to implement the synchronization and demodulation of Multi-hCPFSK were investigated. …
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Wireless transceiver for the TLL5000 Platform: protocol, error correction, and interface to hardware
… implementation of a convolutional encoder and Viterbi decoder, and the writing of a driver to control the wireless hardware which will all run on the TLL-SILC 6219 ARM processor attached to the TLL5000 Baseboards.
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A Hardware Implementation of a Coherent SOQPSK-TG Demodulator for FEC Applications
… is efficiently implemented by the soft output Viterbi algorithm (SOVA). The design is intended for use in a field-programmable gate array (FPGA). Simulation results of the demodulator's performance in the additive white Gaussian noise channel are compared with a Matlab reference model that is …
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Performance of GMSK and 7/4-DQPSK Modulations in Land Mobile Radio Channels
… frequency-offset diversity and soft decision Viterbi decoding. Based on the numerically computed bit error rate bound it was found that the combination of frequency- offset diversity and convolutional coding results in a very significant improvement compared to a simple differential detector …
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Implementing IS-95, the CDMA standard, on TMS320C6201 DSP
… Texas Instruments (TI) has ASIC design for Viterbi Decoder on C54x. Several of the components in the forward link process are also implemented in hardware. However, having to design a specific hardware for a particular application is expensive and time consuming. Thus, the possibility of the …
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Infrastructure development for integration of lip reading into the SUMMIT Speech Recognizer
… segment constrained Hidden Markov Modeling. A Viterbi search over the per-segment Hidden Markov Model resolves the variable asynchrony between the audio and video streams. The two streams are combined according to a relative weighting scheme, which is determined by optimizing on a held-out data …
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