Search for dissertations about: "block codes"

Showing result 11 - 15 of 50 swedish dissertations containing the words block codes.

  2. 11. On the Construction and Analysis of Iteratively Decodable Codes

    Author : Dmitri Truhachev; Institutionen för elektro- och informationsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Computer science; minimum distance; cycles; asymptotic performance; turbo codes; iterative decoding; low-density parity-check codes; numerical analysis; systems; control; Datalogi; numerisk analys; system; kontroll;

    Abstract : Iterative decoding methods allow efficient decoding of long codes that are composed of smaller component codes. As a result reliable communication can be achieved with low decoding complexity even for rates close to Shannon capacity. This makes iteratively decodable codes a very attractive object of study in modern coding theory. READ MORE

  4. 12. Bounds on the Performance of PSK Block Codes

    Author : Efraim Laksman; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In wireless communication, the minimum Euclidean distance between codewords is a major factor for the ability to correct errors in messages, and it is of interest to maximize the minimum Euclidean distance. The thesis improves previously established general upper bounds on minimum Euclidean distance of phase shift keying block codes. READ MORE

  5. 13. Structured LDPC convolutional codes

    Author : Zhongwei Si; Mikael Skoglund; Ragnar Thobaben; Michael Lentmaier; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SRA - ICT; SRA - Informations- och kommunikationsteknik;

    Abstract : LDPC convolutional codes, also known as spatially coupled LDPC codes, have attracted considerable attention due to their promising properties. By coupling the protographs from different positions into a chain and terminating the chain properly, the resulting convolutional-like LDPC code ensemble is able to produce capacity-achieving performance in the limit of large parameters. READ MORE

  6. 14. Hybrid ARQ using serially concatenated block codes for real-time communication : an iterative decoding approach

    Author : Elisabeth Uhlemann; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; serially concenated block codes; ARQ; trellis; iterative detection; real-time;

    Abstract : .... READ MORE

  7. 15. Finite-Length Scaling Laws for Spatially-Coupled LDPC Codes

    Author : Roman Sokolovskii; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; belief propagation decoding; spatially-coupled LDPC codes; window decoding; codes-on-graphs; finite-length code performance;

    Abstract : This thesis concerns predicting the finite-length error-correcting performance of spatially-coupled low-density parity-check (SC-LDPC) code ensembles over the binary erasure channel. SC-LDPC codes are a very powerful class of codes; their use in practical communication systems, however, requires the system designer to specify a considerable number of code and decoder parameters, all of which affect both the code’s error-correcting capability and the system’s memory, energy, and latency requirements. READ MORE