Search for dissertations about: "low-density parity-check codes"
Showing result 1 - 5 of 21 swedish dissertations containing the words low-density parity-check codes.
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1. Low-density parity-check codes : unequal error protection and reduction of clipping effects
Abstract : The invention of low-density parity-check (LDPC) codes made reliable communication possible at transmission rates very close to the theoretical limit predicted by Shannon. However, communication close to the Shannon limit requires very long codes and results in long delay and high encoder and decoder complexity. READ MORE
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2. Analysis of Some Convolutional Coding Constructions
Abstract : This thesis focuses on different convolutional coding constructions for digital communication systems, and on methods to analyze these constructions. The work presented in the thesis can be divided into three main areas; error probability bounds for convolutional codes, analysis of multilevel modulation, and investigation of low-density parity-check convolutional codes. READ MORE
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3. Iteratively Decodable Convolutional Codes: Analysis and Implementation Aspects
Abstract : This thesis addresses the theory and implementation aspects of iteratively decodable codes. Iteratively decodable codes include, in particular, Gallager's regular low-density parity-check (LDPC) codes, Tanner's generalized LDPC (GLDPC) codes, turbo codes due to Berrou et. al. and expander codes. READ MORE
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4. Codes on Graphs and More
Abstract : Modern communication systems strive to achieve reliable and efficient information transmission and storage with affordable complexity. Hence, efficient low-complexity channel codes providing low probabilities for erroneous receptions are needed. READ MORE
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5. Towards a Theory of Codes for Iterative Decoding
Abstract : Channel codes in combination with iterative decoding techniques are a both powerful and efficient method to protect data against disturbances in digital communication systems. This thesis deals with various code constructions for block-wise and continuous transmission that have the potential to achieve low bit error rates with iterative decoding, even when operating close to the Shannon limit. READ MORE