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Abstract
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Article Information:
An Improved Rate Matching Method for DVB Systems Through Pilot Bit Insertion
Seyed Mohammad-Sajad Sadough and Mohammad Modarresi
Corresponding Author: Seyed Mohammad-Sajad Sadough
Submitted: December 28, 2011
Accepted: March 02, 2012
Published: September 15, 2012 |
Abstract:
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Classically, obtaining different coding rates in turbo codes is achieved through the well known
puncturing procedure. However, puncturing is a critical procedure since the way the encoded sequence is
punctured influences directly the decoding performance. In this work, we propose to mix the data sequence at
the turbo encoder input inside the Digital Video Broadcasting (DVB) standard with some pilot (perfectly
known) bits. By using variable pilot insertion rates, we achieve different coding rates with more flexibility. The
proposed scheme is able to use a less complex mother code compared to that used in a conventional punctured
turbo code. We also analyze the effect of different type of pilot insertion such as random and periodic schemes.
Simulation results provided in the context of DVB show that in addition to providing flexible encoder design
and reducing the encoder complexity, pilot insertion can improve slightly the performance of turbo decoders,
compared to a conventional punctured turbo code.
Key words: Turbo code, puncturing, pilot bit insertion, DVB-SH, BICM, rate matching,
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Cite this Reference:
Seyed Mohammad-Sajad Sadough and Mohammad Modarresi, . An Improved Rate Matching Method for DVB Systems Through Pilot Bit Insertion. Research Journal of Applied Sciences, Engineering and Technology, (18): 3251-3256.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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