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Title:
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Combined source channel decoding for image transmission over fading channels |
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Author:
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Chebil, J; Boashash, B; Deriche, M
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Abstract:
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Previous studies highlighted the importance of using residual redundancy techniques in the design of a joint source channel decoder for the case of data transmission over binary symmetrical channel. This paper uses the sequence maximum a posteriori (MAP) method, which is one of the residual redundancy techniques to design a joint source channel coding with the representation of the wireless communication channel by the Gilbert-Elliott channel (GEC). The paper also discusses the issue of parameters estimation for the GEC channel. A new modification is suggested to the Baum-Welch re-estimation technique in order to improve its performance and reduces its computational requirements. |
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Description:
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This paper presents the design of a joint source channel decoder using the sequence maximum a posteriori method, which is one of the residual redundancy techniques. The paper applies hidden Markov models to estimate the parameters of the Gilbert-Elliott channel model. A modified Baum-Welch algorithm is proposed where the estimation obtained from the direct method is taken as the initial estimates of the Baum-Welch algorithm, reducing time significantly.
Details about non-stationary systems and signals can be found in the comprehensive book on Time-Frequency Signal Analysis and Processing (see http://www.elsevier.com/locate/isbn/0080443354).
In addition, the most recent upgrade of the original software package that calculates Time-Frequency Distributions and Instantaneous Frequency estimators can be downloaded from the web site: www.time-frequency.net. This was the first software developed in the field, and it was first released publicly in 1987 at the 1st ISSPA conference held in Brisbane, Australia, and then continuously updated). |
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URI:
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http://hdl.handle.net/10576/10769
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Date:
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2003-09 |