On the performance of concatenated trellis with high-rate outer codes.
Item
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Title
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On the performance of concatenated trellis with high-rate outer codes.
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Identifier
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AAI9020809
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identifier
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9020809
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Creator
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Siveski, Zoran.
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Contributor
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Adviser: Donald L. Schilling
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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A concatenated coding scheme of moderate complexity is considered that offers high level of performance in the bandwidth constrained environment. As an inner coding scheme M-ary PSK trellis coded modulation (TCM) with small number of states is chosen. Three different outer codes are studied; the convolutional, the projection and the Reed-Solomon code. Trellis codes used alone significantly improve the error performance without expanding the bandwidth. However, only marginal improvements result with increasing code complexity, especially at moderate SNR values. With an appropriate choice of a high-rate outer code a more dramatic performance improvement is obtained at the expense of only a small overall bandwidth expansion. A convolutional outer code employing a hard decisions provides coding gain at very high SNR values only, while at moderate values the combined scheme performs worse than TCM used alone. A high-rate Reed-Solomon code or projection code employed as the outer code provides significant performance improvement at moderate SNR values while the corresponding amount of extra bandwidth is very small. It is shown that several decibels of additional coding gain can be achieved at the expense of minor bandwidth expansion.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
