Search for dissertations about: "block codes"

Showing result 16 - 20 of 50 swedish dissertations containing the words block codes.

  2. 16. Iterative decoding of product codes

    Author : Omar Al-Askary; KTH; []
    Keywords : ;

    Abstract : Iterative decoding of block codes is a rather old subjectthat regained much interest recently. The main idea behinditerative decoding is to break up the decoding problem into asequence of stages, iterations, such that each stage utilizesthe output from the previous stages to formulate its ownresult. READ MORE

  4. 17. On the Design of Error Control Coding for Wireless Communication Systems

    Author : Carl Fredrik Leanderson; Institutionen för elektro- och informationsteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; joint source-channel decoding; Electrical engineering; Elektroteknik; a posteriori probability; soft decoding; list sequence decoding; incremental redundancy; retransmission; low-rate; parallel concatenated; convolutional codes; Turbo codes; Wireless; error correction;

    Abstract : New wireless services such as mobile Internet, multimedia streaming and high speed packet data access are making their way to the market. Availability of low-cost equipment providing high transmission quality and efficient spectrum utilization is crucial to the success of these services. READ MORE

  5. 18. Ternary Codes with Weight Constraints

    Author : Mattias Svanström; Faina Solovieva; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : We study the problem of maximizing the size of a ternary block code with given length and minimum Hamming distance. The problem is further restricted in two different ways. Either we require all codewords to have constant Hamming weight, or we require all codewords to have constant composition. READ MORE

  6. 19. Low-density parity-check codes : unequal error protection and reduction of clipping effects

    Author : Sara Sandberg; David Declercq; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

    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

  7. 20. Spatially Coupled Turbo-Like Codes

    Author : Saeedeh Moloudi; Kommunikationsteknologi; []
    Keywords : ;

    Abstract : The focus of this thesis is on proposing and analyzing a powerful class of codes on graphs---with trellis constraints---that can simultaneously approach capacity and achieve very low error floor. In particular, we propose the concept of spatial coupling for turbo-like code (SC-TC) ensembles and investigate the impact of coupling on the performance of these codes. READ MORE