Essays about: "ldpc codes"

Showing result 11 - 15 of 16 essays containing the words ldpc codes.

  1. 11. Source Coding for Erasure Channels

    University essay from KTH/Kommunikationsteori

    Author : Gregory Demay; [2011]
    Keywords : ;

    Abstract : The main goal of this thesis is to bound the rate-distortion performance of the aforementioned sparse-graph codes for lossy compression of a BES. As our main contributions, we first derive lower bounds on the rate-distortion performance of LDGM codes for the BES, which are valid for any LDGM code of a given rate and generator node degree distribution and any encoding function. READ MORE

  3. 12. Root LDPC Codes for Non Ergodic Transmission Channels

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : Tarique Inayat Bhutto; [2011]
    Keywords : Non-Binary Root LDPC codes; LDPC codes; Binary-Root LDPC codes;

    Abstract : 4 ABSTRACT Tremendous amount of research has been conducted in modern coding theory in the past few years and much of the work has been done in developing new coding techniques. Low density parity check (LDPC) codes are class of linear block error correcting codes which provide capacity performance on a large collection of data transmission and storage channels while Root LDPC codes in this thesis work are admitting implementable decoders with manageable complexity. READ MORE

  4. 13. Construction and Performance Evaluation of QC-LDPC Codes over Finite Fields

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : Sohail Noor; Ihsan Ullah; [2010]
    Keywords : Low Density Parity Check LDPC codes; Finite Fields;

    Abstract : Low Density Parity Check (LDPC) codes are one of the block coding techniques that can approach the Shannon’s limit within a fraction of a decibel for high block lengths. In many digital communication systems these codes have strong competitors of turbo codes for error control. READ MORE

  5. 14. Efficient Decoding Algorithms for Low-Density Parity-Check Codes

    University essay from Institutionen för systemteknik

    Author : Anton Blad; [2005]
    Keywords : Electronics; LDPC; Low Density Parity Check; Tanner graph; decoding; sum-product; probability propagation; early decision; threshold; Elektronik;

    Abstract : Low-density parity-check codes have recently received much attention because of their excellent performance and the availability of a simple iterative decoder. The decoder, however, requires large amounts of memory, which causes problems with memory consumption. READ MORE

  6. 15. Efficient Message Passing Decoding Using Vector-based Messages

    University essay from Institutionen för systemteknik

    Author : Mikael Grimnell; Mats Tjäder; [2005]
    Keywords : Forward Error Correction; Low Density Parity Check Codes; Message Passing Decoding; Belief Propagation; Extrinsic Information Transfer; Galois Fields; Phase Shift Keying;

    Abstract : The family of Low Density Parity Check (LDPC) codes is a strong candidate to be used as Forward Error Correction (FEC) in future communication systems due to its strong error correction capability. Most LDPC decoders use the Message Passing algorithm for decoding, which is an iterative algorithm that passes messages between its variable nodes and check nodes. READ MORE