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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 1 to 2 of 2 (0.036 seconds)

Spelling suggestions: "subject:"quasicyclic LDPC"" "subject:"alicyclic LDPC""

1

Performance Of Pseudo-random And Quasi-cyclic Low Density Parity Check Codes

Kazanci, Onur Husnu 01 December 2007 (has links) (PDF)
Low Density Parity Check (LDPC) codes are the parity check codes of long block length, whose parity check matrices have relatively few non-zero entries. To improve the performance at relatively short block lengths, LDPC codes are constructed by either pseudo-random or quasi-cyclic methods instead of random construction methods. In this thesis, pseudo-random code construction methods, the effects of closed loops and the graph connectivity on the performance of pseudo-random LDPC codes are investigated. Moreover, quasi-cyclic LDPC codes, which have encoding and storage advantages over pseudo-random LDPC codes, their construction methods and performances are reviewed. Finally, performance comparison between pseudo-random and quasi-cyclic LDPC codes is given for both regular and irregular cases.
2

Low Density Parity Check (LDPC) codes for Dedicated Short Range Communications (DSRC) systems

Khosroshahi, Najmeh 03 August 2011 (has links)
In this effort, we consider the performance of a dedicated short range communication (DSRC) system for inter-vehicle communications (IVC). The DSRC standard employs convolutional codes for forward error correction (FEC). The performance of the DSRC system is evaluated in three different channels with convolutional codes, regular low density parity check (LDPC) codes and quasi-cyclic (QC) LDPC codes. In addition, we compare the complexity of these codes. It is shown that LDPC and QC-LDPC codes provide a significant improvement in performance compared to convolutional codes. / Graduate
Distance Graph
DSRC
DSRC Channel Model
DSRC Physical Layer
DSRC Spectrum
IEEE 802.11a Physical Layer
LDPC
OFDM
Quasi-Cyclic LDPC
Sum Product Algorithm
Tanner Graph
Viterbi Algorithm
WAVE
Wireless Access Vehicular Environment

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