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Joint interleaver design for multiple turbo codes


Joint interleaver design for multiple turbo codes

Ehtiati, Neda (2004) Joint interleaver design for multiple turbo codes. Masters thesis, Concordia University.

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The outstanding performance of turbo codes at low signal-to-noise ratio is deteriorated in the error-floor region, due to the low values of the free distance of turbo codes. Interleaver design for turbo codes can improve the minimum distance of the code, by eliminating low-weight input sequences that result in low-weight codewords. Interleaver can also be designed to improve the performance of the sub-optimal iterative decoding methods. While the relating criteria to satisfy these conditions are known, we are not able to find an interleaver that fulfills all these conditions in reasonable time. In this thesis, we have proposed a Joint interleaver design methods , for multiple turbo codes, where we have at least three constituent codes and two interleavers to design. In our proposed methods each interleaver is designed to satisfy some of the conditions and the other conditions are satisfied by the other interleaver. This will decrease the load on one interleaver to satisfy all the conditions at the same time and enable us to satisfy tougher conditions. It is shown that the proposed Sequential joint interleaver design converges very fast and can satisfy very tough conditions, which means better performance at error-floor region of the turbo code.

Divisions:Concordia University > Faculty of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Thesis (Masters)
Authors:Ehtiati, Neda
Pagination:xii, 120 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Electrical and Computer Engineering
Thesis Supervisor(s):Solevmani, M. R
ID Code:7892
Deposited By: Concordia University Libraries
Deposited On:18 Aug 2011 18:09
Last Modified:19 Aug 2011 08:05
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